Append the Timezone (IANA Name) to Every Address in Your List

Batch-add timezone names like America/New_York to address lists. Timezone is derived locally from matched coordinates — no extra API calls.

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

Why IANA names instead of abbreviations?

IANA names (e.g. America/Indiana/Indianapolis) are unambiguous and directly usable in code and scheduling tools.

Does it handle DST edge cases?

Yes — the IANA database encodes the full DST history per region.