Area Code 410-321 located in TOWSON, BALTIMORE, MD, more detail is as below. Place NPA (Numbering Plan Area) : 410 NXX (Local Number Prefix) : 321 City : TOWSON County : BALTIMORE State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 24005 LATA (Local Access Transport Area) : 238 Rate Center : TOWSON ZIP Code Count : 839 ZIP Code Frequency : 30 ZIP Code : 21204 Other Information NPANXX : 410321 Switch CLLI (Common Language Location Identifier) : TWSNMDTWDS0 MSA CBSA (Core Based Statistical Area) : Baltimore-Towson, MD MSA CBSA Code (Core Based Statistical Area) : 12580 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : TOWSON Latitude : 39.4002 Longitude : -76.6035 ‹ previous : 410-320 next › : 410-321 Telephone Number List 410-321-0000 ~ 410-321-9999