How a county voted — and how divided it is inside

2024 presidential two-party result. Switch between each county's margin and the vote-weighted standard deviation of its precincts' margins (its internal division, in points). Hover any county for both numbers. Counties with fewer than 5 reported precincts are drawn in beige.

Internal division is the standard deviation of precinct two-party margins within a county, weighted by each precinct's two-party votes, shown in percentage points; higher means the county's neighborhoods disagree more sharply. The map is drawn at county resolution — it colors counties by a precinct-derived number, it does not draw precinct boundaries. 2,943 counties have at least 5 reported precincts; Alaska reports by district and is shown where available.

The middle is thinner up close

Share of the two-party vote cast in places of each margin, 2024 presidential.

precincts (filled) counties Trump won the place Harris won the place
Two-party margin = (Harris − Trump) / (Harris + Trump). Both curves are vote-weighted and integrate to 100%. The county curve carries more weight near the center; the precinct curve carries more in the partisan tails — the visual signature of sorting that county data smooths over.

Inside six "purple" counties

Each dot is a precinct, placed by its two-party margin and sized by its two-party votes. The line marks an even split; the county's own margin is printed above each panel.

Counties ordered by internal division. Bucks County, the one pollsters watch, is the near-exception — its precincts really are more evenly mixed (a 15-point spread) than the others, a reminder that a few purple counties are honestly purple. Most are not.