ZIP 56557 falls in Mahnomen County, Minnesota. We have not measured septic data for this county yet. The county page below has what we do know: where records are kept and whether the portal is public.
ZCTA 56557 is not entirely inside one county. Land-area share is from the 2020 Census ZCTA-to-county relationship file.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Mahnomen County, Minnesota | 93% | — | — | — |
| Norman County, Minnesota | 4% | — | 2,124 | 1,421 |
| Clearwater County, Minnesota | 3% | 91 | 2,962 | 929 |
Land-area overlap is from the 2020 Census Bureau ZCTA5-to-county relationship file, not an estimate of ours. Parcel and document counts are rows we hold, not a survey of every property in the ZIP. Last verified 2026-09-01.
We have not measured septic-versus-sewer status for this county yet.
ZIP 56557 spans 3 counties: Mahnomen County, Minnesota, Norman County, Minnesota, Clearwater County, Minnesota.