ZIP code 63304: Cottleville, MO
ZIP code 63304 is in Weldon Spring (13% of residents), St. Peters (9.2%), Cottleville (6.9%) and O'Fallon (4.0%), in St. Charles County, Missouri. 67% of its residents live outside city limits. It is in Missouri's 3rd congressional district (96%) and Missouri's 2nd congressional district (3.6%). Its state senate districts are State Senate District 23 (54%) and State Senate District 2 (46%); its state house districts are State House District 69 (49%), State House District 102 (44%), State House District 107 (4.0%), State House District 65 (2.3%) and State House District 104 (1.6%).
See it on the mapAll of Missouri
City and county
| City or town | Share of ZIP residents |
|---|---|
| Weldon Spring | 13% |
| St. Peters | 9.2% |
| Cottleville | 6.9% |
| O'Fallon | 4.0% |
| Weldon Spring Heights | 0.2% |
| County | Share of ZIP residents |
|---|---|
| St. Charles County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Cottleville township | 49% |
| Harvester township | 29% |
| St. Peters township | 9.5% |
| Dardenne township | 8.8% |
| Weldon Spring township | 3.3% |
| Boone township | 0.2% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Missouri's 3rd congressional district (MO-03) | 96% |
| Missouri's 2nd congressional district (MO-02) | 3.6% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MO-03) | Robert F. Onder, Jr. (R) | 202-225-2956 | 96% |
| U.S. Representative (MO-02) | Ann Wagner (R) | 202-225-1621 | 3.6% |
| 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 23) | Adam Schnelting (R) | 54% | |
| State Senator (State Senate District 2) | Nick Schroer (R) | 46% | |
| State Representative (State House District 69) | Scott Miller (R) | 49% | |
| State Representative (State House District 102) | Richard West (R) | 44% | |
| State Representative (State House District 107) | Mark Matthiesen (R) | 4.0% | |
| State Representative (State House District 65) | Wendy Hausman (R) | 2.3% | |
| State Representative (State House District 104) | Terri Violet (R) | 1.6% |
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
- Weldon Spring website: https://weldonspring.gov
- Weldon Spring laws: search for the Weldon Spring, Missouri code of ordinances
- St. Peters website: http://www.stpetersmo.net/
- St. Peters laws: search for the St. Peters, Missouri code of ordinances
- Cottleville laws: search for the Cottleville, Missouri code of ordinances
- St. Charles County website: http://www.sccmo.org
- St. Charles County laws: search for the St. Charles County, Missouri code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 23 | 54% |
| State Senate District 2 | 46% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 69 | 49% |
| State House District 102 | 44% |
| State House District 107 | 4.0% |
| State House District 65 | 2.3% |
| State House District 104 | 1.6% |
Voting precincts
17 voting precincts overlap ZIP 63304. 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:63304")
ZIP 63304 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.