ZIP 50601 falls in Franklin County, Iowa, where we hold 132 septic-related documents. We have not classified septic-versus-sewer status for this county, and we do not have a per-ZIP parcel count -- see the county page for what we hold and where the records are kept.
ZCTA 50601 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) |
|---|---|---|---|---|
| Franklin County, Iowa | 36% | 132 | — | — |
| Hardin County, Iowa | 30% | 154 | — | — |
| Butler County, Iowa | 18% | 154 | — | — |
| Grundy County, Iowa | 16% | 132 | — | — |
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 50601 spans 4 counties: Franklin County, Iowa, Hardin County, Iowa, Butler County, Iowa, Grundy County, Iowa.