Northwestern Garter Snake
- kingdom: Animalia
- phylum: Chordata
- class: Reptilia
- order: Squamata
- family: Natricidae
- genus: Thamnophis
- species: Thamnophis ordinoides
Burnaby- Campbell River
- Lake Cowichan
- Nanaimo
- New Westminster
- North Saanich
- Parksville
- Port Alberni
- Vancouver
British Columbia
Canada
Albany- Berkeley
- Crescent City
- McKinleyville
- Plymouth
- San Diego
California- Boulder
Colorado- Albany
- Astoria
- Barview
- Beaverton
- Brookings
- Bunker Hill
- Cedar Hills
- Coos Bay
- Coquille
- Corvallis
- Dayton
- Drain
- Dunes City
- Eugene
- Gearhart
- Gold Beach
- Grand Ronde
- Harbor
- Lyons
- Millersburg
- Milwaukie
- Myrtle Point
- Newport
- Oak Grove
- Oakridge
- Oregon City
- Philomath
- Port Orford
- Portland
- Rainier
- Raleigh Hills
- Rockaway Beach
- Saint Helens
- Sandy
- Seaside
- Sheridan
- Siletz
- Springfield
- Stayton
- Sublimity
- Tangent
- Tillamook
- Toledo
- Troutdale
- Veneta
- Waldport
- Warrenton
- West Linn
- West Slope
Oregon- Aberdeen
- Amboy
- Anacortes
- Bainbridge Island
- Bellingham
- Bethel
- Blaine
- Bremerton
- Carson
- Cathlamet
- Chehalis
- Clearview
- Darrington
- DuPont
- Eatonville
- Everett
- Fircrest
- Forks
- Fort Lewis
- Fox Island
- Friday Harbor
- Geneva
- Gleed
- Kalama
- Kent
- Lacey
- Longview
- Maltby
- Marysville
- Monroe
- Montesano
- Mount Vernon
- Mukilteo
- North Puyallup
- Ocean Park
- Ocean Shores
- Parkland
- Parkwood
- Port Angeles
- Port Orchard
- Port Townsend
- Pullman
- Puyallup
- Rosedale
- Seabeck
- Seattle
- Sequim
- Shoreline
- Snohomish
- Spokane
- Steilacoom
- Stevenson
- Sumas
- Tacoma
- Tanglewilde-Thompson Place
- University Place
- Vashon
- West Lake Sammamish
Washington
United States