Add Latitude / Longitude Columns to Any Address Spreadsheet

Geocode your address list to lat/lng with the official Census Geocoder and download a ready-to-join CSV. Free, keyless, browser-based.

How it works

  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)Assembly (SLDL)Timezone
1600 Pennsylvania Ave NW, Washington, DC 20500District of Columbia (11001)1198 — Delegate District (at Large)Ward 2 (11002)— (DC has no lower chamber)America/New_York
350 5th Ave, New York, NY 10118New York County (36061)3612 — NY 12th DistrictState Senate 28 (36028)Assembly 75 (36075)America/New_York
1 Market St, San Francisco, CA 94105San Francisco County (06075)0611 — CA 11th DistrictState Senate 11 (06011)Assembly 17 (06017)America/Los_Angeles

Try it free

Open GeoFlow — free during beta

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

FAQ

What datum is returned?

NAD83 — practically identical to WGS84 (GPS) for most applications (differences are on the order of a meter).