Six Gulfport place-name ZIPs
Gulfport mail does not share one citywide five-digit code. Filtering GeoNames' US postal-code export (CC BY 4.0, retrieved 2026-08-03) to place=Gulfport and state=Mississippi yields six rows: 39501, 39502, 39503, 39505, 39506 and 39507.
Delivery type and population figures below come from zip-codes.com's Gulfport city page, which lists the same six codes as three Standard and three P.O. Box assignments and shows a data-last-updated date of October 1, 2026 (zip-codes.com: Gulfport, MS, read 2026-10-21).
All six GeoNames rows sit in Harrison County on Mississippi's Gulf Coast. That is the county field you should put on forms that ask for county alongside a Gulfport street ZIP.
ZIP codes with primary place name Gulfport, MS (GeoNames US postal export, retrieved 2026-08-03; type, aliases and population from zip-codes.com, read 2026-10-21)
| ZIP | County (GeoNames) | Type | Population | Aliases listed |
|---|---|---|---|---|
| 39501 | Harrison | Standard | 22,599 | US Nav Const Batt |
| 39502 | Harrison | P.O. Box | 0 | |
| 39503 | Harrison | Standard | 53,643 | Orange Grove |
| 39505 | Harrison | P.O. Box | 0 | |
| 39506 | Harrison | P.O. Box | 0 | |
| 39507 | Harrison | Standard | 17,724 |
Which code for a street address
Use 39501, 39503 or 39507 for street delivery. By listed population, 39503 is by far the largest residential code (about 53,600), covering inland and Orange Grove areas that still carry the Gulfport place name. 39501 covers older central and harbor-adjacent tracts; zip-codes.com also lists an alias pointing at the Naval Construction Battalion Center. 39507 is the third Standard code.
39502, 39505 and 39506 are P.O. Box codes with zero residential population in that table. They still show Gulfport as the place name in GeoNames, but they are not street-delivery ZIPs. If a form rejects your entry, check whether you mixed a box ZIP with a street address.
Orange Grove on 39503 is an alias, not a second county. The GeoNames county column stays Harrison for every Gulfport row in this extract. Inland Orange Grove addresses still mail as Gulfport under 39503 when that is the USPS assignment; do not invent a separate Orange Grove city ZIP that is absent from this place-name list.
The "US Nav Const Batt" alias on 39501 points at the Naval Construction Battalion Center (Seabee) mail stream that directories attach to that code. It does not create a second civilian city. Residential and commercial street delivery still use the Standard codes above; if a form only accepts a Seabee or base ZIP, use whatever the installation or USPS record prints.
Biloxi sits next door on the same Harrison County coast and has its own ZIP set. Coastal addresses near the municipal line are easy to mis-file: a Biloxi street should not receive a Gulfport 3950x code copied from this table. Run USPS ZIP Code Lookup on the full street line, then keep Harrison as the county when the tool returns one of the six Gulfport rows.
Area code and related pages
Gulfport phone numbers use area code 228, established September 15, 1997 as a split of 601, covering Gulfport, Biloxi, Pascagoula, Bay St. Louis and the southmost part of Mississippi according to DialWick's area-code dataset. ZIP boundaries and area-code boundaries are maintained separately.
For another multi-ZIP city list built from the same GeoNames export, see Chesapeake VA ZIP codes. For how a US ZIP differs from other postal-code systems, see postal code vs ZIP code.