I have looking for a list of standard fire apparatus numbering in most counties. Usually the Cities are straight forward. Engine 2 or Truck 4. Most the ambulances in Eastern Iowa usually goes by county number followed by the letter A with a unit number. Some counties like Clinton Co. uses a 5x series in the county listing. For example Genesis DeWitt has units 1851/52/53. While Cedar County uses 16Axx. Of course Scott County Medic used Medic xx.