Area Code 301-878 located in BALTIMORE, BALTIMORE CITY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 301 NXX (Local Number Prefix) : 878 City : BALTIMORE County : BALTIMORE CITY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 24510 LATA (Local Access Transport Area) : 238 ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 21201 Other Information NPANXX : 301878 County Population : 0 Switch CLLI (Common Language Location Identifier) : BLTMMDCH1DD 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 : BALTIMORE Latitude : 39.2938 Longitude : -76.6132 ‹ previous : 301-877 next › : 301-878 Telephone Number List 301-878-0000 ~ 301-878-9999