Area Code 309-873 located in MONMOUTH, WARREN, IL, more detail is as below. Place NPA (Numbering Plan Area) : 309 NXX (Local Number Prefix) : 873 City : MONMOUTH County : WARREN State : IL (Illinois) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 17187 LATA (Local Access Transport Area) : 977 Rate Center : GULFPORT ZIP Code Count : 21 ZIP Code Frequency : 7 ZIP Code : 61462 Other Information NPANXX : 309873 County Population : 0 Switch CLLI (Common Language Location Identifier) : GLPTILXDRS0 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 : CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL OCN (Operating Company Number) : 1183 Coverage Area Name : CARMAN Latitude : 40.8161 Longitude : -91.0290 ‹ previous : 309-873 next › : 309-873 Telephone Number List 309-873-0000 ~ 309-873-9999