Area Code 309-221 located in GALESBURG, KNOX, IL, more detail is as below. Place NPA (Numbering Plan Area) : 309 NXX (Local Number Prefix) : 221 City : GALESBURG County : KNOX State : IL (Illinois) NXX Use Type : Wireless NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 17095 LATA (Local Access Transport Area) : 977 Rate Center : GALESBURG ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 61401 Other Information NPANXX : 309221 County Population : 0 Switch CLLI (Common Language Location Identifier) : GLBGILXDCM1 MSA CBSA (Core Based Statistical Area) : Galesburg, IL MSA CBSA Code (Core Based Statistical Area) : 23660 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 : GALESBURG Latitude : 40.9517 Longitude : -90.3686 ‹ previous : 309-220 next › : 309-222 Telephone Number List 309-221-0000 ~ 309-221-9999