U.S. county-level election results: President, U.S. House and U.S. Senate, 1990-2024

Candidate-level county results for U.S. House (1990-2024), President (1992-2024) and U.S. Senate (1990-2024) regular general elections in the 48 contiguous states (no Alaska, Hawaii or DC). 420,503 candidate rows covering 54,939 House, 27,969 President and 37,283 Senate county-years, assembled from 1,523 documented sources: state election offices' reports, files and websites, the MIT Election Data and Science Lab (MEDSL), OpenElections, and Algara & Amlani's historical returns. Every source is described in SOURCES.csv (publisher, document, locator, transcription method, license terms), every data error found and how it was handled is in data_corrections_log.csv, and every state-year that is not fully covered is listed with its reason in us_county_results_gaps.csv (41 state-years at v1.0.0, most of them unopposed House seats that were not on the ballot or Senate years with only a special election). Files: us_county_results_long.csv / .parquet (one row per year x office x county x district x candidate x party line), us_county_results_summary.csv (county totals and shares), us_county_results_gaps.csv, us_county_results_no_ballot.csv, SOURCES.csv, data_corrections_log.csv, DATA_DICTIONARY.md, CHANGELOG.md, VERSION, SHA256SUMS.txt, and a zip of all of them. Code and documentation: github.com/pmheideman/us-county-election-results. Interactive map: pmheideman.shinyapps.io/us-county-election-results. License: CC BY 4.0 for the compilation, corrections and documentation. The underlying state records keep their own terms; see LICENSE-DATA.md in the repository and the license columns of SOURCES.csv.