ZIP 12166 falls in Montgomery County, New York, where we hold 8,249 parcels measured as septic county-wide and 9,376 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 12166.
ZCTA 12166 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) |
|---|---|---|---|---|
| Montgomery County, New York | 98% | — | 8,249 | 9,376 |
| Schoharie County, New York | 2% | 9 | — | — |
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 8,249 parcels measured as septic for Montgomery County, New York as a whole, not broken out by ZIP.
ZIP 12166 spans 2 counties: Montgomery County, New York, Schoharie County, New York.