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These are the counties Republicans have won by quadrant-major margins in from 1932 on (except in 1972). Again, the lists are continuations from the ones given here .  Herbert Hoover, 1932 (9,937.9745) ... Chautauqua, NY (13,565) ( 60.6% - 33.6% ) Bergen, NJ (12,964) ( 52.42% - 44.60% ) Monroe, NY (12,756) ( 51.60% - 44.75% ) Cumberland, ME (12,209) ( 60.82% - 38.23% ) Plymouth, MA (11,592) ( 57.39% - 39.76% ) Morris, NJ (11,364) ( 59.17% - 37.81% ) Westchester, NY (11,312) ( 51.07% - 45.94% ) Middlesex, MA (10,229) ( 50.45% - 47.65% ) Lancaster, PA (10,096) ( 56.54% - 39.997% ) Niagara, NY (10,087) ( 58.33% - 39.26% ) Erie, NY (10,047) ( 49.86% - 46.31% ) St Lawrence, NY (9,963) ( 63.48% - 35.56% ) Broome, NY (9,949) ( 57.97% - 40.36% ) Alf Landon, 1936 (11,411.92475) Norfolk, MA (24,775) ( 55.44% - 38.80% ) Nassau, NY (20,736) ( 54.97% - 42.96% ) Onondaga, NY (17,553) ( 55.0% - 43.0% ) Suffolk, NY (15,892) ( 58.07% - 39.22% ) St Lawrence, NY (13,268) ( 65.8% - 32.3% ) Oswego, ...

Here , we defined a 'major margin' as one representing 0.1% of the national popular vote. This is a helpful definition, and one that roughly captures the idea of a '100,000-vote margin' (but in a way that is translatable across time).  However, it is a very rarefied margin as well, and often fails to show some interesting phenomena.  In 2015, Steve Schale noted that ' The Democratic path to victory [in Florida] means running up the score in a few counties, where the Republican path means winning several counties by 30-50K votes.' He thereby suggests perhaps a secondary threshold for a substantial county raw vote margin. In the most recent election at the time (which he directly references)--2012--0.025% of the national vote was 32,271.3525 votes. This would be a 'quadrant-major margin'.  Here are the counties Democrats have won by quadrant-major margins since the New Deal (except in the landslide elections of 1932, 1936, and 1964). There are a lot ...