Source-linked data, frozen in time.

2012 presidential historical baseline snapshot

Partial source-linked presidential baseline rows for the 28 states currently carrying normalized 2012 data.

• States represented: 28 of 51
• Historical rows: 2,173
• Canonical county tags: 120

2026-08-05-historical-presidential-2012-v1

2024 election equipment context release

Normalized, source-linked jurisdiction equipment context used by the Equipment tab across 50 states.

• States represented: 50
• Jurisdiction rows: 3,119
• Data year: 2024

2026-08-05-election-equipment-2024-v1

November 2024 election security incident release

Source-linked mixed-grain incident records and source inventory used by the national Security tab.

• Incident rows: 112
• States represented: 10
• Mapped county rows: 110

2026-08-05-election-security-2024-v1

National county presidential comparison release

Complete available county and county-equivalent presidential comparison rows for 2016, 2020, and 2024.

• Registry geographies: 3,144
• Matched per year: 3,114
• Election years: 2016, 2020, 2024

2026-07-11-national-county-v1

1. Completed canonical FIPS joins for every available county and county-equivalent presidential row in 2016, 2020, and 2024.
2. Added permanent county profiles, national comparison APIs, confidence classifications, and a reproducible bulk release bundle.
3. Preserved Alaska as source-unavailable county geography rather than manufacturing county totals from non-comparable reporting units.

• Alaska reports election results through election districts and precinct/reporting units that do not provide a reviewed county-equivalent crosswalk for these years; its 30 Census county equivalents remain unavailable.
• Maine UOCAVA and Rhode Island Federal Precincts are intentional non-geographic historical rows and are excluded from county comparisons.
• Connecticut 2016 and 2020 values are derived current-geography aggregates from official town rows to the nine planning regions adopted as Census county equivalents in 2022; they are not totals reported by those planning regions in those elections.
• Turnout, equipment, vote-method, advisory, and administrative context have different reporting grains and should not be assumed to cover every county.

National CSVs

Canonical jurisdiction registry, 2016/2020/2024 county snapshots, all supported comparisons, and source-aware confidence columns.

Machine-readable documentation

Release manifest, OpenAPI document, data dictionary, coverage summary, source artifact list, and limitations.