Beginning in 1923, intrastate bus service was regulated by the Michigan Public Utilities Commission, later the Michigan Public Service Commission. Information could not be located, regarding the issuance of Certificates of Convenience and Necessity for bus service. But the December 1922 issue of the publication "Bus Transportation" included a table listing the bus routes in existence in Michigan.
Not listed are city bus routes, along with bus routes of a suburban nature operating strictly within one county.
This information does not include the actual bus companies operating most of the routes. For most routes it was not possible, to establish how these companies became part of the Greyhound or other larger bus companies.
Early Bus Routes Serving Detroit
Some of the earliest bus routes in Michigan operated out of Detroit, and were of both a suburban and intercity nature. This system evolved to Great Lakes Greyhound Lines, which for many years continued to operate suburban bus services which eventually became part of the public SEMTA later SMART system.
Adrian-Toledo OH Albion-Homer Albion-Montpelier OH Alma-Mt. Pleasant Alma-St. Johns Alpena-Rogers Ann Arbor-Adrian-Morenci Battle Creek-Coldwater Battle Creek-Colon Battle Creek-Hastings Battle Creek-Lansing Battle Creek-Marshall Bay City-Midland-Gladwin Bay City-Standish-Prescott Bay City-Saginaw Benton Harbor-Hartford Benton Harbor-South Haven Big Rapids-White Cloud Buchanan-South Bend IN Cass City-Imlay City Cassopolis-South Bend IN Coldwater-Marshall Coldwater-Sturgis Detroit-Ann Arbor Detroit-Flint Detroit-Lansing Detroit-Ypsilanti Dowagiac-South Bend IN Flint-Davison Flint-Byron Flint-Vassar-Caro Flint-Durand Flint-Owosso Grand Rapids-Big Rapids Grand Rapids-Belding Grand Rapids-Fremont Grand Rapids-Grand Haven Grand Rapids-Hastings Grand Rapids-Ionia Grand Rapids-Lakeview Greenville-Howard City Greenville-Ionia Holland-Grand Haven Jackson-Adrian Jackson-Charlotte Jackson-Coldwater Jackson-Howell Kalamazoo-Allegan Kalamazoo-Battle Creek Kalamazoo-Hartford Kalamazoo-Hastings Kalamazoo-Lawton Kalamazoo-South Haven Kalamazoo-Three Rivers Lansing-Eaton Rapids Lansing-Flint Lansing-Williamstown-Howell Lansing-Ionia Lansing-Jackson Ludington-Manistee Manistee-Traverse City Monroe-Tecumseh Monroe-Toledo OH Muskegon-Grand Haven Muskegon-Newaygo Muskegon-Pentwater Muskegon-Ludington Petoskey-Cheboygan Pontiac-Holly-Fenton Pontiac-Highland Park Saginaw-Alma Saginaw-Cass City Saginaw-Flint Saginaw-Owosso Saginaw-Midland Saline-Ypsilanti South Haven-Saugatuck St. Joseph-Michigan City IN Tekonsha-Union City Three Rivers-Centreville Three Rivers-Sturgis Iron Mountain-Iron River Iron Mountain-Loretto L'Anse-Hancock Marquette-Ishpeming St. Ignace-Sault Ste. Marie