Area Code 860-321 located in FARMINGTON, HARTFORD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 860 NXX (Local Number Prefix) : 321 City : FARMINGTON County : HARTFORD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1997-04-01 FIPS (Federal Information Processing Standards) : 09003 LATA (Local Access Transport Area) : 920 Rate Center : FARMINGTON ZIP Code Count : 3 ZIP Code Frequency : 100 ZIP Code : 06032 Other Information NPANXX : 860321 Switch CLLI (Common Language Location Identifier) : HRFRCTASDS0 MSA CBSA (Core Based Statistical Area) : Hartford-West Hartford-East Hartford, CT MSA CBSA Code (Core Based Statistical Area) : 25540 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : MCIMETRO ACCESS TRANSMISSION SERVICES LLC OCN (Operating Company Number) : 7229 Coverage Area Name : HARTFORD Latitude : 41.7677 Longitude : -72.6778 ‹ previous : 860-320 next › : 860-322 Telephone Number List 860-321-0000 ~ 860-321-9999