Area Code 228-378 located in GULFPORT, HARRISON, MS, more detail is as below. Place NPA (Numbering Plan Area) : 228 NXX (Local Number Prefix) : 378 City : GULFPORT County : HARRISON State : MS (Mississippi) NXX Use Type : Landline NXX Intro Version : 2000-08-20 FIPS (Federal Information Processing Standards) : 28047 Rate Center : GULFPORT ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 39501 Other Information NPANXX : 228378 County Population : 0 Switch CLLI (Common Language Location Identifier) : GLPTMS55W03 MSA CBSA (Core Based Statistical Area) : Gulfport-Biloxi, MS MSA CBSA Code (Core Based Statistical Area) : 25060 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Latitude : None Longitude : None ‹ previous : 228-378 next › : 228-380 Telephone Number List 228-378-0000 ~ 228-378-9999