ZIP 56621 falls in Clearwater County, Minnesota, where we hold 2,962 parcels measured as septic county-wide and 929 on sewer. We do not have a per-ZIP parcel count for this county, so this is the county total, not a count specific to ZIP 56621.
ZCTA 56621 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) |
|---|---|---|---|---|
| Clearwater County, Minnesota | 98% | 91 | 2,962 | 929 |
| Polk County, Minnesota | 2% | — | 8,973 | 3,467 |
| Mahnomen County, Minnesota | 0% | — | — | — |
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 hold 2,962 parcels measured as septic for Clearwater County, Minnesota as a whole, not broken out by ZIP.
ZIP 56621 spans 3 counties: Clearwater County, Minnesota, Polk County, Minnesota, Mahnomen County, Minnesota.