ZIP 55923 falls in Fillmore County, Minnesota, where we hold 4,866 parcels measured as septic county-wide and 5,279 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 55923.
ZCTA 55923 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) |
|---|---|---|---|---|
| Fillmore County, Minnesota | 50% | — | 4,866 | 5,279 |
| Olmsted County, Minnesota | 46% | — | 8,501 | 38,509 |
| Winona County, Minnesota | 3% | — | 4,512 | 11,875 |
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 4,866 parcels measured as septic for Fillmore County, Minnesota as a whole, not broken out by ZIP.
ZIP 55923 spans 3 counties: Fillmore County, Minnesota, Olmsted County, Minnesota, Winona County, Minnesota.