| City: | Holtsville, New York |
| Names to Avoid: | Internal Revenue Service |
| County: | Suffolk County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 3:58:09 PM |
| Population: | No Population Data |
| Area Codes: | 631 / 934 |
| Classification: | Unique [Company/Government] |
| Coordinates: | 40.7888, -73.0394 |
| Quick Link: |
ZIP code 00544 serves as an auxiliary Internal Revenue Service designation in Holtsville, Suffolk County, New York. This code operates alongside the primary IRS ZIP 00501, which houses the Brookhaven Campus on Waverly Avenue. The IRS uses multiple ZIP codes at major processing centers to segregate different mail streams and correspondence types.
Postal records show zero active delivery codes for this designation, indicating it functions as a routing or processing code rather than a physical delivery address. No Census population data exists, consistent with federal administrative functions. The USPS assigned this code prior to 2004.
ZIP Code 00544 is assigned to a single organization or institution. Detailed business demographics are not published for unique ZIP Codes.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 0Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 00544 is located in Suffolk County, New York, within the New York-Newark-Jersey City, NY-NJ Metropolitan Statistical Area (CBSA 35620). This Metro area has a population of 19,756,722 people, about 0.00% of whom live in ZIP Code 00544, 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: | 19,756,722Source: Census |
| MSA: | New York-Northern New Jersey-Long Island, NY-NJ-CT-PASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | No DistrictsSource: USPS |
| Congressional Land Area: | 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 00544 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 December 1, 2025.