ZIP code 63368: O'Fallon, MO
ZIP code 63368 is in O'Fallon (67% of residents) and Dardenne Prairie (28%), in St. Charles County, Missouri. 5.5% of its residents live outside city limits. It is in Missouri's 2nd congressional district (89%) and Missouri's 3rd congressional district (11%). Its state senate district is State Senate District 2; its state house districts are State House District 107 (71%), State House District 108 (22%), State House District 103 (6.6%) and State House District 102 (0.3%).
See it on the mapAll of Missouri
City and county
| City or town | Share of ZIP residents |
|---|---|
| O'Fallon | 67% |
| Dardenne Prairie | 28% |
| County | Share of ZIP residents |
|---|---|
| St. Charles County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Boone township | 41% |
| Weldon Spring township | 37% |
| Dardenne township | 13% |
| Lake St. Louis township | 8.8% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Missouri's 2nd congressional district (MO-02) | 89% |
| Missouri's 3rd congressional district (MO-03) | 11% |
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-02) | Ann Wagner (R) | 202-225-1621 | 89% |
| U.S. Representative (MO-03) | Robert F. Onder, Jr. (R) | 202-225-2956 | 11% |
| 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 2) | Nick Schroer (R) | 100% | |
| State Representative (State House District 107) | Mark Matthiesen (R) | 71% | |
| State Representative (State House District 108) | Mike Costlow (R) | 22% | |
| State Representative (State House District 103) | Dave Hinman (R) | 6.6% | |
| State Representative (State House District 102) | Richard West (R) | 0.3% |
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
- O'Fallon website: http://www.ofallon.mo.us/
- O'Fallon laws: search for the O'Fallon, Missouri code of ordinances
- Dardenne Prairie website: http://www.dardenneprairie.org/
- Dardenne Prairie laws: search for the Dardenne Prairie, 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 2 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 107 | 71% |
| State House District 108 | 22% |
| State House District 103 | 6.6% |
| State House District 102 | 0.3% |
Voting precincts
19 voting precincts overlap ZIP 63368. 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:63368")
ZIP 63368 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.