ZIP Code 00501 — Holtsville, New York
📍 ZIP code 00501 is in Holtsville, Suffolk County, New York.
ZIP code 00501 is a Unique ZIP code assigned by the U.S. Postal Service in Holtsville, Suffolk County, New York. It serves post office boxes at a Holtsville post office rather than street addresses, which is why the Census Bureau reports no resident population, income or housing figures for it. Mail addressed to 00501 is handled in the Eastern Time Zone and the local area code is 631. The demographic profile of the surrounding community is on the standard delivery ZIP pages for Holtsville listed below.
Why there are no demographics for 00501
The Census Bureau publishes demographics for ZIP Code Tabulation Areas (ZCTAs), which are built from populated census blocks. A PO Box ZIP like 00501 has no delivery territory of its own, so there is no ZCTA and no population, income, housing or education estimate to report. This is normal: Suffolk County and the rest of New York have hundreds of PO Box and unique ZIPs of this kind.
For the community around Holtsville, use the delivery ZIPs that do carry Census data:
How ZIPs and ZCTAs differ is explained on the methodology page.
Nearby Zip Codes
Cities & Places Served
ZIP code 00501 primarily serves Holtsville in Suffolk County, New York.