ZIP code 63303: St. Charles, MO
ZIP code 63303 is in St. Charles (55% of residents) and St. Peters (4.7%), in St. Charles County, Missouri. 40% of its residents live outside city limits. It is in Missouri's 3rd congressional district. Its state senate districts are State Senate District 23 (98%) and State Senate District 2 (2.4%); its state house districts are State House District 105 (57%), State House District 69 (34%) and State House District 104 (8.2%).
See it on the mapAll of Missouri
City and county
| City or town | Share of ZIP residents |
|---|---|
| St. Charles | 55% |
| St. Peters | 4.7% |
| County | Share of ZIP residents |
|---|---|
| St. Charles County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Frontier township | 47% |
| Zumbehl township | 35% |
| Harvester township | 18% |
| Spencer Creek township | 0.7% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Missouri's 3rd congressional district (MO-03) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Dan Borgmeyer | 55% | |
| 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 23) | Adam Schnelting (R) | 98% | |
| State Senator (State Senate District 2) | Nick Schroer (R) | 2.4% | |
| State Representative (State House District 105) | Colin Wellenkamp (R) | 57% | |
| State Representative (State House District 69) | Scott Miller (R) | 34% | |
| State Representative (State House District 104) | Terri Violet (R) | 8.2% |
From Wikidata (community-maintained); confirm on the city's website.
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); Mayors: Wikidata (CC0).
Local government
- St. Charles laws: search for the St. Charles, Missouri code of ordinances
- St. Peters website: http://www.stpetersmo.net/
- St. Peters laws: search for the St. Peters, 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 | 98% |
| State Senate District 2 | 2.4% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 105 | 57% |
| State House District 69 | 34% |
| State House District 104 | 8.2% |
Voting precincts
14 voting precincts overlap ZIP 63303. 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:63303")
ZIP 63303 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.