ZIP code 56257: Marietta, MN
ZIP code 56257 is in Marietta (28% of residents) and Nassau (15%), in Lac qui Parle County (97%) and Deuel County (2.9%), Minnesota. 57% of its residents live outside city limits. It is in Minnesota's 7th congressional district (97%) and South Dakota's at-large congressional district (2.9%). Its state senate districts are State Senate District 15 (97%) and State Senate District 4 (2.9%); its state house districts are State House District 15A (97%) and State House District 4 (2.9%).
See it on the mapAll of Minnesota
City and county
| City or town | Share of ZIP residents |
|---|---|
| Marietta | 28% |
| Nassau | 15% |
| County | Share of ZIP residents |
|---|---|
| Lac qui Parle County | 97% |
| Deuel County | 2.9% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Marietta city | 28% |
| Augusta township | 19% |
| Mehurin township | 17% |
| Nassau city | 15% |
| Walter township | 8.6% |
| Garfield township | 5.9% |
| Manfred township | 4.3% |
| Antelope Valley township | 2.9% |
| Freeland township | land only |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Minnesota's 7th congressional district (MN-07) | 97% |
| South Dakota's at-large congressional district (SD-AL) | 2.9% |
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 (MN-07) | Michelle Fischbach (R) | 202-225-2165 | 97% |
| U.S. Representative (SD-AL) | Dusty Johnson (R) | 202-225-2801 | 2.9% |
| U.S. Senator | Amy Klobuchar (D) | 202-224-3244 · contact form | statewide |
| U.S. Senator | Tina Smith (D) | 202-224-5641 · contact form | statewide |
| State Senator (State Senate District 15) | Gary Dahms (R) | 97% | |
| State Senator (State Senate District 4) | Stephanie Sauder (R) | 2.9% | |
| State Representative (State House District 15A) | Chris Swedzinski (R) | 507-829-7754 | 97% |
| State Representative (State House District 4) | Dylan Jordan (R) | 2.9% | |
| State Representative (State House District 4) | Kent Roe (R) | 2.9% |
Elected under MN's previous legislative map; the district's lines changed for 2026.
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
- Marietta laws: search for the Marietta, Minnesota code of ordinances
- Nassau laws: search for the Nassau, Minnesota code of ordinances
- Lac qui Parle County website: http://lqpco.com/
- Lac qui Parle County laws: search for the Lac qui Parle County, Minnesota code of ordinances
- Deuel County website: https://www.deuelcountysd.com/
- Deuel County laws: search for the Deuel County, Minnesota code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 15 | 97% |
| State Senate District 4 | 2.9% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 15A | 97% |
| State House District 4 | 2.9% |
Voting precincts
9 voting precincts overlap ZIP 56257. It also crosses into SD. 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:56257")
ZIP 56257 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.