Washington
| Site | Code |
|---|
| BURLINGTON/MT VERN | K75S |
| OAK HARBOR AIRPARK | K76S |
| WALLA WALLA RGNL | KALW |
| ARLINGTON MUNI | KAWO |
| SEATTLE/BOEING FLD | KBFI |
| BELLINGHAM INTL | KBLI |
| PORT ANGELES INTL | KCLM |
| COLVILLE MUNICIPAL | KCQV |
| WENATCHEE/PANGBORN | KEAT |
| EPHRATA MUNICIPAL | KEPH |
| FRIDAY HARBOR | KFHR |
| SPOKANE INTL ARPT | KGEG |
| FORT LEWIS/GRAY AAF | KGRF |
| HANFORD | KHMS |
| HOQUIAM/BOWERMAN | KHQM |
| KELSO-LONGVEIW AWOS | KKLS |
| MOSES LAKE/GRANT CO | KMWH |
| WHIDBEY ISLAND NAS& | KNUW |
| OLYMPIA | KOLM |
| EVERETT/PAINE FIELD | KPAE |
| PASCO/TRI-CITIES | KPSC |
| PULLMAN/MOSCOW RGNL | KPUW |
| BREMERTON NTNL AWOS | KPWT |
| RENTON MUNICIPAL | KRNT |
| SEATTLE-TACOMA INTL | KSEA |
| SPOKANE/FELTS FIELD | KSFF |
| FAIRCHILD AFB | KSKA |
| STAMPEDE PASS(AMOS) | KSMP |
| MC CHORD AFB/TACOMA | KTCM |
| TOLEDO-WINLOCK MEM | KTDO |
| TACOMA NARROWS | KTIW |
| QUILLAYUTE STATE | KUIL |
| YAKIMA AIR TERMINAL | KYKM |