RCW 52.04.151Annexation of territory not in same county—District name.Any fire protection district located in a single county that annexes territory in another county shall be identified by the name of each county in which the fire protection district is located, listed alphabetically, followed by a number that is the next highest number available for a fire protection district in the one of these counties that has the greatest number of fire protection districts.[ 1989 c 63 s 12.]
Washington Legal Code