Indiana | Illinois | Michigan Overlay vs Split Why splits are the best relief for large area codes Why overlays are the best relief for small area codes Indiana Area Code Map Indiana Area Code History Northern Indiana (219, 260, 574) Central Indiana (317, 463, 765) Southern Indiana (812, 930) Special Feature 1965 - GTE Richmond Central Office Fire (regular or frames) Special Reports 1997 - Indiana's 317/765 Split 2002 - Indiana's 219/260/574 Split 2015 - Indiana's 812/930 Overlay 2016 - Indiana's 317/463 Overlay Future Relief 2032? - Indiana 765/634? Relief At least 30 years ... - Indiana 260/834? Relief - Indiana 219/943? Relief - Indiana 574/665? Relief Future NPA numbers 765, 574, 930 and 463 were 1) taken from an accidentally published working document, 2) absolutely not official, 3) subject to change and 100% accurate. Future NPA numbers 634, 665, 834 and 943 are predicted.   Chicago Illinois   The Chicago area has moved from one area code (312) in 1988 to eight area codes with plans for a ninth (expected in 2015). Northern Illinois (815) has been overlaid and there are plans in place to overlay central Illinois (217) and southern Illinois (618). Illinois Area Code Map Chicago Area Code History Michigan   Michigan has moved from four area codes in 1961 to twelve in 2002. The last change in Michigan was the split of area code 269 from 616 in 2002. Michigan has only one overlay area code (947 overlaid 248 in 2002). Michigan Area Code History Western Michigan (231, 269, 616, 906) Central Michigan (517, 989) Eastern Michigan (248, 313, 586, 734, 810, 947) Special Report 2002 - Michigan's 616/269 Split Future Relief 2021 - Michigan 313/679? Overlay 2023 - Michigan 586 Relief 2023 - Michigan 734/278? Overlay 2023 - Michigan 989 Relief 2029 - Michigan 517 Relief 2033 - Michigan 616 Relief 2037 - Michigan 231 Relief 2037 - Michigan 269 Relief At least 30 years ... - Michigan 906 Relief - Michigan 810 Relief - Michigan 248/947 Relief Other NANP Sites NANPA Official Site http://www.nanpa.com/ TRA Official Site http://www.trainfo.com/ The FCC Homepage http://www.fcc.gov/   More Telecom Sites Linc Madison's LincMad's Telecom Page Telecom DIGEST Archives and Recent Issues usenet news:comp.dcom.telecom   Beyond the NANP David Liebold's World Telephone Numbering Guide Telecom Beyond NANP Expansion 'Longer than 10 digit numbers' My Plan for moving from 7D/10D to 8D/12D Wireless Overview Introducing Verizon Wireless - America's First Mega-Carrier Wireless Spectrum and Licencing @TK.COM

Written / Compiled for Telecom Indiana Contact the Author James Bellaire <bellaire@tk.com> Hosted by Agathon Group Good people, great service.