State legislative district API: address to state senate and house districts and legislators

Send a U.S. street address and get back its upper-chamber (state senate) and lower-chamber (state house, assembly or house of delegates) districts and the current legislators for each, in all 50 states, plus the D.C. Council ward member for Washington, D.C. Districts come from the U.S. Census Bureau geocoder's current state legislative district layers; legislators come from Open States (CC0).

Request

curl -s "https://whorepresents.rjhsignaltech.workers.dev/v1/lookup?address=901+Bagby+St,+Houston,+TX+77002"

Response (excerpt of a real call)

Copied from a live call made 2026-09-10T20:48Z; the fields shown are exactly as returned, other fields are omitted here for length.

{
  "input": "901 Bagby St, Houston, TX 77002",
  "matched_address": "901 BAGBY ST, HOUSTON, TX, 77002",
  "state": "TX",
  "districts": {
    "state_upper": {
      "number": "13",
      "name": "State Senate District 13",
      "ocd_division_id": "ocd-division/country:us/state:tx/sldu:13",
      "census_code": "013",
      "officials_count": 1
    },
    "state_lower": {
      "number": "147",
      "name": "State House District 147",
      "ocd_division_id": "ocd-division/country:us/state:tx/sldl:147",
      "census_code": "147",
      "officials_count": 1
    }
  },
  "officials": [
    {
      "office": "State Senator",
      "name": "Borris Miles",
      "party": "Democratic",
      "phone": "713-665-8322",
      "email": "borris.miles@senate.texas.gov",
      "url": "https://senate.texas.gov/member.php?d=13",
      "ids": {
        "ocd_person": "ocd-person/3475b324-1c9b-4513-90e6-063aba5ac04e"
      },
      "district": "13",
      "source": "Open States (CC0)"
    },
    {
      "office": "State Representative",
      "name": "Jo Jones",
      "party": "Democratic",
      "phone": "713-522-0555",
      "email": "jolanda.jones@house.texas.gov",
      "url": "https://house.texas.gov/members/4105",
      "ids": {
        "ocd_person": "ocd-person/45cd43ff-77b3-467c-aa61-890ebee8ece5"
      },
      "district": "147",
      "source": "Open States (CC0)"
    }
  ],
  "match_status": {
    "state_upper": "matched",
    "state_lower": "matched"
  }
}

Details

• Division IDs follow the OCD style (ocd-division/country:us/state:tx/sldu:13, .../sldl:147), built from Census district names; named districts, for example in New Hampshire and Massachusetts, become slugs such as sldl:merrimack_24.
• Multi-member districts return every current member. Idaho House seats A and B are both returned for the district.
• match_status per chamber: matched; unmatched when the district has no current member in Open States or the names differ between sources (no legislator is guessed); not_applicable_unicameral for Nebraska's lower chamber; not_applicable_no_state_legislature for Washington, D.C.
• Batch: POST /v1/batch takes up to 40 addresses per request, each counted as one lookup.

Honest limits

• Legislator data is a snapshot from Open States, which may lag vacancies, appointments and special elections.
• Districts follow the Census Bureau's current vintage; after a mid-decade redistricting, results follow the Census update schedule.
• The address must geocode; check matched_address.

Pricing

More

Home, live demo and full documentation · Migrating from the Google Civic Information API · OpenAPI 3.1 description · MCP server for AI assistants: https://whorepresents.rjhsignaltech.workers.dev/mcp

Data: U.S. Census Bureau Geocoder and 2020 ZCTA relationship files; unitedstates/congress-legislators (CC0); Open States (CC0). This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. Results can be wrong or out of date; check anything that matters against the official source. Contact: rjhsignaltech@gmail.com; replies come from the AI that operates the company.