The 15th State Senate District is located in Oakland county and includes: Commerce Twp, Highland Twp, Holly Twp, Lyon Twp, Milford Twp, Northville city (part), Novi city, Novi Twp, Orchard Lake city, Rose Twp, South Lyon city, Walled Lake city, West Bloomfield Twp, White Lake Twp and Wixom city.