- Bay County doesn't appear on this map as it wasn't organized as a county until 1857.
- It is interesting to compare the 1839 map to a current one to see the dramic differences in county territories. This link will open {Current Michigan County Map} in a new window, reside it and the present window so both are showing.
- Bay county was formed in 1857 form portions of Midland and Saginaw counties, including the area of Arenac county. Later, the Arenac area formed into a county.
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