• Islands of King County, Washington (5 P)
• Islands of Pierce County, Washington (12 P)
• Islands of Skagit County, Washington (11 P)

A

• Artificial islands of Washington (state) (3 P)

I

• Islands of Seattle (2 P)

L

• Lake islands of Washington (state) (5 P)

P

• Pacific islands of Washington (state) (2 C, 9 P)
• Private islands of Washington (state) (8 P)

R

• River islands of Washington (state) (1 C, 4 P)

S

• San Juan Islands (60 P)

U

• Uninhabited islands of Washington (state) (51 P)

*

• List of islands of Washington

A

• Anderson Island (Washington)

B

• Blake Island

C

• Camano Island
• Craft Island
• Cypress Island

E

• Eagle Island (Washington)
• Edmount Island
• Eliza Island

F

• Fidalgo Island
• Florence Island (Washington)
• Fox Island, Washington

G

• Guemes Island

H

• Harstine Island, Washington
• Herron Island
• Holmes Island (Washington)

I

• Ika Island
• Indian Island, Washington

J

• Jetty Island

K

• Kiket Island

L

• Long Island (Washington)
• Lummi Island

M

• Maury Island
• McNeil Island

P

• Patos Island
• Protection Island (Washington)

R

• Raft Island
• Reach Island

S

• Samish Island, Washington
• Sinclair Island (Washington)
• Smith Island (Washington)
• Squaxin Island
• Strawberry Island (Deception Pass, Washington)
• Strawberry Island (Rosario Strait, Washington)
• Stretch Island

T

• Tanglewood Island

V

• Vashon, Washington
• Vendovi Island
• Victim Island

W

• Waadah Island
• Whidbey Island