| City: | Holtsville, New York |
| Names to Avoid: | Internal Revenue Service |
| County: | Suffolk County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 7:40:53 PM |
| Population: | No Population Data |
| Area Codes: | 631 / 934 |
| Classification: | Unique [Company/Government] |
| Coordinates: | 40.7877, -73.0393 |
| Quick Link: |
The Internal Revenue Service operates from ZIP code 00501 in Holtsville, Suffolk County, New York. This is the lowest ZIP code number in the continental United States, a piece of postal trivia that draws attention to an otherwise routine federal facility. The IRS Brookhaven Campus at 1040 Waverly Avenue handles tax processing and taxpayer correspondence for the northeastern region.
Postal records show just two delivery codes routing to the IRS facility on Waverly Avenue. The absence of Census population data reflects the commercial nature of this designation, as the facility has no residential component. This unique ZIP has served the IRS since before 2004, predating modern USPS tracking systems. The Taxpayer Advocate Service maintains an office here for resolving taxpayer issues.
| Establishments: | 4 |
| Employment: | 39 |
| Residential: | 0 |
| Business: | 1 |
Buildings registered in the USPS ZIP+4 database with designated codes for direct mail delivery.
ZIP Code 00501 is assigned to a single organization or institution. Detailed business demographics are not published for unique ZIP Codes. USPS data shows 0 residential mailboxes and 1 business mailboxes, reflecting local delivery coverage.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 1Source: USPS |
| Total Delivery Receptacles: | 1Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 5Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $526,000Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 00501 is located in Suffolk County, New York, within the New York-Newark-Jersey City, NY-NJ Metropolitan Statistical Area (CBSA 35620) and New York's 2nd Congressional District. This Metro area has a population of 18,897,109 people, about 0.00% of whom live in ZIP Code 00501, and is subdivided into the Nassau County-Suffolk County, NY division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | New York-Newark-Jersey City, NY-NJSource: Census |
| CBSA Number: | 35620Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Nassau County-Suffolk County, NY (CBSA Div 35004)Source: Census |
| CBSA Population: | 18,897,109Source: Census |
| MSA: | New York-Northern New Jersey-Long Island, NY-NJ-CT-PASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 182.01 sq miSource: Census |
| PMSA: | Nassau-Suffolk, NY PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 3635254Source: Census |
| Place Name: | Holtsville CDP; New YorkSource: Census |
We could not locate which school district 00501 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.