Indiana | Illinois | Michigan

Michigan: Western (231, 269, 616, 906) Central (517, 989) Eastern (248, 313, 586, 734, 810, 947)

Michigan

Original 1947 Area Codes
Area Code 313 - Detroit and eastern Michigan.
Area Code 517 - Lansing and central Michigan.
Area Code 616 - Grand Rapids, western Michigan and upper Michigan.
(Note: Area code borders were adjusted over the years including major shifts in 1961.)

January 1961 - Area Code 906 split from 616

The 906 area code became effective in January 1961. Permissive dialing ended in July 1961.
  December 1st, 1993 - Area Code 810 split from 313

The 810 area code became effective on December 1st, 1993. Permissive dialing ended August 10th, 1994.
 
May 10th, 1997 - Area Code 248 split from 810

The 248 area code became effective on May 10th, 1997. Permissive dialing ended September 13th, 1997.
  December 13th, 1997 - Area Code 734 split from 313

The 734 area code became effective on December 13th, 1997. Permissive dialing ended July 25th, 1998.
 
June 5th, 1999 - Area Code 231 split from 616

The 231 area code became effective on June 5th, 1999. Permissive dialing ended October 2nd, 1999. Permissive dialing to wireless numbers ended October 2nd, 2000.
  August 19th, 2000 - Area Code 989 split from 517

The 989 area code became effective on August 19th, 2000. Permissive dialing ended January 20th, 2001.
 
September 22nd, 2001 - Area Code 586 split from 810

The 586 area code became effective on September 22nd, 2001. Permissive dialing ended March 23rd, 2002. Permissive dialing to wireless numbers ended March 22nd, 2003.
  January 26th, 2002 - Area Code 947 overlaid on 248

Permissive 10 digit dialing to 248 area code numbers began January 26th, 2002 and ended (after an extension) on September 7th, 2002.
 
July 13th, 2002 - Area Code 269 split from 616

The 269 area code became effective on July 13th, 2002. Permissive dialing ended February 15th, 2003. Permissive dialing to wireless numbers ended February 15th, 2004.
  The Future

Further area code splits or overlays are expected as follows:
Estimated October 2016

313 - Spring 2021 (overlay 679)
586 - Spring 2023
734 - Late 2023 (overlay 278)
989 - Late 2023
517 - Fall 2029
616 - Early 2033
231 - Early 2037
269 - Late 2037
906 - more than 30 years
810 - more than 30 years
248/947 - more than 30 years
 

Written / Compiled for Telecom Michigan
a part of Telecom Indiana