Area Code 319-233 located in WATERLOO, BLACK HAWK, IA, more detail is as below. Place NPA (Numbering Plan Area) : 319 NXX (Local Number Prefix) : 233 City : WATERLOO County : BLACK HAWK State : IA (Iowa) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 19013 LATA (Local Access Transport Area) : 635 Rate Center : WATERLOO ZIP Code Count : 1402 ZIP Code Frequency : 24 ZIP Code : 50703 Other Information NPANXX : 319233 County Population : 0 Switch CLLI (Common Language Location Identifier) : WTRLIADTDS1 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 : QWEST CORPORATION OCN (Operating Company Number) : 9631 Coverage Area Name : WATERLOO Latitude : 42.4983 Longitude : -92.3388 ‹ previous : 319-233 next › : 319-233 Telephone Number List 319-233-0000 ~ 319-233-9999