ZIP 10509 falls in Putnam County, New York, where we hold 25,810 parcels measured as septic county-wide and 5,109 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 10509.
ZCTA 10509 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) |
|---|---|---|---|---|
| Putnam County, New York | 100% | 1,835 | 25,810 | 5,109 |
| Westchester County, New York | 0% | 11 | 34,110 | 167,300 |
1 businesses on record with an address in this ZIP: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
| Company | City | Phone | Rating |
|---|---|---|---|
| C Gallagher Contracting | Brewster | (347) 865-7829 | — |
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 25,810 parcels measured as septic for Putnam County, New York as a whole, not broken out by ZIP.
ZIP 10509 spans 2 counties: Putnam County, New York, Westchester County, New York.