Area Code 312-288 located in CHICAGO, COOK, IL, more detail is as below. Place NPA (Numbering Plan Area) : 312 NXX (Local Number Prefix) : 288 City : CHICAGO County : COOK State : IL (Illinois) NXX Use Type : Landline NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 17031 LATA (Local Access Transport Area) : 358 Rate Center : CHICGOZN01 ZIP Code Count : 1 ZIP Code Frequency : 25 ZIP Code : 60604 Other Information NPANXX : 312288 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHCGILWJDS0 MSA CBSA (Core Based Statistical Area) : Chicago-Naperville-Joliet, IL-IN-WI MSA CBSA Code (Core Based Statistical Area) : 16980 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : MCIMETRO ACCESS TRANSMISSION SERVICES LLC OCN (Operating Company Number) : 7229 Coverage Area Name : CHICAGO Latitude : 41.8858 Longitude : -87.6286 ‹ previous : 312-288 next › : 312-288 Telephone Number List 312-288-0000 ~ 312-288-9999