Area Code 309-231 located in EUREKA, WOODFORD, IL, more detail is as below. Place NPA (Numbering Plan Area) : 309 NXX (Local Number Prefix) : 231 City : EUREKA County : WOODFORD State : IL (Illinois) NXX Use Type : Wireless NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 17203 LATA (Local Access Transport Area) : 368 Rate Center : PEORIA ZIP Code Count : 1 ZIP Code Frequency : 25 ZIP Code : 61530 Other Information NPANXX : 309231 County Population : 0 Switch CLLI (Common Language Location Identifier) : PEOSILFQCM0 MSA CBSA (Core Based Statistical Area) : Peoria, IL MSA CBSA Code (Core Based Statistical Area) : 37900 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : UNITED STATES CELLULAR CORP. - ILLINOIS OCN (Operating Company Number) : 6265 Coverage Area Name : PEORIA Latitude : 40.6927 Longitude : -89.5934 ‹ previous : 309-231 next › : 309-232 Telephone Number List 309-231-0000 ~ 309-231-9999