It's easy to find out who your representatives are at the state and federal levels:
Michigan State Representative: House.Michigan.gov
Michigan State Senator: Senate.Michigan.gov
U.S. Congressperson: House.gov
U.S. Senators: Senate.gov
Michigan’s executive branch (Governor, Lieutenant Governor, Secretary of State, and Attorney General): Michigan.gov/SOM/Government
Michigan's judicial branch: Michigan.gov/SOM/Government