Append County, Congressional & State Legislative Districts to District of Columbia Addresses

Free browser tool for District of Columbia address lists: add county, county-equivalent FIPS, congressional district, state senate and house/assembly districts, plus timezone — in one pass, powered by official Census Bureau data.

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

Real example — 1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500

Input addressCountyCongressionalState Senate (SLDU)House/Assembly (SLDL)Timezone
1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500District of Columbia (11001)1198 — Delegate District (at Large)11002 — Ward 2—

Actual output from the live Census Geocoder for 1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500.

District of Columbia facts

DC uses wards as its SLDU layer and has no lower chamber; its congressional entry is 1198 — Delegate District (at Large).

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

What county is Washington, District of Columbia in?

The example above — 1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500 — falls in District of Columbia (FIPS 11001).

Which congressional district covers District of Columbia?

Congressional districts are numbered per state; the GEOID is the state FIPS (11) plus the district number. Run any District of Columbia address through the tool to get its current district, senatorial and house/assembly districts in one pass.

Does this work for the whole state?

Yes — the tool covers all of District of Columbia. The Census Geocoder needs a street address (PO Boxes return NO_MATCH); misspellings and wrong ZIPs are usually auto-corrected.

Is it free?

Yes — up to 100 addresses per run on the free plan, powered by the free official Census Geocoder. A one-time $9 credit pack raises the limit to 1,000 addresses per run.