990
- 99001 Airway Heights
- 99003 Chattaroy
- 99004 Cheney
- 99005 Colbert
- 99006 Deer Park
- 99008 Edwall
- 99009 Elk
- 99011 Fairchild Air Force Base
- 99012 Fairfield
- 99013 Ford
- 99016 Spokane Valley
- 99017 Lamont
- 99018 Latah
- 99019 Liberty Lake
- 99020 Marshall
- 99021 Mead
- 99022 Medical Lake
- 99023 Mica
- 99025 Newman Lake
- 99026 Nine Mile Falls
- 99027 Otis Orchards
- 99029 Reardan
- 99030 Rockford
- 99031 Spangle
- 99032 Sprague
- 99033 Tekoa
- 99034 Tumtum
- 99036 Valleyford
- 99037 Spokane Valley
- 99039 Waverly
- 99040 Wellpinit