Area Code 240-236 located in FREDERICK, FREDERICK, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 236 City : FREDERICK County : FREDERICK State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 2000-06-13 FIPS (Federal Information Processing Standards) : 24021 LATA (Local Access Transport Area) : 240 Rate Center : FREDERICK ZIP Code Count : 7 ZIP Code Frequency : 21 ZIP Code : 21701 Other Information NPANXX : 240236 County Population : 0 Switch CLLI (Common Language Location Identifier) : FRDRMDFRDS0 MSA CBSA (Core Based Statistical Area) : Washington-Arlington-Alexandria, DC-VA-MD-WV MSA CBSA Code (Core Based Statistical Area) : 47900 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Overlay : L Company : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : FREDERICK Latitude : 39.4148 Longitude : -77.4123 ‹ previous : 240-236 next › : 240-237 Telephone Number List 240-236-0000 ~ 240-236-9999