Election data for campaigns

Carmena’s Overton licenses three sets of election data to campaigns, consultants and researchers: a live results feed, precinct-level returns, and voter records linked to the demographics of where each voter lives. This page says what each one covers and where it stops. The 2026 results on our race pages come from the same live feed.

Live results from more than 3,300 feeds

We collect live results from AP and the media outlets that carry AP’s count (NYT, NBC, Fox, NPR and Bloomberg), from Decision Desk HQ, and from official state and county election sites, and normalise them to one schema. Every vote change from any source is pushed within about a second of being collected, over a WebSocket and as JSON. The newest report from any source wins. AP race calls come with their call times.

In 2026 the feed covered about 2,200 races: Senate, governor, House and local contests. Each has a live page with a county map, and a public JSON file.

Live election results API: sources, fields and a sample record

Precinct returns, past and live

Historical county and precinct returns come from MIT Election Data and Science Lab, Harvard Election Data Archive and OpenElections. Live precinct results are collected where the official source publishes them. In 2026 that was North Carolina, where all counties except Mecklenburg report by precinct and early-voting site, and Cumberland County, New Jersey, which reports by election district.

Precinct-level election data: sources and 2026 coverage

Voter records linked to Census demographics

We hold voter-level records from the state voter files of Texas, Ohio, Maine, Nevada, Florida and Kansas, and North Carolina’s registration and voter-history files. Each record is linked to Census geography, so turnout and party can be broken down by the demographics of a precinct, county or district. On this site we use them for early-vote analysis by party and by new against habitual voters. They are licensed for civic engagement and election purposes only.

Voter and demographic data: states and uses

Sources and free data

Where each figure on this site comes from is listed on our Methodology page. The data behind our public charts is free to use with credit on the Data page.