The 18th and 22nd Michigan Senate districts, as created in the 2011 redistricting process.Michigan's 18th Senate District covers the Cities of Ann Arbor and Ypsilanti and surrounding townships. As of the State's 2010 Senate elections, the district included northern and portions of western Washtenaw, extending to Chelsea.  In the 2011 redistricting, the district's boundaries changed to include Saline and Milan and exclude Chelsea, Dexter, and Northfield Township; the 2014 election will be the first to use these new boundaries.