1st Regiment, United States Lancers, Michigan Cavalry

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Brief History
The 1st Regiment, United States Lancers, Michigan was organized at: Detroit, Saginaw and St. John, Michigan from November 30, 1861 to February 20, 1862. It was mustered out: March 20, 1862.

1st Regiment, United States Lancers, Michigan Cavalry article on Wikipedia gives a brief history of the unit

Companies in this Regiment with the Counties of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.