Every presidential election since 1876.
The long record is the point. Every place page carries the full presidential series from 1876 to 2024 — not the last two cycles, not one viral map, but the whole arc, on every county, district, metro, and town in the atlas.
- 38
- elections
- 148
- years of results
- 3,143
- counties
- 2008–2024
- block-level era
The series is compiled from the MIT Election Lab county-level data, the ICPSR historical archive, and precinct-level returns from VEST, with 2024 totals taken from each state’s certified results rather than newswire tallies. Every figure on every page traces to one of those named sources.
The length changes what you can see. Cobb County, GA voted Republican in every presidential election from 1980 through 2012, then flipped Democratic in 2016 and has stayed there since. McDowell County, WV voted Democratic for seventy-two years, then stopped. Neither story is visible in a two-cycle dataset; both are plain in this one.
In the modern era the atlas goes below the county. Precinct returns are disaggregated to census blocks and re-summed inside whatever boundary the page describes — so a congressional district that crosses county lines gets exact totals, and a city is measured separately from the county around it, for every election from 2008 through 2024. County pages render the precinct map itself, with the underlying geometry on the page.
Margins are computed one way everywhere — the Democratic share minus the Republican share of the total vote, written D+N.N or R+N.N to one decimal place. Gaps in the historical record render as gaps, never interpolations: about 60% of county-year combinations before 1928 have no recorded result, and the table says so. Suppressed census estimates render as not reported, never as zero. The methodology page documents every known quirk in the record, from Alaska’s ranked-choice residual to Connecticut’s planning-region switchover.