ZIP 56309 falls in Grant County, Minnesota, where we hold 2,004 parcels measured as septic county-wide and 1,367 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 56309.
ZCTA 56309 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) |
|---|---|---|---|---|
| Grant County, Minnesota | 56% | 1 | 2,004 | 1,367 |
| Otter Tail County, Minnesota | 38% | — | 23,455 | 9,507 |
| Douglas County, Minnesota | 6% | — | 7,755 | 9,661 |
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 2,004 parcels measured as septic for Grant County, Minnesota as a whole, not broken out by ZIP.
ZIP 56309 spans 3 counties: Grant County, Minnesota, Otter Tail County, Minnesota, Douglas County, Minnesota.