Boundary Atlas

ZIP code 63105: Clayton, MO

ZIP code 63105 is in Clayton (89% of residents), St. Louis (5.9%) and University City (4.6%), in St. Louis County (94%) and St. Louis city (5.9%), Missouri. It is in Missouri's 1st congressional district. Its state senate districts are State Senate District 4 (95%) and State Senate District 14 (4.6%); its state house districts are State House District 99 (85%), State House District 86 (8.6%) and State House District 84 (5.9%).

18,846residents (2020 Census)
2.5 sq miland area
3cities and towns
1congressional district
13voting precincts

See it on the mapAll of Missouri

City and county

City or townShare of ZIP residents
Clayton89%
St. Louis5.9%
University City4.6%

CountyShare of ZIP residents
St. Louis County94%
St. Louis city5.9%

Town or county subdivisionShare of ZIP residents
Hadley township58%
Clayton township36%
St. Louis city5.9%
University township0.1%

Congressional district

Congressional districtShare of ZIP residents
Missouri's 1st congressional district (MO-01)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (MO-01)Wesley Bell (D)202-225-2406100%
U.S. SenatorEric Schmitt (R)202-224-5721 · contact formstatewide
U.S. SenatorJosh Hawley (R)202-224-6154 · contact formstatewide
State Senator (State Senate District 4)Karla May (Democratic)95%
State Senator (State Senate District 14)Brian Williams (Democratic)4.6%
State Representative (State House District 86)Jeff Hales (Democratic)8.6%
State Representative (State House District 84)Del Taylor (Democratic)5.9%

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 495%
State Senate District 144.6%

State house districtShare of ZIP residents
State House District 9985%
State House District 868.6%
State House District 845.9%

Voting precincts

13 voting precincts overlap ZIP 63105. Map them, with each precinct's share of the ZIP's residents.

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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:63105")

ZIP 63105 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.