Which County Are You In?
Aurora sprawls across Adams, Arapahoe and Douglas counties — your county decides your court, your ballot and your health department.
Look up your address
Lookup uses OpenStreetMap’s Nominatim geocoder on our server — addresses are never stored. Near county lines, confirm with the county’s official parcel map.
Aurora’s three counties
Arapahoe County
arapahoegov.comMost of Aurora — including the City Hall corridor, Havana Street and the Anschutz/Fitzsimons area.
Adams County
adcogov.orgNorthern Aurora — the newer growth north of I-70 toward the airport.
Douglas County
douglas.co.usThe southern tip — Southlands and the Tallyn's Reach edge of the city.
Why your county matters
Courts & jury duty
Each county runs its own district/county court — jury summons and filings go to different buildings.
Elections & ballot
County clerks run elections, registration and ballot drop boxes — down-ballot races differ across the line.
Vehicle registration
Motor-vehicle offices are county-run; fees and wait times vary between the three.
Public health
After the Tri-County Health split, each county now runs its own health department and programs.