ZIP code 40231: Jefferson County, KY
ZIP code 40231 is in Jefferson County, Kentucky, outside any city or Census-designated place. It is in Kentucky's 3rd congressional district. Its state senate district is State Senate District 19; its state house district is State House District 41.
See it on the mapAll of Kentucky
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Jefferson County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Central Jefferson CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Kentucky's 3rd congressional district (KY-03) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (KY-03) | Morgan McGarvey (D) | 202-225-5401 | 100% |
| U.S. Senator | Mitch McConnell (R) | 202-224-2541 · contact form | statewide |
| U.S. Senator | Rand Paul (R) | 202-224-4343 · contact form | statewide |
| State Senator (State Senate District 19) | Cassie Armstrong (Democratic) | 100% | |
| State Representative (State House District 41) | Mary Lou Marzian (Democratic) | 502-541-1376 | 100% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Jefferson County website: http://www.louisvilleky.gov
- Jefferson County laws: search for the Jefferson County, Kentucky code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 19 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 41 | 100% |
Voting precincts
1 voting precinct overlap ZIP 40231. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:40231")
ZIP 40231 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.