00501

00501 is a United States ZIP code associated with the Internal Revenue Service (IRS) in Holtsville, New York. It is a non-geographic ZIP code used for centralized mail processing and P.O. Box services rather than for a conventional residential or geographic area.

Location and designation

The code is linked to an IRS facility in Holtsville, located in Suffolk County on Long Island. As a non-geographic ZIP, 00501 does not correspond to a standard street-addressed community, but rather to a dedicated IRS mail processing operation.

Function and use

00501 serves mail related to IRS operations, including P.O. Box correspondence and certain tax payment remittances. It enables centralized handling of mail for the agency, separating it from routine postal routes used by the general public. Individuals and businesses typically encounter this ZIP in tax-related communications rather than in everyday postal use.

History and status

The ZIP code was created to support the IRS’s centralized mail processing needs. It is used exclusively by the IRS and is not intended for general residential delivery. Because it is a non-geographic code, it is uncommon among standard ZIPs and is often noted specifically in the context of tax administration.

See also

ZIP code; Internal Revenue Service; Holtsville, New York; Long Island.