There are a few space museums in the Pacific Northwest, all of which are absolutely worth visiting at least once. The space museums of the area are spread throughout the Pacific Northwest, which provides an exploration of the Pacific Northwest to visit all of the museums!
Some of the astronomical observatories have exhibits, such as Hanford LIGO and Goldendale. For those observatories, check out our article here: https://cosmospnw.com/pacific-northwest-astronomical-observatories/

These museums are always having a changing array of museum artifacts and events to offer the public!

Note: Due to COVID-19, and lockdown restrictions, the hours might change. Please stay safe and socially distance. Stay home if you’re feeling sick.

Oregon

McMinville, OR
Evergreen Aviation And Space Museum
Location: 500 NE Captain Michael King Smith Way, McMinnville, OR 97128
Hours: Daily 9AM – 5PM 
Cost: $19-$27

Eugene, OR
Oregon Air and Space Museum
Location: 90377 Boeing Drive, Eugene, OR, United States
Hours: Wed-Sat from 12:00 pm to 4:00 pm
Admission:
Adults $7
Seniors (62 & over) $6
Ages (6-17) $3
Ages 5 and under Free

Portland, Oregon
OMSI (Oregon Museum of Science and Industry)
Location: 1945 SE Water Ave, Portland, OR 97214 
Hours: Mondays–Closed. Tuesdays 9:30AM–5:30PM. Saturday + Sunday 9:30AM–7PM
Cost: $9-$20 

Washington

Seattle
Museum of Flight
Location: 9404 E Marginal Way S, Seattle, WA 98108 
Hours: Daily 10AM – 5PM
Cost: $16-$25