Civic Result MapsCounty election profile

Kentucky · county

Jefferson County

FIPS 21111county:21111Derived

Also indexed as: Jefferson

A permanent, source-linked view of the county's 2016, 2020, and 2024 presidential history, turnout, election-administration context, and non-conclusive review signals.

Presidential results

2016–2024 county history

3 of 3 years available
YearDemocraticRepublicanOtherTotalWinner / marginConfidenceSource
2016190,836Hillary Clinton · 54.05%143,768Donald Trump · 40.72%18,495353,099Democratic +47,068 (13.33%)ExactOfficial historical county presidential results
2020228,358Joe Biden · 59.06%150,646Donald Trump · 38.96%7,625386,629Democratic +77,712 (20.10%)ExactOfficial historical county presidential results
2024203,070Kamala Harris · 57.43%144,553Donald Trump · 40.88%5,986353,609Democratic +58,517 (16.55%)DerivedDerived text extraction from official county recap PDFs

“Other” includes all other loaded presidential candidates and write-ins. Margin is the absolute gap between the Democratic and Republican vote buckets, divided by all loaded presidential votes.

Participation

2024 turnout context

Proxy
Ballots cast
350,544
Registered voters
631,154
Reported/calculated rate
55.54%
Reporting grain
jurisdiction

EAC-reported registered-voter denominator

EAC fallback turnout rows

Administration context

Vote methods

No county-tagged vote-method rows are available.

Administration context

Voting equipment

1 source-linked row

Equipment metadata is jurisdiction context only. It is not a vote or turnout row, does not prove or disprove an advisory signal, and does not guarantee every precinct or ballot mode used one identical setup.

VendorSystemType / usePaper recordTabulationConfidenceSource
ES&SES&S ExpressVote +Optical Scan · county_contexthand_marked_paperOptical ScanProxySource

Review context

Advisory indicators

2 matched indicators

These calculated indicators are prompts for checking source data, reporting grain, denominators, and local context. They are not evidence or findings of fraud, misconduct, or an incorrect election outcome.

average down ballot difference · severity 2.90

Average down-ballot difference

Average President-vs-down-ballot difference crossed threshold: DEM -2.51%, REP 2.10%.

Calculation detail

The average gap between presidential votes and same-party down-ballot votes is large enough to review. Split-ticket voting can explain some gap; this flag identifies areas needing supporting records.

vote share pattern · severity 2.90

Vote-share pattern

Vote-share correlation crossed threshold: Trump r=0.574, Harris r=0.133.

Calculation detail

Bigger local reporting-unit vote totals move with candidate vote share strongly enough to pass the native review threshold. This is an advisory review flag, not proof of tampering.

Traceability

Sources and provenance

4 referenced sources
Canonical geography

Jefferson County · county:21111

Geometry registry artifact: ky-counties.geojson

Official historical county presidential results

Official historical county presidential results

Kentucky Secretary of State

Official historical county presidential baseline rows used for context only. The script retains source PDFs in data/ky-historical-official-results and validates statewide Democratic, Republican, and total-vote sums against the PDF candidate total rows.Open source
Derived text extraction from official county recap PDFs

Derived text extraction from official county recap PDFs

Kentucky State Board of Elections

Deterministic text extraction used because the Python ETL has no PDF parser dependency. Official PDFs remain committed beside the derived text.Open source
EAC fallback turnout rows

EAC fallback turnout rows

U.S. Election Assistance Commission

National EAC fallback turnout rows. Prefer state election office denominator artifacts when available; keep fallback caveats visible in the app.Open source
equipment_context

Verified Voting Verifier KY 2024 equipment context

Verified Voting

Verified Voting Verifier data is jurisdiction-level election-administration context. Most rows are counties, but some states report state-level rows and some county rows can summarize mixed tabulation, accessible-device, absentee, poll-book, or other configurations. Treat it as source-linked context, not proof every precinct in a county used one identical setup, and not a turnout or vote-result source.Open source