District courts -- Civil procedure: Title 12 RCW.
Justice or constable levying demand or promising reward: RCW 9.12.020.
Municipal courts, cities over four hundred thousand: Chapter 35.20 RCW.
Persons convicted in district court may be placed under supervision of county probation officer: RCW 9.92.060, 9.95.210.
Public bodies may retain collection agencies to collect public debts -- Fees: RCW 19.16.500.
Small claims department: Chapter 12.40 RCW.