Area Code 240-324 located in HIGHLAND, HOWARD, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 324 City : HIGHLAND County : HOWARD State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 10/8/2008 FIPS (Federal Information Processing Standards) : 24027 LATA (Local Access Transport Area) : 238 Rate Center : ASHTON238 ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 20777 Other Information NPANXX : 240324 County Population : 0 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 Overlay : L Company : YMAX COMMUNICATIONS CORP. - MD OCN (Operating Company Number) : 281E Coverage Area Name : CLARKSVILLE Latitude : 39.2119 Longitude : -76.9473 ‹ previous : 240-323 next › : 240-325 Telephone Number List 240-324-0000 ~ 240-324-9999