U.S. firearm regulation, ownership & outcomes

Balanced state and county panels. Data definitions & sources · Research report →

19792024

Tip: click a state to lock the panel on the right and pin it for side-by-side comparison (up to 2). Click the same state (or empty space) to unlock. Scroll on the map to zoom.

Data are aggregated to state-year (1979–2024) or county-year (2009–2024). The underlying variables are defined and sourced on the about page. The state map is built from a balanced panel of 50 states × 46 years (docs/data/panel.json); the county map loads one year of docs/data/county/{year}.json at a time on demand (3,133 counties × 16 years total).

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