Centralia, Illinois
Centralia is a city in Marion County (82% of residents) and Clinton County (18%), Illinois, with 12,182 residents in 2020. It is in Illinois's 12th congressional district. Its state senate district is State Senate District 55; its state house district is State House District 110.
County
| County | Share of residents |
|---|---|
| Marion County | 82% |
| Clinton County | 18% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Illinois's 12th congressional district (IL-12) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-12) | Mike Bost (R) | 202-225-5661 | 100% |
| 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 55) | Jason Plummer (R) | 618-283-3000 | 100% |
| State Representative (State House District 110) | Blaine Wilhour (R) | 100% |
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
- Centralia laws: search for the Centralia, Illinois code of ordinances
- Marion County website: https://marioncountyil.gov/
- Marion County laws: search for the Marion County, Illinois code of ordinances
- Clinton County website: https://clintonco.illinois.gov
- Clinton County laws: search for the Clinton County, Illinois code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 55 | 100% |
| State house district | Share of residents |
|---|---|
| State House District 110 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Centralia: the share of that ZIP's residents living in it.
- 62801 (59%)
Get this in your AI agent
Your agent can get Centralia'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:1712164")
Centralia 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.