ZIP code 61341: Marseilles, IL
ZIP code 61341 is in Marseilles (60% of residents) and Seneca (1.1%), in LaSalle County, Illinois. 39% of its residents live outside city limits. It is in Illinois's 14th congressional district (88%) and Illinois's 16th congressional district (12%). Its state senate districts are State Senate District 38 (78%) and State Senate District 53 (22%); its state house districts are State House District 76 (43%), State House District 75 (35%) and State House District 106 (22%).
See it on the mapAll of Illinois
City and county
| City or town | Share of ZIP residents |
|---|---|
| Marseilles | 60% |
| Seneca | 1.1% |
| County | Share of ZIP residents |
|---|---|
| LaSalle County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Manlius township | 47% |
| Rutland township | 37% |
| Fall River township | 6.0% |
| Brookfield township | 5.6% |
| Miller township | 3.4% |
| Grand Rapids township | 0.6% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Illinois's 14th congressional district (IL-14) | 88% |
| Illinois's 16th congressional district (IL-16) | 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.
Members of Congress
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-14) | Lauren Underwood (D) | 202-225-2976 | 88% |
| U.S. Representative (IL-16) | Darin LaHood (R) | 202-225-6201 | 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 |
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 38 | 78% |
| State Senate District 53 | 22% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 76 | 43% |
| State House District 75 | 35% |
| State House District 106 | 22% |
Voting precincts
11 voting precincts overlap ZIP 61341. 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:61341")
ZIP 61341 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.