ZIP code 61818: Cerro Gordo, IL
ZIP code 61818 is in Cerro Gordo (85% of residents), in Piatt County (96%) and Macon County (4.4%), Illinois. 15% of its residents live outside city limits. It is in Illinois's 13th congressional district (97%) and Illinois's 15th congressional district (2.5%). Its state senate district is State Senate District 44; its state house district is State House District 88.
See it on the mapAll of Illinois
City and county
| City or town | Share of ZIP residents |
|---|---|
| Cerro Gordo | 85% |
| County | Share of ZIP residents |
|---|---|
| Piatt County | 96% |
| Macon County | 4.4% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Cerro Gordo township | 93% |
| Oakley township | 3.0% |
| Willow Branch township | 2.2% |
| Long Creek township | 1.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Illinois's 13th congressional district (IL-13) | 97% |
| Illinois's 15th congressional district (IL-15) | 2.5% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-13) | Nikki Budzinski (D) | 202-225-2371 | 97% |
| U.S. Representative (IL-15) | Mary E. Miller (R) | 202-225-5271 | 2.5% |
| 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 44) | Sally Turner (R) | 217-651-8291 | 100% |
| State Representative (State House District 88) | Regan Deering (R) | 217-876-1968 | 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
- Cerro Gordo laws: search for the Cerro Gordo, Illinois code of ordinances
- Piatt County laws: search for the Piatt County, Illinois code of ordinances
- Macon County website: https://maconcounty.illinois.gov/
- Macon County laws: search for the Macon County, Illinois code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 44 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 88 | 100% |
Voting precincts
6 voting precincts overlap ZIP 61818. 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:61818")
ZIP 61818 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.