ZIP code 63023: Big River, MO
ZIP code 63023 is in Jefferson County, Missouri, outside any city or Census-designated place. It is in Missouri's 3rd congressional district. Its state senate districts are State Senate District 3 (77%) and State Senate District 22 (23%); its state house districts are State House District 115 (77%) and State House District 111 (23%).
See it on the mapAll of Missouri
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 |
|---|---|
| Big River township | 77% |
| Meramec township | 23% |
| Central township | <0.1% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Missouri's 3rd congressional district (MO-03) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MO-03) | Robert F. Onder, Jr. (R) | 202-225-2956 | 100% |
| U.S. Senator | Eric Schmitt (R) | 202-224-5721 · contact form | statewide |
| U.S. Senator | Josh Hawley (R) | 202-224-6154 · contact form | statewide |
| State Senator (State Senate District 3) | Mike Henderson (R) | 77% | |
| State Senator (State Senate District 22) | Mary Elizabeth Coleman (R) | 23% | |
| State Representative (State House District 115) | Bill Lucas (R) | 77% | |
| State Representative (State House District 111) | Cecelie Williams (R) | 23% |
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.jeffcomo.org
- Jefferson County laws: search for the Jefferson County, Missouri code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 3 | 77% |
| State Senate District 22 | 23% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 115 | 77% |
| State House District 111 | 23% |
Voting precincts
3 voting precincts overlap ZIP 63023. 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:63023")
ZIP 63023 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.