For emergencies in Ann Arbor and all of Washtenaw County, dial 911. This emergency number connects callers with the nearest police communications center or Washtenaw Central Dispatch. These centers are linked directly to Huron Valley Ambulance and to local fire departments. After dialing 911, give the dispatcher your name and the phone number and address at which emergency aid is needed. Do not hang up until after the dispatcher does. Coins are not needed for 911 calls from pay phones.