{"data":{"aliases":["Cook"],"advisoryIndicators":[{"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.","electionYear":2024,"id":"b31f0045-6e94-446d-ac52-ec5e791a39d9","jurisdictionCode":"IL-COOK","jurisdictionName":"Cook","jurisdictionTag":"county:17031","label":"Average down-ballot difference","level":"county","metrics":{"county":"Cook","rowCount":2564,"scopeType":"county","demOutliers":1,"repOutliers":49,"auditContext":null,"outlierTrigger":129,"trumpCorrelation":0.8202485383735107,"demAverageDropoff":-0.613893876755071,"harrisCorrelation":0.5203178615226833,"repAverageDropoff":3.0420486739469585,"denominatorContext":null,"comparisonCoverageMode":"presidentVsHouseContestedPrecinct","directionalScreenReason":"U.S. House races are district- and candidate-specific controls","directionalScreenConfidence":"low","comparableDownBallotRowCount":2564,"incomparableDownBallotRowCount":0},"severity":4.2522,"state":"IL","summary":"Average President-vs-down-ballot difference crossed threshold: DEM -0.61%, REP 3.04%.","type":"average_down_ballot_difference"},{"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.","electionYear":2024,"id":"248249e6-da61-4e6e-a1f8-e49d0ea86a7b","jurisdictionCode":"IL-COOK","jurisdictionName":"Cook","jurisdictionTag":"county:17031","label":"Vote-share pattern","level":"county","metrics":{"county":"Cook","rowCount":2564,"scopeType":"county","demOutliers":1,"repOutliers":49,"auditContext":null,"outlierTrigger":129,"trumpCorrelation":0.8202485383735107,"demAverageDropoff":-0.613893876755071,"harrisCorrelation":0.5203178615226833,"repAverageDropoff":3.0420486739469585,"denominatorContext":null,"comparisonCoverageMode":"presidentVsHouseContestedPrecinct","directionalScreenReason":"U.S. House races are district- and candidate-specific controls","directionalScreenConfidence":"low","comparableDownBallotRowCount":2564,"incomparableDownBallotRowCount":0},"severity":4.2522,"state":"IL","summary":"Vote-share correlation crossed threshold: Trump r=0.820, Harris r=0.520.","type":"vote_share_pattern"}],"caveats":[],"confidence":{"level":"derived","label":"Derived from official rows","shortLabel":"Derived","description":"The value is reproducibly aggregated, normalized, or calculated from official published rows.","caveat":"Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes. Official Illinois State Board of Elections CSV exports. Presidential rows are aggregated from Illinois election jurisdictions to Census counties for certified county results; separate city election authorities are rolled into their parent counties. Advisory review rows join President to U.S. House only where the same source jurisdiction/precinct key is unambiguous and the House race has both Democratic and Republican candidate votes."},"displayName":"Cook County","equipment":[{"absenteeSystem":"Batch-Fed Optical Scanners","accessibleSystem":"Ballot Marking Devices for all voters","configurationSignals":["polling-place system reports multiple values: Hand marked paper ballots, BMDs for accessibility","accessible voting system differs from standard polling-place system","absentee system differs from standard polling-place system"],"electionYear":2024,"equipmentType":"Optical Scan","id":"939dd433-6767-4394-b70c-549a7abcb025","jurisdictionCode":"IL-031","jurisdictionName":"Cook County","jurisdictionTag":"county:17031","level":"county","metrics":{"caveat":"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.","sourceUrl":"https://verifiedvoting.org/verifier/#mode/navigate/map/voteEquip/mapType/ppEquip/year/2024/state/17","uniformityNote":"Verifier row is a county-level summary. polling-place system reports multiple values: Hand marked paper ballots, BMDs for accessibility; accessible voting system differs from standard polling-place system; absentee system differs from standard polling-place system. Do not infer every precinct or ballot mode used one identical setup.","sourceGranularity":"county","configurationSignals":["polling-place system reports multiple values: Hand marked paper ballots, BMDs for accessibility","accessible voting system differs from standard polling-place system","absentee system differs from standard polling-place system"],"uniformityWarningRequired":true},"paperRecord":"hand_marked_paper","pollingPlaces":825,"pollBookSystem":"Commercial Electronic Poll Book","precincts":1430,"registeredVoters":1665034,"sourceGranularity":"county","sourceId":"il-2024-verified-voting-verifier-il-2024-equipment","sourceUrl":"https://verifiedvoting.org/verifier/#mode/navigate/map/voteEquip/mapType/ppEquip/year/2024/state/17","standardSystem":"Hand marked paper ballots, BMDs for accessibility","state":"IL","systemName":"Dominion ImageCast X BMD +","tabulation":"Optical Scan","uniformityNote":"Verifier row is a county-level summary. polling-place system reports multiple values: Hand marked paper ballots, BMDs for accessibility; accessible voting system differs from standard polling-place system; absentee system differs from standard polling-place system. Do not infer every precinct or ballot mode used one identical setup.","uniformityWarningRequired":true,"usage":"county_context","vendor":"Dominion","confidence":{"level":"proxy","label":"Contextual proxy","shortLabel":"Proxy","description":"The value is contextual or supplemental and should not be treated as a silent replacement for an official certified total.","caveat":"Verifier row is a county-level summary. polling-place system reports multiple values: Hand marked paper ballots, BMDs for accessibility; accessible voting system differs from standard polling-place system; absentee system differs from standard polling-place system. Do not infer every precinct or ballot mode used one identical setup."}}],"fips":"17031","geographyLevel":"county","geometrySource":"il-counties.geojson","history":[{"available":true,"demSharePct":74.68,"demVotes":1611946,"leader":"Democratic","marginPct":53.68,"marginVotes":1158659,"otherVotes":93382,"repSharePct":21,"repVotes":453287,"totalVotes":2158615,"candidateLabels":{"dem":"Hillary Clinton","rep":"Donald Trump"},"caveats":["Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes."],"confidence":{"level":"exact","label":"Exact reported geography","shortLabel":"Exact","description":"The published row maps directly to the canonical county or county-equivalent geography.","caveat":"Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes."},"source":{"authority":"Illinois State Board of Elections","category":"Normalized official 2016 and 2020 county presidential historical baselines","confidence":"Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes.","id":"il-2024-il-historical-presidential-baseline","sourceUrl":"https://www.elections.il.gov/Downloads/ElectionOperations/VoteTotals/GE2016Cty.xls","status":"loaded","title":"Normalized official 2016 and 2020 county presidential historical baselines"},"sourceLevel":"county","year":2016},{"available":true,"demSharePct":74.35,"demVotes":1725973,"leader":"Democratic","marginPct":50.3,"marginVotes":1167704,"otherVotes":37244,"repSharePct":24.05,"repVotes":558269,"totalVotes":2321486,"candidateLabels":{"dem":"Joe Biden","rep":"Donald Trump"},"caveats":["Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes."],"confidence":{"level":"exact","label":"Exact reported geography","shortLabel":"Exact","description":"The published row maps directly to the canonical county or county-equivalent geography.","caveat":"Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes."},"source":{"authority":"Illinois State Board of Elections","category":"Normalized official 2016 and 2020 county presidential historical baselines","confidence":"Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes.","id":"il-2024-il-historical-presidential-baseline","sourceUrl":"https://www.elections.il.gov/Downloads/ElectionOperations/VoteTotals/GE2020Cty.xls","status":"loaded","title":"Normalized official 2016 and 2020 county presidential historical baselines"},"sourceLevel":"county","year":2020},{"available":true,"demSharePct":69.63,"demVotes":1447821,"leader":"Democratic","marginPct":41.55,"marginVotes":863969,"otherVotes":47566,"repSharePct":28.08,"repVotes":583852,"totalVotes":2079239,"candidateLabels":{"dem":"Kamala Harris","rep":"Donald Trump"},"caveats":["Official Illinois State Board of Elections CSV exports. Presidential rows are aggregated from Illinois election jurisdictions to Census counties for certified county results; separate city election authorities are rolled into their parent counties. Advisory review rows join President to U.S. House only where the same source jurisdiction/precinct key is unambiguous and the House race has both Democratic and Republican candidate votes."],"confidence":{"level":"derived","label":"Derived from official rows","shortLabel":"Derived","description":"The value is reproducibly aggregated, normalized, or calculated from official published rows.","caveat":"Official Illinois State Board of Elections CSV exports. Presidential rows are aggregated from Illinois election jurisdictions to Census counties for certified county results; separate city election authorities are rolled into their parent counties. Advisory review rows join President to U.S. House only where the same source jurisdiction/precinct key is unambiguous and the House race has both Democratic and Republican candidate votes."},"source":{"authority":"Illinois State Board of Elections","category":"Official precinct result CSVs by office","confidence":"Official Illinois State Board of Elections CSV exports. Presidential rows are aggregated from Illinois election jurisdictions to Census counties for certified county results; separate city election authorities are rolled into their parent counties. Advisory review rows join President to U.S. House only where the same source jurisdiction/precinct key is unambiguous and the House race has both Democratic and Republican candidate votes.","id":"il-2024-il-2024-general-by-office-csvs","sourceUrl":"https://www.elections.il.gov/ElectionOperations/ElectionVoteTotals.aspx?ID=66","status":"loaded","title":"Official precinct result CSVs by office"},"sourceLevel":"county","year":2024}],"jurisdictionTag":"county:17031","sources":[{"authority":"Illinois State Board of Elections","category":"Normalized official 2016 and 2020 county presidential historical baselines","confidence":"Exactly 102 county rows per year with canonical county:<GEOID> tags. All candidate votes are retained; non-Democratic/non-Republican and write-in candidate rows are included in other_votes.","id":"il-2024-il-historical-presidential-baseline","sourceUrl":"https://www.elections.il.gov/Downloads/ElectionOperations/VoteTotals/GE2020Cty.xls","status":"loaded","title":"Normalized official 2016 and 2020 county presidential historical baselines"},{"authority":"Illinois State Board of Elections","category":"Official precinct result CSVs by office","confidence":"Official Illinois State Board of Elections CSV exports. Presidential rows are aggregated from Illinois election jurisdictions to Census counties for certified county results; separate city election authorities are rolled into their parent counties. Advisory review rows join President to U.S. House only where the same source jurisdiction/precinct key is unambiguous and the House race has both Democratic and Republican candidate votes.","id":"il-2024-il-2024-general-by-office-csvs","sourceUrl":"https://www.elections.il.gov/ElectionOperations/ElectionVoteTotals.aspx?ID=66","status":"loaded","title":"Official precinct result CSVs by office"},{"authority":"U.S. Election Assistance Commission","category":"EAC fallback turnout rows","confidence":"National EAC fallback turnout rows. Prefer state election office denominator artifacts when available; keep fallback caveats visible in the app.","id":"il-2024-il-2024-eac-turnout","sourceUrl":"https://www.eac.gov/research-and-data/studies-and-reports","status":"loaded","title":"EAC fallback turnout rows"},{"authority":"Verified Voting","category":"equipment_context","confidence":"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.","id":"il-2024-verified-voting-verifier-il-2024-equipment","sourceUrl":"https://verifiedvoting.org/verifier/#mode/navigate/map/voteEquip/mapType/ppEquip/year/2024/state/17","status":"loaded","title":"Verified Voting Verifier IL 2024 equipment context"}],"state":"IL","stateName":"Illinois","turnout":{"available":true,"ballotsCast":1112978,"confidence":{"level":"proxy","label":"Contextual proxy","shortLabel":"Proxy","description":"The value is contextual or supplemental and should not be treated as a silent replacement for an official certified total.","caveat":"EAC-reported registered-voter denominator"},"denominatorNotes":["EAC-reported registered-voter denominator"],"level":"jurisdiction","registeredVoters":1800799,"rowCount":1,"source":{"authority":"U.S. Election Assistance Commission","category":"EAC fallback turnout rows","confidence":"National EAC fallback turnout rows. Prefer state election office denominator artifacts when available; keep fallback caveats visible in the app.","id":"il-2024-il-2024-eac-turnout","sourceUrl":"https://www.eac.gov/research-and-data/studies-and-reports","status":"loaded","title":"EAC fallback turnout rows"},"turnoutPct":61.8,"warningRequired":false,"year":2024},"voteMethods":[]},"meta":{"generatedAt":"2026-07-26T18:55:02.220Z","source":"database","releaseId":null,"schemaVersion":"1.0.0","caveat":"Advisory indicators are source-review prompts, not findings of fraud or misconduct.","contract":"county:<five-digit Census GEOID>","electionYears":[2016,2020,2024],"fips":"17031"}}