Area Code 563-423 located in POSTVILLE, ALLAMAKEE, IA, more detail is as below. Place NPA (Numbering Plan Area) : 563 NXX (Local Number Prefix) : 423 City : POSTVILLE County : ALLAMAKEE State : IA (Iowa) NXX Use Type : Landline NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 19005 LATA (Local Access Transport Area) : 635 Rate Center : CLERMONT ZIP Code Count : 25 ZIP Code Frequency : 4 ZIP Code : 52162 Other Information NPANXX : 563423 County Population : 0 Switch CLLI (Common Language Location Identifier) : CLMTIAXODS0 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : ACE TELEPHONE ASSOCIATION - IOWA OCN (Operating Company Number) : 1346 Coverage Area Name : CLERMONT Latitude : 43.0011 Longitude : -91.6541 ‹ previous : 563-423 next › : 563-423 Telephone Number List 563-423-0000 ~ 563-423-9999