Area Code 319-231 located in CEDAR FALLS, BLACK HAWK, IA, more detail is as below. Place NPA (Numbering Plan Area) : 319 NXX (Local Number Prefix) : 231 City : CEDAR FALLS County : BLACK HAWK State : IA (Iowa) NXX Use Type : Wireless NXX Intro Version : 1997-01-11 FIPS (Federal Information Processing Standards) : 19013 LATA (Local Access Transport Area) : 635 Rate Center : WATERLOO ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 50613 Other Information NPANXX : 319231 County Population : 0 Switch CLLI (Common Language Location Identifier) : CDRRIATSCM0 MSA CBSA (Core Based Statistical Area) : Waterloo-Cedar Falls, IA MSA CBSA Code (Core Based Statistical Area) : 47940 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : UNITED STATES CELLULAR CORP. - IOWA OCN (Operating Company Number) : 6266 Coverage Area Name : WATERLOO Latitude : 42.4900 Longitude : -92.3439 ‹ previous : 319-230 next › : 319-232 Telephone Number List 319-231-0000 ~ 319-231-9999