Boundary Atlas

ZIP code 49040: Colon, MI

ZIP code 49040 is in Colon (35% of residents), in St. Joseph County (91%) and Branch County (8.9%), Michigan. 65% of its residents live outside city limits. It is in Michigan's 5th congressional district. Its state senate district is State Senate District 17; its state house districts are State House District 36 (91%) and State House District 35 (8.9%).

3,404residents (2020 Census)
41.2 sq miland area
1cities and towns
1congressional district
4voting precincts

See it on the mapAll of Michigan

City and county

City or townShare of ZIP residents
Colon35%

CountyShare of ZIP residents
St. Joseph County91%
Branch County8.9%

Town or county subdivisionShare of ZIP residents
Colon township83%
Leonidas township7.8%
Sherwood township5.4%
Matteson township3.5%

Congressional district

Congressional districtShare of ZIP residents
Michigan's 5th congressional district (MI-05)100%

Members of Congress

OfficeMemberContact
U.S. Representative (MI-05)Tim Walberg (R)202-225-6276
U.S. SenatorElissa Slotkin (D)202-224-4822
U.S. SenatorGary C. Peters (D)202-224-6221 · contact form

Members serving now (119th Congress, until January 3, 2027). Source: Members of Congress: the @unitedstates project, congress-legislators (CC0).

State legislative districts

State senate districtShare of ZIP residents
State Senate District 17100%

State house districtShare of ZIP residents
State House District 3691%
State House District 358.9%

Voting precincts

4 voting precincts overlap ZIP 49040. 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:49040")

ZIP 49040 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.