ZIP code 61231: Aledo, IL
ZIP code 61231 is in Aledo (69% of residents) and Preemption (1.3%), in Mercer County, Illinois. 30% of its residents live outside city limits. It is in Illinois's 15th congressional district (88%) and Illinois's 17th congressional district (12%). Its state senate districts are State Senate District 47 (97%) and State Senate District 36 (2.5%); its state house districts are State House District 94 (97%) and State House District 71 (2.5%).
See it on the mapAll of Illinois
City and county
| City or town | Share of ZIP residents |
|---|---|
| Aledo | 69% |
| Preemption | 1.3% |
| Millersburg | 0.7% |
| County | Share of ZIP residents |
|---|---|
| Mercer County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Mercer township | 75% |
| Preemption township | 6.7% |
| Perryton township | 4.2% |
| Greene township | 3.1% |
| Ohio Grove township | 3.1% |
| Millersburg township | 2.7% |
| Duncan township | 2.6% |
| Suez township | 2.5% |
| Abington township | <0.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Illinois's 15th congressional district (IL-15) | 88% |
| Illinois's 17th congressional district (IL-17) | 12% |
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-15) | Mary E. Miller (R) | 202-225-5271 | 88% |
| U.S. Representative (IL-17) | Eric Sorensen (D) | 202-225-5905 | 12% |
| 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 47) | Neil Anderson (R) | 309-230-7584 | 97% |
| State Senator (State Senate District 36) | Mike Halpin (Democratic) | 309-558-3612 | 2.5% |
| State Representative (State House District 94) | Norine Hammond (R) | 309-836-2707 | 97% |
| State Representative (State House District 71) | Dan Swanson (R) | 2.5% |
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
- Aledo laws: search for the Aledo, Illinois code of ordinances
- Preemption laws: search for the Preemption, Illinois code of ordinances
- Mercer County website: http://www.mercercountyil.org
- Mercer County laws: search for the Mercer County, Illinois code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 47 | 97% |
| State Senate District 36 | 2.5% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 94 | 97% |
| State House District 71 | 2.5% |
Voting precincts
15 voting precincts overlap ZIP 61231. 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:61231")
ZIP 61231 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.