![]() |
Mackinac County MI |

Mackinac, MI postmark dated August 5, 1855.
The MACKINAC ISLAND Post Office was originally established as MICHILIMACKINAC on April 14, 1819 with Adam D. Stewart as its first postmaster. Name changed to MACKINAC around 1822; the name changed to MACKINAW around 1863. Name changed back to MACKINAC on April 27, 1876; name changed to MACKINAC ISLAND on May 12, 1884.
The Mackinac Island, MI Post Office uses zip code 49757. (Contributed by Paul Petosky)
**There was also another vessel named Sainte Marie built in 1913 by the Toldeo Shipbuilding Company at Toldeo, OH. This was built for the Mackinac Transportation Company in St. Ignace, MI who owned this vessel from 1913-1961. When winter service began in 1931 the Highway Department arranged with the Mackinac Transportation Company to carry cars across the Straits on a railroad icebreaker during the cold winter months. In 1936 the Highway Department decided to lease the railroad icebreaker Sainte Marie for winter operations on a regular basis. In 1961 it was sold to the Sadoff Company, Fond du Lac, WI and in 1962 is was scrapped in Ashtabula, OH.