According to the ATF database, there are 7 registered FFLs in Deer Park, Washington.
28825 N SHORT RDDEER PARK, WA, 99006
412 S MAIN STDEER PARK, WA, 99006
811 S MAIN STREETDEER PARK, WA, 990060000
3010 E WESTMORELAND RDDEER PARK, WA, 99006
214 S MAINDEER PARK, WA, 99006
5689 W RIVERVIEW LANEDEER PARK, WA, 99006
5034 BITTRICH-ANTLER RDDEER PARK, WA, 99006