Columbia, Illinois
Columbia is a city in Monroe County (98% of residents) and St. Clair County (1.8%), Illinois, with 11,013 residents in 2020. It is in Illinois's 12th congressional district. It spans 2 state senate and 2 state house districts.
County
| County | Share of residents |
|---|---|
| Monroe County | 98% |
| St. Clair County | 1.8% |
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 58) | Terri Bryant (R) | 618-472-8158 | 98% |
| State Senator (State Senate District 57) | Christopher Belt (Democratic) | 618-875-1212 | 1.8% |
| State Representative (State House District 115) | David Friess (R) | 618-282-7284 | 98% |
| State Representative (State House District 114) | Kevin Schmidt (R) | 618-215-1050 | 1.8% |
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
- Columbia website: http://www.columbiaillinois.com/
- Columbia laws: search for the Columbia, Illinois code of ordinances
- Monroe County website: http://www.monroecountyil.org
- Monroe County laws: search for the Monroe 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 58 | 98% |
| State Senate District 57 | 1.8% |
| State house district | Share of residents |
|---|---|
| State House District 115 | 98% |
| State House District 114 | 1.8% |
ZIP codes
Percentages mark ZIPs only partly in Columbia: the share of that ZIP's residents living in it.
- 62236 (79%)
Get this in your AI agent
Your agent can get Columbia'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:1715833")
Columbia 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.