{
  "dataset_name": "US Presidential Election Results by County",
  "source": "MIT Election Data + Science Lab / Dave Leip Atlas",
  "last_updated": "2026-02-10",
  "files": {
    "2016_election.csv": "County-level 2016 presidential results with vote counts and margins",
    "2020_election.csv": "County-level 2020 presidential results with vote counts and margins"
  },
  "key_fields": {
    "fips": "5-digit FIPS county code",
    "county": "County name",
    "state": "State name",
    "total_votes": "Total ballots cast",
    "dem_votes": "Democratic candidate votes",
    "rep_votes": "Republican candidate votes"
  },
  "record_count": "~3,100 counties per election",
  "notes": "Mergeable with other FIPS-keyed datasets in geographic/fips_county/"
}