USA Votes Data Lab Newsroom

2024 EAVS × 2020–2024 ACS

County Voting Atlas

See the machinery behind an election: how mail ballots move, what local offices report, and which far-apart counties share the same community profile.

3,105 matched counties

152.9M reported voters

47.4M returned mail ballots

County measure

Mail-ballot journey

Reported ballot stages; missing stages are not estimated.

Original combinations

Questions that election results alone cannot answer

Open all data stories
01The twin-county gapSimilar communities, different administration 02Car-free access mismatchVehicle access × polling-place density 03Mail-ballot frictionVolume-filtered rates and reasons 04Turnout × infrastructureOne correlation, four county groups

Ballot DNA

What happened below the presidential line?

Anonymous cast-vote records reveal whether presidential voters stayed with one party in contested down-ballot races, crossed over completely, or assembled a mixed ballot.

2.39%strict cross-party paths in the represented 2020 records
Explore all 20 represented states
Biden presidential ballots73.0%all Democratic below24.5%mixed2.5%all Republican below
Trump presidential ballots2.2%all Democratic below16.4%mixed81.4%all Republican below

Based on 42,710,448 anonymized presidential ballots in the MIT Election Data and Science Lab CVR release 3.0. Coverage, not a national sample.

49 state hubs

Move from a national pattern to a state system

Browse every state hub

From the newsroom

All election news