Area Code 872-666 located in CHICAGO, COOK, IL, more detail is as below. Place NPA (Numbering Plan Area) : 872 NXX (Local Number Prefix) : 666 City : CHICAGO County : COOK State : IL (Illinois) NXX Use Type : Landline NXX Intro Version : 11/9/2010 FIPS (Federal Information Processing Standards) : 17031 LATA (Local Access Transport Area) : 358 Rate Center : CHICGOZN09 ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 60628 Other Information NPANXX : 872666 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 Overlay : L Company : CYGNUS TELECOMMUNICATIONS CORPORATION - IL OCN (Operating Company Number) : 161F Coverage Area Name : CHICAGO Latitude : 41.7070 Longitude : -87.5612 ‹ previous : 872-639 next › : 872-702 Telephone Number List 872-666-0000 ~ 872-666-9999