ZIP 51436 falls in Carroll County, Iowa, where we hold 74 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 51436 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) |
|---|---|---|---|---|
| Carroll County, Iowa | 68% | 74 | — | — |
| Crawford County, Iowa | 18% | 91 | — | — |
| Sac County, Iowa | 13% | 56 | — | — |
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 51436 spans 3 counties: Carroll County, Iowa, Crawford County, Iowa, Sac County, Iowa.