Boundary Atlas

St. Clair, Michigan

St. Clair is a city in St. Clair County, Michigan, with 5,464 residents in 2020. It is in Michigan's 9th congressional district. It spans 2 state house districts. Its state senate district is State Senate District 25.

5,464residents (2020 Census)
2.9 sq miland area
1ZIP codes
1congressional district

County

CountyShare of residents
St. Clair County100%

Congressional district

Congressional districtShare of residents
Michigan's 9th congressional district (MI-09)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (MI-09)Lisa C. McClain (R)202-225-2106100%
U.S. SenatorElissa Slotkin (D)202-224-4822statewide
U.S. SenatorGary C. Peters (D)202-224-6221 · contact formstatewide
State Senator (State Senate District 25)Dan Lauwers (R)100%
State Representative (State House District 63)Jay DeBoyer (R)100%
State Representative (State House District 64)Joe Pavlov (R)0.2%

Elected under MI's previous legislative map; the district's lines changed for 2026.

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 residents
State Senate District 25100%

State house districtShare of residents
State House District 63100%
State House District 640.2%

ZIP codes

Percentages mark ZIPs only partly in St. Clair: the share of that ZIP's residents living in it.

Get this in your AI agent

Your agent can get St. Clair's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:place:2670680")

St. Clair here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.