Area Code 571-203 located in HERNDON, FAIRFAX, VA, more detail is as below. Place NPA (Numbering Plan Area) : 571 NXX (Local Number Prefix) : 203 City : HERNDON County : FAIRFAX State : VA (Virginia) NXX Use Type : Landline NXX Intro Version : 2000-10-31 FIPS (Federal Information Processing Standards) : 51059 LATA (Local Access Transport Area) : 236 Rate Center : HERNDON ZIP Code Count : 67 ZIP Code Frequency : 33 ZIP Code : 20170 Other Information NPANXX : 571203 County Population : 0 Switch CLLI (Common Language Location Identifier) : HRNDVAHEDS0 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 VIRGINIA, INC. OCN (Operating Company Number) : 9213 Coverage Area Name : HERNDON Latitude : 38.9639 Longitude : -77.3981 ‹ previous : 571-203 next › : 571-204 Telephone Number List 571-203-0000 ~ 571-203-9999