ZIP 13665 falls in Lewis County, New York, where we hold 10,045 parcels measured as septic county-wide and 2,592 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 13665.
ZCTA 13665 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) |
|---|---|---|---|---|
| Lewis County, New York | 81% | 140 | 10,045 | 2,592 |
| Jefferson County, New York | 19% | — | — | — |
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 10,045 parcels measured as septic for Lewis County, New York as a whole, not broken out by ZIP.
ZIP 13665 spans 2 counties: Lewis County, New York, Jefferson County, New York.