Consecutive-election opposite-party landslide counties in 2000 and 2016
1996: 51.7%-34.2% (margin: 17.6%/596 votes)
2000: 54.7%-41.1% (margin: 13.6%/403 votes)
1996: 52.66%-37.59% (margin: 15.07%/1,354 votes)
2000: 53.92%-43.01% (margin: 10.91%/1,015 votes)
1996: 53.25%-34.77% (margin: 18.48%/1,023 votes)
2000: 54.63%-42.16% (margin: 12.47%/750 votes)
1996: 47.89%-37.07% (margin: 10.82%/866 votes)
2000: 55.42%-40.55% (margin: 14.87%/1,204 votes)
1996: 50.13%-39.95% (margin: 10.18%/1,635 votes)
2000: 59.11%-38.18% (margin: 20.93%/3,755 votes)
1996: 52.89%-32.86% (margin: 20.03%/693 votes)
2000: 56.91%-38.46% (margin: 18.45%/690 votes)
1996: 53.79%-32.83% (margin: 20.96%/730 votes)
2000: 52.76%-41.13% (margin: 11.63%/466 votes)
1996: 55.41%-32.86% (margin: 22.54%/961 votes)
2000: 57.29%-40.39% (margin: 16.90%/671 votes)
1996: 52.57%-33.19% (margin: 19.39%/833 votes)
2000: 60.26%-36.27% (margin: 23.99%/955 votes)
1996: 50.15%-34.36% (margin: 15.78%/701 votes)
2000: 53.97%-42.04% (margin: 11.93%/580 votes)
1996: 52.53%-37.97% (margin: 14.55%/2,320 votes)
2000: 55.40%-40.11% (margin: 15.29%/2,386 votes)
1996: 52.25%-39.74% (margin: 12.50%/426 votes)
2000: 57.78%-41.56% (margin: 16.22%/640 votes)
1996: 52.68%-42.39% (margin: 10.29%/413 votes)
2000: 57.34%-41.12% (margin: 16.22%/843 votes)
1996: 52.95%-36.14% (margin: 16.81%/379 votes)
2000: 62.33%-36.94% (margin: 25.39%/732 votes)
1996: 54.46%-34.55% (margin: 19.91%/299 votes)
2000: 55.04%-43.70% (margin: 11.34%/216 votes)
1996: 51.29%-39.47% (margin: 11.82%/358 votes)
2000: 57.44%-41.54% (margin: 15.90%/532 votes)
1996: 50.07%-26.67% (margin: 23.40%/1,393 votes)
2000: 53.46%-41.32% (margin: 12.14%/654 votes)
1996: 49.72%-37.19% (margin: 12.53%/565 votes)
2000: 54.92%-42.36% (margin: 12.56%/576 votes)
1996: 48.59%-36.78% (margin: 11.81%/565 votes)
2000: 55.3%-43.2% (margin: 12.1%/510 votes)
1996: 47.62%-37.24% (margin: 10.38%/606 votes)
2000: 56.6%-41.3% (margin: 15.3%/961 votes)
1996: 50.51%-39.64% (margin: 10.87%/355 votes)
2000: 55.1%-43.0% (margin: 12.1%/366 votes)
1996: 50.7%-35.7% (margin: 15.0%/351 votes)
2000: 54.70%-42.66% (margin: 12.04%/296 votes)
1996: 50.7%-37.2% (margin: 13.5%/1,861 votes)
2000: 55.15%-42.84% (margin: 12.31%/1,752 votes)
1996: 51.0%-38.1% (margin: 12.9%/466 votes)
2000: 55.17%-43.44% (margin: 11.73%/472 votes)
1996: 49.0%-38.3% (margin: 10.7%/798 votes)
2000: 58.64%-39.64% (margin: 19.00%/1,723 votes)
1996: 51.3%-40.8% (margin: 10.5%/563 votes)
2000: 54.41%-44.35% (margin: 10.06%/586 votes)
1996: 51.41%-38.64% (margin: 12.76%/3,054 votes)
2000: 59.45%-38.26% (margin: 21.18%/4,922 votes)
1996: 51.91%-37.02% (margin: 14.89%/4,378 votes)
2000: 54.53%-43.40% (margin: 11.13%/3,433 votes)
1996: 50.70%-32.91% (margin: 17.79%/738 votes)
2000: 61.99%-34.31% (margin: 27.68%/1,158 votes)
1996: 52.11%-34.26% (margin: 17.85%/922 votes)
2000: 61.11%-36.05% (margin: 25.06%/1,194 votes)
1996: 53.55%-37.10% (margin: 16.46%/1,109 votes)
2000: 53.88%-43.32% (margin: 10.56%/663 votes)
1996: 52.38%-35.96% (margin: 16.42%/1,431 votes)
2000: 54.44%-41.99% (margin: 12.45%/1,058 votes)
1996: 52.83%-35.53% (margin: 17.30%/2,569 votes)
2000: 53.56%-42.34% (margin: 11.22%/1,527 votes)
1996: 50.35%-40.09% (margin: 10.26%/3,073 votes)
2000: 57.42%-39.18% (margin: 18.23%/5,474 votes)
1996: 53.29%-33.31% (margin: 19.98%/2,586 votes)
2000: 55.36%-41.14% (margin: 14.21%/1,783 votes)
1996: 52.84%-34.01% (margin: 18.84%/6,705 votes)
2000: 53.92%-42.46% (margin: 11.46%/3,948 votes)
1996: 51.02%-38.35% (margin: 12.67%/4,606 votes)
2000: 58.12%-39.30% (margin: 18.81%/6,900 votes)
1996: 55.64%-33.77% (margin: 21.87%/4,956 votes)
2000: 56.20%-39.15% (margin: 17.05%/3,791 votes)
1996: 55.31%-35.13% (margin: 20.18%/3,535 votes)
2000: 55.12%-42.11% (margin: 13.01%/2,223 votes)
1996: 50.64%-37.56% (margin: 13.08%/976 votes)
2000: 63.32%-34.07% (margin: 29.26%/1,861 votes)
1996: 48.69%-31.56% (margin: 17.13%/1,528 votes)
2000: 52.3%-40.5% (margin: 11.8%/1,100 votes)
1996: 48.60%-36.70% (margin: 11.90%/392 votes)
2000: 54.11%-41.26% (margin: 12.85%/436 votes)
1996: 48.43%-38.03% (margin: 10.40%/1,206 votes)
2000: 54.02%-43.12% (margin: 10.90%/1,399 votes)
1996: 48.98%-35.86% (margin: 13.12%/557 votes)
2000: 59.55%-36.47% (margin: 23.08%/958 votes)
1996: 47.01%-35.56% (margin: 11.44%/1,103 votes)
2000: 51.72%-41.25% (margin: 10.48%/1,118 votes)
1996: 47.57%-35.99% (margin: 11.58%/685 votes)
2000: 53.48%-38.89% (margin: 14.59%/922 votes)
1996: 50.00%-33.00% (margin: 17.00%/358 votes)
2000: 52.15%-39.71% (margin: 12.44%/260 votes)
1996: 51.39%-37.40% (margin: 13.99%/564 votes)
2000: 55.37%-43.14% (margin: 12.13%/508 votes)
1996: 47.92%-36.76% (margin: 11.16%/469 votes)
2000: 53.50%-43.09% (margin: 10.41%/470 votes)
1996: 50.42%-34.21% (margin: 16.21%/756 votes)
2000: 56.25%-41.80% (margin: 14.45%/632 votes)
1996: 55.10%-30.51% (margin: 24.59%/728 votes)
2000: 56.28%-41.46% (margin: 14.82%/464 votes)
1996: 47.01%-36.70% (margin: 10.31%/217 votes)
2000: 61.27%-36.26% (margin: 25.01%/545 votes)
1996: 49.58%-35.27% (margin: 14.30%/543 votes)
2000: 59.38%-37.82% (margin: 21.56%/815 votes)
1996: 48.75%-38.45% (margin: 10.30%/582 votes)
2000: 57.22%-40.82% (margin: 16.40%/959 votes)
1996: 48.8%-34.2% (margin: 14.6%/355 votes)
2000: 59.85%-35.73% (margin: 24.12%/474 votes)
1996: 46.07%-35.12% (margin: 10.96%/254 votes)
2000: 53.5%-40.0% (margin: 13.5%/311 votes)
1996: 47.54%-36.42% (margin: 11.12%/149 votes)
2000: 55.79%-38.54% (margin: 17.25%/137 votes)
1996: 49.24%-37.78% (margin: 11.46%/279 votes)
2000: 54.73%-39.72% (margin: 15.01%/408 votes)
1996: 50.61%-39.67% (margin: 10.94%/134 votes)
2000: 54.13%-39.26% (margin: 14.88%/180 votes)
1996: 48.85%-34.77% (margin: 14.07%/677 votes)
2000: 54.99%-41.18% (margin: 13.81%/683 votes)
1996: 52.16%-35.26% (margin: 16.90%/739 votes)
2000: 54.93%-44.08% (margin: 10.85%/469 votes)
1996: 49.26%-35.96% (margin: 13.31%/335 votes)
2000: 59.80%-38.99% (margin: 20.81%/448 votes)
1996: 54.94%-33.76% (margin: 21.18%/281 votes)
2000: 57.43%-42.07% (margin: 15.36%/185 votes)
1996: 49.93%-36.79% (margin: 13.15%/481 votes)
2000: 57.33%-41.80% (margin: 15.53%/520 votes)
1996: 53.77%-38.34% (margin: 15.44%/1,552 votes)
2000: 54.47%-44.03% (margin: 10.44%/1,106 votes)
1996: 49.63%-38.35% (margin: 11.28%/168 votes)
2000: 57.19%-41.31% (margin: 15.88%/201 votes)
1996: 50.45%-37.99% (margin: 12.46%/540 votes)
2000: 54.91%-41.73% (margin: 13.18%/537 votes)
1996: 52.21%-40.63% (margin: 11.58%/424 votes)
2000: 56.05%-42.94% (margin: 13.11%/496 votes)
1996: 52.50%-37.51% (margin: 14.99%/1,625 votes)
2000: 57.13%-41.91% (margin: 15.22%/1,677 votes)
1996: 54.16%-37.59% (margin: 16.57%/996 votes)
2000: 56.68%-42.29% (margin: 14.39%/822 votes)
1996: 50.49%-36.31% (margin: 14.17%/73 votes)
2000: 64.55%-34.51% (margin: 30.04%/161 votes)
1996: 51.07%-38.97% (margin: 12.10%/186 votes)
2000: 60.09%-39.15% (margin: 20.94%/330 votes)
1996: 51.13%-39.90% (margin: 11.23%/850 votes)
2000: 56.91%-41.47% (margin: 15.44%/1,277 votes)
1996: 50.44%-39.46% (margin: 10.98%/264 votes)
2000: 66.36%-32.52% (margin: 33.84%/871 votes)
1996: 51.24%-39.06% (margin: 12.18%/556 votes)
2000: 56.54%-42.66% (margin: 13.88%/722 votes)
1996: 54.03%-36.39% (margin: 17.64%/628 votes)
2000: 55.61%-43.00% (margin: 12.61%/480 votes)
1996: 53.11%-35.22% (margin: 17.88%/164 votes)
2000: 62.08%-36.80% (margin: 25.28%/202 votes)
1996: 52.24%-38.76% (margin: 13.48%/716 votes)
2000: 58.39%-40.44% (margin: 17.95%/951 votes)
1996: 53.05%-41.10% (margin: 11.94%/1,266 votes)
2000: 54.24%-44.06% (margin: 10.18%/1,167 votes)
1996: 45.73%-33.44% (margin: 12.29%/301 votes)
2000: 54.1%-39.0% (margin: 15.1%/435 votes)
1996: 50.33%-33.71% (margin: 16.61%/305 votes)
2000: 52.36%-40.70% (margin: 11.66%/230 votes)
1996: 50.9%-35.6% (margin: 15.3%/921 votes)
2000: 56.37%-41.37% (margin: 15.006%/908 votes)
1996: 51.5%-36.7% (margin: 14.8%/402 votes)
2000: 54.49%-42.52% (margin: 11.97%/313 votes)
1996: 52.5%-35.2% (margin: 17.3%/457 votes)
2000: 56.93%-39.85% (margin: 17.08%/468 votes)
1996: 51.6%-35.7% (margin: 15.9%/554 votes)
2000: 56.82%-40.15% (margin: 16.67%/578 votes)
1996: 54.2%-33.2% (margin: 21.0%/2,121 votes)
2000: 55.00%-42.21% (margin: 13.79%/1,220 votes)
1996: 48.7%-35.7% (margin: 13.0%/715 votes)
2000: 54.69%-43.29% (margin: 11.40%/651 votes)
1996: 49.8%-36.8% (margin: 13.0%/432 votes)
2000: 57.83%-39.42% (margin: 18.41%/616 votes)
2016
Fulton, IL
2012: 54.04%-43.03% (margin: 11.01%/1,696 votes)
2016: 54.28%-39.20% (margin: 15.08%/2,359 votes)
Henderson, IL
2012: 55.44%-43.19% (margin: 12.25%/437 votes)
2016: 61.80%-33.12% (margin: 28.68%/1,000 votes)
Perry, IN
2012: 54.81%-43.21% (margin: 11.60%/913 votes)
2016: 56.56%-38.01% (margin: 18.55%/1,494 votes)
Buchanan, IA
2012: 56.11%-42.24% (margin: 13.87%/1,461 votes)
2016: 53.75%-38.72% (margin: 15.03%/1,540 votes)
Chickasaw, IA
2012: 54.81%-43.74% (margin: 11.07%/718 votes)
2016: 58.15%-35.21% (margin: 22.94%/1,476 votes)
Fayette, IA
2012: 55.30%-43.33% (margin: 11.97%/1,240 votes)
2016: 56.34%-36.98% (margin: 19.36%/1,931 votes)
Floyd, IA
2012: 56.68%-42.05% (margin: 14.63%/1,208 votes)
2016: 54.28%-39.44% (margin: 14.84%/1,196 votes)
Howard, IA
2012: 59.59%-38.64% (margin: 20.95%/973 votes)
2016: 57.27%-36.78% (margin: 20.49%/934 votes)
Jackson, IA
2012: 57.67%-40.78% (margin: 16.89%/1,730 votes)
2016: 56.49%-37.22% (margin: 19.27%/1,951 votes)
Lee, IA
2012: 56.65%-41.17% (margin: 15.48%/2,929 votes)
2016: 54.50%-38.48% (margin: 16.02%/2,588 votes)
Wapello, IA
2012: 54.93%-43.05% (margin: 11.88%/1,874 votes)
2016: 57.53%-36.93% (margin: 20.60%/3,121 votes)
Worth, IA
2012: 56.33%-41.80% (margin: 14.53%/606 votes)
2016: 57.62%-35.94% (margin: 21.68%/923 votes)
Oxford, ME
2012: 54.30%-39.89% (margin: 14.41%/4,334 votes)
2016: 51.95%-39.01% (margin: 12.94%/4,038 votes)
Freeborn, MN
2012: 55.82%-41.72% (margin: 14.10%/2,357 votes)
2016: 54.88%-37.64% (margin: 17.24%/2,767 votes)
Norman, MN
2012: 53.94%-43.16% (margin: 10.78%/346 votes)
2016: 52.10%-38.76% (margin: 13.34%/435 votes)
Cayuga, NY
2012: 54.56%-43.16% (margin: 11.40%/3,553 votes)
2016: 52.41%-40.76% (margin: 11.65%/3,862 votes)
Ransom, ND
2012: 55.37%-41.62% (margin: 13.75%/333 votes)
2016: 51.29%-35.52% (margin: 15.77%/372 votes)
Ashtabula, OH
2012: 55.10%-42.36% (margin: 12.74%/5,505 votes)
2016: 56.62%-37.83% (margin: 18.79%/7,741 votes)
Essex, VT
2012: 55.00%-41.60% (margin: 13.40%/375 votes)
2016: 51.5%-34.8% (margin: 16.7%/487 votes)
Covington City, VA
2012: 56.61%-41.85% (margin: 14.76%/344 votes)
2016: 56.63%-38.37% (margin: 18.26%/435 votes)
Jackson, WI
2012: 56.89%-41.88% (margin: 15.01%/1,398 votes)
2016: 52.94%-41.20% (margin: 11.74%/1,088 votes)
Trempealeau, WI
2012: 56.41%-42.33% (margin: 14.08%/1,898 votes)
2016: 53.82%-41.18% (margin: 12.64%/1,730 votes)
22 counties in 11 states, whereof Iowa contained 9, and no other state had more than two.
13 of these counties gave both Obama in 2012 and Trump in 2016 raw vote pluralities of at least 1,000 votes; they were in these states, with Iowa having six, Wisconsin, two, and no other state having more than one. Ashtabula, OH, which gave the largest raw vote margins to both nominees of these counties, cast 43,200 votes in 2012; amongst other counties giving both nominees raw vote pluralities of over 2,000 votes, Lee, IA cast 18,911 votes in 2012; Oxford, ME, 30,074; Freeborn, MN, 16,706; and Cayuga, NY, 31,169.
Ransom, ND and Essex, VT were consecutive-election opposite-party landslide counties in both 2000 and 2016.
2008
Bush '04-Obama '08
Kane, IL
2004: 54.95%-44.21% (margin: 10.74%/18,437 votes)
2008: 55.23%-43.44% (margin: 11.79%/22,793 votes)
Delaware, IN
2004: 56.5%-42.6% (margin: 13.9%/6,628 votes)
2008: 57.0%-41.9% (margin: 15.1%/7,468 votes)
Tippecanoe, IN
2004: 59.0%-39.8% (margin: 19.2%/10,079 votes)
2008: 55.2%-43.6% (margin: 11.6%/7,959 votes)
Essex, VT
2004: 54.2%-43.4% (margin: 10.8%/315 votes)
2008: 55.89%-41.41% (margin: 14.48%/449 votes)
Harrisonburg City, VA
2004: 55.9%-42.8% (margin: 13.1%/1,439 votes)
2008: 57.54%-41.21% (margin: 16.33%/2,396 votes)
Manassas City, VA
2004: 56.2%-43.1% (margin: 13.1%/1,695 votes)
2008: 55.17%-43.85% (margin: 11.32%/1,543 votes)
Kerry-McCain
Jackson, AR
2004: 56.5%-42.2% (margin: 14.3%/891 votes)
2008: 55.86%-39.54% (margin: 16.32%/911 votes)
Grundy, TN
2004: 56.6%-42.7% (margin: 13.9%/682 votes)
2008: 55.33%-42.55% (margin: 12.78%/592 votes)
Mingo, WV
2004: 56.2%-43.3% (margin: 12.9%/1,371 votes)
2008: 55.0%-43.0% (margin: 12.0%/1,005 votes)
There were a few unusual features of the consecutive-election opposite-party landslide counties in 2008 (although I don't know how unusual they are historically). First of all, there were consecutive-election opposite-party landslide counties that flipped in both directions in 2008, unlike in any other election this century.
Also, every consecutive-election opposite-party landslide county in every election in the 21st century voted for the party it was switching to when it was an consecutive-election opposite-party landslide county, in 2020--except for Delaware County, Indiana (well, and Essex County, Vermont, which could not have helped but not do so in 2020 since it had been an consecutive-election opposite-party landslide county for both parties in the 21st century). (In Val Verde County's case, this required the county to flip against the national trend in 2020.)
Delaware County--home to Muncie--isn't even particularly tenuously Republican (as, say, Ada County, Idaho has been since the Bush years). Trump won it with 55.7% of the vote in 2020. This was up from 53.3% in 2016--a greater improvement than Trump experienced nationally. It was also the second-highest Republican vote share in the county this century, after just Bush's in 2004.
There's no clear candidate for a 'Howard County, Iowa' in 2008. For the most part, people were wowed by Obama's pickup of a large number of large, suburban Republican counties, even though--aside from Kane (the only consecutive-election opposite-party landslide county in the 21st century that cast over 100,000 votes)--none of them voted for Bush by over 10% in 2004 and for Obama by over 10% in 2008. And Kane, of course, was not in a state Obama flipped.
Manassas might be the most natural choice for a 'Howard County' in 2008. It is the seat of the future Romney must-win county of Prince William (although it is not part of said county), and was in one of the well-educated, historically Republican states Obama flipped in 2008 (and which would go on to be either permanently blue or permanently purple). Harrisonburg, which is in the Shenandoah Valley (and is the county seat of Rockingham County, which has consistently become of the Republicans' five or so best raw vote margin counties in the state), doesn't fit as obviously into the narrative of the 2008 election.
Delaware County, however, is perhaps the most interesting consecutive-election opposite-party landslide county in 2008. It showcases another, generally neglected side of the Obama coalition, and perhaps largely explains why Obama's carriage of Indiana turned out to be a fluke. (Obama actually carried Delaware County again in 2012, but by the much-reduced margin of 3.1%.)
Meanwhile, amid a decisive national win, three landslide Kerry counties turning around to give McCain landslide victories--all in 'Greater Appalachia'--might have served to bear out Michael Barone's and Sean Wilentz's warnings about the future of the Democracy in these areas under an Obama candidacy. Mingo County, in particular, might have borne out Hillary Clinton's primary-season warning about the importance of West Virginia to Democratic presidential nominees.
---
2004, 2012, and 2020
These were three elections in which there were relatively few consecutive-election opposite-party landslide counties. In two of them, the in-party stayed in power.
In 2004, there were three consecutive-election opposite-party landslide counties, all of them Gore '00-Bush '04 counties in 'Greater Appalachia':
Haskell, OK
2000: 54.2%-44.1% (margin: 10.1%/471 votes)
2004: 55.3%-44.7% (margin: 10.6%/568 votes)
Marshall, TN
2000: 54.6%-43.9% (margin: 10.7%/1,002 votes)
2004: 54.9%-44.5% (margin: 10.4%/1,103 votes)
Wyoming, WV
2000: 54.4%-44.1% (margin: 10.3%/816 votes)
2004: 57.2%-42.4% (margin: 14.8%/1,291 votes)
Even though Marshall, TN was the only one that gave both Gore and Bush raw vote pluralities of over 1,000 votes, Wyoming might have stolen the show amongst these as being in a state whose traditionally Democratic character was certainly still in recent memory and which Democrats hadn't anything like given up on yet.
In 2012, there were two consecutive-election opposite-party landslide counties:
Gallatin, IL
2008: 55.3%-42.2% (margin: 13.1%/375 votes)
2012: 58.0%-40.0% (margin: 18.0%/463 votes)
Boone, WV
2008: 54.1%-43.4% (margin: 10.7%/897 votes)
2012: 64.3%-32.8% (margin: 31.5%/2,677 votes)
This was the only election in the 20th century in which the Republican was trying to take the presidency back for his party and failed, and his number of consecutive-election opposite-party landslide counties compares rather unfavourably with the numbers in the other two such elections, where the Republican was successful (88 in 2000, 22 in 2016). Furthermore, neither of Romney's consecutive-election opposite-party landslide counties was in a state he flipped or which was even remotely competitive.
That said, Romney did have an consecutive-election opposite-party landslide county (or two), whereas Kerry and Biden had none.
Both of 2012's consecutive-election opposite-party landslide counties were in the broader 'Scots-Irish zone' (Gallatin County was one of the 14 counties in Illinois to vote for Hillary Clinton in the 2008 primary--counties whereof Barone wrote, 'all of them originally settled by southerners—more Jacksonian country'). This was arguably one of the markers of the culmination of the Southern Strategy, as, with perhaps one possible exception, none of Trump's consecutive-election opposite-party landslide counties was in the South or South-adjacent parts of the country. (Fulton and Henderson Counties, IL are in the northern half of the state--albeit not very far past halfway up the state--and both voted for Obama in the 2008 primary.) (The one possible exception is Perry County, Indiana, which is across the Ohio River from Kentucky, which voted for John Davis in 1924, and which--like all but nine or ten of Indiana's counties--voted for Hillary Clinton in the state's 2008 primary [which she won by just 1.12%].)
Boone County might have served as a final putting-to-rest of any possible lingering ideas that the Democracy might be able to recapture West Virginia (which had not been written off in either 2004 or 2008).
In 2020, there was only one consecutive-election opposite-party landslide county, a very small Hillary '16-Trump '20 county in Texas' Rio Grande Valley:
La Salle, TX
2016: 54.8%-42.4% (margin: 12.4%/257 votes)
2020: 55.5%-43.7% (margin: 11.8%/283 votes)
This indicates a few interesting things, however.
It means that Biden is the first nominee to take the presidency back for his party in over 100 years without flipping a consecutive-election opposite-party landslide county.*
It also means that Trump lost re-election despite carrying a consecutive-election opposite-party landslide county (I don't know whether this is a rare occurrence historically).
It also means that Republicans have carried at least one consecutive-election opposite-party landslide county in six straight elections (at least--although I'd guess Bob Dole didn't flip any in 1996), whereas Democrats have carried at least one such county in only one of the past six elections. (Again, I don't know how historically unusual either of these is.)
In any case, it means that, unlike in 2000, 2008, or 2016, there is no 'Howard County' in 2020--at least, not for the victor.
(Zapata County--which is somewhat larger than La Salle and saw a truly enormous swing of 38.3% [almost as big as Howard County's swing in 2016]--has perhaps been treated as 2020's 'Howard County' more than La Salle. Either way, it's a Hillary '16-Trump '20 county.)
Kerry--who was also trying to unseat a narrowly-elected Republican president and, in his case, fell just short--also had no consecutive-election opposite-party landslide counties, of course. Arguably, however, Kerry came closer to having such than Biden did. These were Biden's margins in the two counties he flipped that had voted for Trump by at least 10% in 2016:
Inyo, CA
2016: 51.94%-38.57% (margin: 13.37%/1,093 votes)
2020: 48.86%-48.71% (margin: 0.15%/34 votes)
Talbot, MD
2016: 52.2%-42.1% (margin: 10.1%/2,071 votes)
2020: 49.0%-48.5% (margin: 0.5%/116 votes)
If we keep going down the list of the counties Biden flipped, ordered by how large their percent margin for Trump was in 2016, it's not until Stafford that we get to a county in which Biden won a majority:
Williamson, TX
2016: 50.9%-41.3% (margin: 9.6%/19,707 votes)
2020: 49.6%-48.2% (margin: 1.4%/4,066 votes)
Stafford, VA
2016: 51.4%-42.3% (margin: 9.1%/5,960 votes)
2020: 50.5%-47.3% (margin: 3.2%/2,609 votes)
In contrast, this was how Kerry won the two counties he flipped that had voted for Bush in 2000 by over 10% and by over 1,000 votes:
Teton, WY
2000: 52.3%-38.5% (margin: 13.8%/1,435 votes)
2004: 52.6%-45.1% (margin: 7.5%/848 votes)
La Plata, CO
2000: 48.8%-38.4% (margin: 10.4%/2,129 votes)
2004: 52.6%-45.9% (margin: 6.7%/1,705 votes)
Kerry may not have won either of these by 10%, but he won them by significantly larger margins than Biden won any county Trump had carried by over 10% in 2016; and he won majorities in both of them.
In fact, Kerry won Roberts County, SD (a county that Bush had carried by over 10% but by fewer than 1,000 votes in 2000) by more raw votes than Biden won either Inyo or Talbot County by:
Roberts, SD
2000: 54.9%-41.7% (margin: 13.2%/537 votes)
2004: 50.7%-48.1% (margin: 2.6%/131 votes)
(Also winning a majority in the county.)
Even though Trump didn't win Zapata County by double digits, he did win a majority in the county (unlike Biden in Inyo or Talbot), and won it by a larger percent margin than Biden won any county Trump had carried by more than 5% in 2016. (Biden's largest margin in a county that had voted for Trump by over 5% in 2016 was 4.8% [51.5%-46.7%] in James City County.) Trump also won Zapata by more raw votes than Biden won Talbot by:
Zapata, TX
2016: 65.7%-32.8% (margin: 32.9%/1,034 votes)
2020: 52.5%-47.1% (margin: 5.4%/207 votes)
* This is an example of a consecutive-election opposite-party landslide county in every election in the past 100 years in which the out-party won the presidency. These aren't necessarily the best examples for each election; they were ones that were relatively easy to find given pre-existing knowledge about each election.
1992:
Campbell, TN
1988: 55.19%-44.48% (margin: 10.72%/1,009 votes)
1992: 52.25%-37.87% (margin: 14.38%/1,859 votes)
1980:
Spotsylvania, VA
1976: 55.69%-42.46% (margin: 13.23%/1,000 votes)
1980: 53.82%-40.37% (margin: 13.45%/1,346 votes)
1976:
Duval, FL
1972: 72.19%-27.50% (margin: 44.69%/75,624 votes)
1976: 58.01%-41.08% (margin: 16.93%/30,915 votes)
1968:
Caledonia, VT
1964: 63.8%-36.2% (margin: 27.6%/2,474 votes)
1968: 58.9%-37.7% (margin: 21.2%/1,795 votes)
1960:
Worcester, MA
1956: 60.10%-39.68% (margin: 20.42%/55,512 votes)
1960: 60.46%-39.37% (margin: 21.09%/60,373 votes)
1952:
Shasta, CA
1948: 56.9%-39.7% (margin: 17.2%/2,167 votes)
1952: 56.4%-42.9% (margin: 13.5%/2,417 votes)
(Shasta was also a consecutive-election opposite-party landslide county in 1956, for Adlai Stevenson.)
1932:
Butte, CA
1928: 60.5%-37.8% (margin: 22.7%/2,360 votes)
1932: 65.0%-29.1% (margin: 35.1%/5,323 votes)
1920:
Ward, ND
1916: 56.7%-35.4% (margin: 21.3%/1,048 votes)
1920: 67.4%-25.1% (margin: 42.3%/3,875 votes)
There was also at least one in 1948 (when Dewey nearly reclaimed the presidency for his party):
1948:
Pinellas, FL
1944: 57.72%-42.28% (margin: 15.44%/5,234 votes)
1948: 55.92%-35.32% (margin: 20.60%/9,176 votes)
And at least one in each of the elections in the second half of the 20th century in which a Democrat unsuccessfully tried to retake the presidency for his party:
1956:
Shasta, CA
1952: 56.4%-42.9% (margin: 13.5%/2,417 votes)
1956: 55.8%-43.8% (margin: 12.0%/2,406 votes)
1972:
Pitkin, CO
1968: 56.2%-36.0% (margin: 20.2%/407 votes)
1972: 54.2%-44.2% (margin: 10.0%/467 votes)
(McGovern's margin in Pitkin was exactly 10%.)
1984:
Apache, AZ
1980: 56.6%-37.0% (margin: 19.6%/2,074 votes)
1984: 55.8%-43.3% (margin: 12.5%/1,639 votes)
1988:
Bastrop, TX
1984: 57.38%-42.28% (margin: 15.11%/1,695 votes)
1988: 56.80%-42.51% (margin: 14.28%/2,013 votes)
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