Area Code 410-278 located in HAVRE DE GRACE, HARFORD, MD, more detail is as below. Place NPA (Numbering Plan Area) : 410 NXX (Local Number Prefix) : 278 City : HAVRE DE GRACE County : HARFORD State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 24025 LATA (Local Access Transport Area) : 238 Rate Center : ABERDEEN ZIP Code Count : 1 ZIP Code Frequency : 7 ZIP Code : 21078 Other Information NPANXX : 410278 Switch CLLI (Common Language Location Identifier) : ABRDMDABDS0 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 : ABERDEEN Latitude : 39.5091 Longitude : -76.1677 ‹ previous : 410-278 next › : 410-278 Telephone Number List 410-278-0000 ~ 410-278-9999