What County Is This Address In? (Free, Official Data)

A single answer box is fine for one address. When you have a hundred — or a spreadsheet — run them all through the Census Geocoder in one pass.

One address

The Census Geocoder answers "what county am I in" from a street address + city + state. PO Boxes return NO_MATCH.

A whole list

  1. Open GeoFlow
  2. Paste your addresses (one per line) or upload a CSV and pick the address column
  3. Click Run — each address is matched against the free U.S. Census Bureau Geocoder
  4. Download the enriched CSV

Example output

Input addressCountyCongressionalState Senate (SLDU)House/Assembly (SLDL)Timezone
1301 I ST, SACRAMENTO, CA, 95814Sacramento County (06067)0607 — Congressional District 706008 — State Senate District 806006 — Assembly District 6
350 5TH AVE, NEW YORK, NY, 10118New York County (36061)3612 — Congressional District 1236028 — State Senate District 2836075 — Assembly District 75
1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500District of Columbia (11001)1198 — Delegate District (at Large)11002 — Ward 2—

Try it free

Open GeoFlow — free up to 100 addresses per run

Data source: U.S. Census Bureau Geocoder (public domain). Timezone: tz-lookup (MIT).

FAQ

Does "where am I" need GPS?

No — this is address-based lookup, not device location. Nothing about your device is used or stored.