Mich. Comp. Laws § 15.602: Residency requirements of public employees.

Sec. 2.

Except as provided in subsection (2), a public employer shall not require, by collective bargaining agreement or otherwise, that a person reside within a specified geographic area or within a specified distance or travel time from his or her place of employment as a condition of employment or promotion by the public employer.

Subsection (1) does not prohibit a public employer from requiring, by collective bargaining agreement or otherwise, that a person reside within a specified distance from the nearest boundary of the public employer. However, the specified distance shall be 20 miles or another specified distance greater than 20 miles.

A requirement described in subsection (2) does not apply to a person if the person is married and both of the following conditions are met:

The person's spouse is employed by another public employer.

The person's spouse is subject to a condition of employment or promotion that, if not for this section, would require him or her to reside a distance of less than 20 miles from the nearest boundary of the public employer.

Subsection (1) does not apply if the person is a volunteer or paid on-call firefighter, an elected official, or an unpaid appointed official.