ZIP code 61342: Mendota, IL
ZIP code 61342 is in Mendota (82% of residents), in LaSalle County (98%), Bureau County (1.0%) and Lee County (0.6%), Illinois. 18% of its residents live outside city limits. It is in Illinois's 14th congressional district (99%) and Illinois's 16th congressional district (1.5%). Its state senate district is State Senate District 37; its state house districts are State House District 74 (99%) and State House District 73 (1.4%).
See it on the mapAll of Illinois
City and county
| City or town | Share of ZIP residents |
|---|---|
| Mendota | 82% |
| County | Share of ZIP residents |
|---|---|
| LaSalle County | 98% |
| Bureau County | 1.0% |
| Lee County | 0.6% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Mendota township | 83% |
| Troy Grove township | 12% |
| Ophir township | 2.5% |
| Meriden township | 1.1% |
| Clarion township | 0.8% |
| Sublette township | 0.4% |
| Brooklyn township | 0.2% |
| Westfield township | 0.2% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Illinois's 14th congressional district (IL-14) | 99% |
| Illinois's 16th congressional district (IL-16) | 1.5% |
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.
Members of Congress
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-14) | Lauren Underwood (D) | 202-225-2976 | 99% |
| U.S. Representative (IL-16) | Darin LaHood (R) | 202-225-6201 | 1.5% |
| 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 |
Members serving now (119th Congress, until January 3, 2027). Source: Members of Congress: the @unitedstates project, congress-legislators (CC0).
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 37 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 74 | 99% |
| State House District 73 | 1.4% |
Voting precincts
16 voting precincts overlap ZIP 61342. 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:61342")
ZIP 61342 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.