ZIP code 63123: Affton, MO
ZIP code 63123 is in Affton (40% of residents), Concord (11%), Green Park (5.3%), St. Louis (4.2%), Marlborough (3.8%), Crestwood (3.8%), Lakeshire (3.0%), St. George (3.0%), Lemay (2.3%) and Grantwood Village (1.8%), in St. Louis County (96%) and St. Louis city (4.2%), Missouri. 22% of its residents live outside city limits. It is in Missouri's 2nd congressional district (96%) and Missouri's 1st congressional district (4.2%). Its state senate districts are State Senate District 1 (84%) and State Senate District 4 (16%); its state house districts are State House District 92 (47%), State House District 93 (21%), State House District 91 (15%), State House District 83 (8.7%), State House District 96 (3.8%), State House District 81 (3.4%) and State House District 82 (0.8%).
See it on the mapAll of Missouri
City and county
| City or town | Share of ZIP residents |
|---|---|
| Affton | 40% |
| Concord | 11% |
| Green Park | 5.3% |
| St. Louis | 4.2% |
| Marlborough | 3.8% |
| Crestwood | 3.8% |
| Lakeshire | 3.0% |
| St. George | 3.0% |
| Lemay | 2.3% |
| Grantwood Village | 1.8% |
| Wilbur Park | 0.9% |
| County | Share of ZIP residents |
|---|---|
| St. Louis County | 96% |
| St. Louis city | 4.2% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Concord township | 56% |
| Gravois township | 37% |
| St. Louis city | 4.2% |
| Lemay township | 3.0% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Missouri's 2nd congressional district (MO-02) | 96% |
| Missouri's 1st congressional district (MO-01) | 4.2% |
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 | 96% |
| U.S. Representative (MO-01) | Wesley Bell (D) | 202-225-2406 | 4.2% |
| 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 1) | Doug Beck (Democratic) | 84% | |
| State Senator (State Senate District 4) | Karla May (Democratic) | 16% | |
| State Representative (State House District 92) | Michael Burton (Democratic) | 47% | |
| State Representative (State House District 93) | Bridget Moore (Democratic) | 21% | |
| State Representative (State House District 91) | Jo Doll (Democratic) | 15% | |
| State Representative (State House District 83) | Ray Reed (Democratic) | 8.7% | |
| State Representative (State House District 96) | Brad Christ (R) | 3.8% | |
| State Representative (State House District 81) | Steve Butz (Democratic) | 3.4% | |
| State Representative (State House District 82) | Nick Kimble (Democratic) | 0.8% |
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
- Affton laws: search for the Affton, Missouri code of ordinances
- Concord laws: search for the Concord, Missouri code of ordinances
- Green Park laws: search for the Green Park, Missouri code of ordinances
- St. Louis County laws: search for the St. Louis County, Missouri code of ordinances
- St. Louis city website: https://greaterstlinc.com/
- St. Louis city laws: search for the St. Louis city, Missouri code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 1 | 84% |
| State Senate District 4 | 16% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 92 | 47% |
| State House District 93 | 21% |
| State House District 91 | 15% |
| State House District 83 | 8.7% |
| State House District 96 | 3.8% |
| State House District 81 | 3.4% |
| State House District 82 | 0.8% |
Voting precincts
58 voting precincts overlap ZIP 63123. 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:63123")
ZIP 63123 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.