Collinsville, Illinois
Collinsville is a city in Madison County (89% of residents) and St. Clair County (11%), Illinois, with 24,490 residents in 2020. It spans 2 congressional districts: IL-13 (82%) and IL-15 (18%). It spans 2 state senate and 3 state house districts.
County
| County | Share of residents |
|---|---|
| Madison County | 89% |
| St. Clair County | 11% |
Congressional districts
| Congressional district | Share of residents |
|---|---|
| Illinois's 13th congressional district (IL-13) | 82% |
| Illinois's 15th congressional district (IL-15) | 18% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-13) | Nikki Budzinski (D) | 202-225-2371 | 82% |
| U.S. Representative (IL-15) | Mary E. Miller (R) | 202-225-5271 | 18% |
| U.S. Senator | Richard J. Durbin (D) | 202-224-2152 · contact form | statewide |
| U.S. Senator | Tammy Duckworth (D) | 202-224-2854 · contact form | statewide |
| State Senator (State Senate District 56) | Erica Harriss (R) | 618-307-5789 | 99% |
| State Senator (State Senate District 55) | Jason Plummer (R) | 618-283-3000 | 1.4% |
| State Representative (State House District 112) | Katie Stuart (Democratic) | 618-365-6650 | 97% |
| State Representative (State House District 111) | Amy Elik (R) | 618-433-8046 | 2.0% |
| State Representative (State House District 109) | Charlie Meier (R) | 618-651-0405 | 1.4% |
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
- Collinsville website: http://www.discovercollinsville.com/
- Collinsville laws: search for the Collinsville, Illinois code of ordinances
- Madison County website: http://www.co.madison.il.us
- Madison County laws: search for the Madison County, Illinois code of ordinances
- St. Clair County laws: search for the St. Clair County, Illinois code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 56 | 99% |
| State Senate District 55 | 1.4% |
| State house district | Share of residents |
|---|---|
| State House District 112 | 97% |
| State House District 111 | 2.0% |
| State House District 109 | 1.4% |
ZIP codes
Percentages mark ZIPs only partly in Collinsville: the share of that ZIP's residents living in it.
- 62234 (77%)
Get this in your AI agent
Your agent can get Collinsville's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:1715599")
Collinsville 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.