|Formerly||Western International League (WIL) (1937–1954)|
|No. of teams||8|
|Countries||United States, Canada|
|Most titles||8 (tie) – Spokane, Yakima|
|Classification||Class A Short Season|
Northwest League of Professional Baseball (or simply the Northwest League or NWL) is a Class A Short Season minor league. The NWL's short season starts in mid-June, after major league teams have signed their amateur draft picks to professional contracts, and ends in early September. All eight teams are affiliated with a major league team.
The Northwest League (or the Northwestern League) has existed in various forms since 1890, and has been in its current incarnation since 1955. It switched to the short season schedule in 1966, with only four teams.
The WIL had ten teams in its final year in 1954, with four in Canada. The six U.S. cities plus Eugene were the seven charter teams of the Northwest League in 1955: Salem Senators, Eugene Emeralds, Yakima Bears, Spokane Indians, Tri-City Braves, Wenatchee Chiefs, and Lewiston Broncs. During its fiftieth season in 2004, five of the seven original cities were in the league.
|North||Everett AquaSox||Seattle Mariners||Everett, Washington||Everett Memorial Stadium||3,682||100,613||2,648|
|Spokane Indians||Texas Rangers||Spokane, Washington||Avista Stadium||6,803||188,956||5,107|
|Tri-City Dust Devils||San Diego Padres||Pasco, Washington||Gesa Stadium||3,654||86,022||2,264|
|Vancouver Canadians||Toronto Blue Jays||Vancouver, British Columbia||Scotiabank Field at Nat Bailey Stadium||6,013||215,535||5,825|
|South||Boise Hawks||Colorado Rockies||Boise, Idaho||Memorial Stadium||4,500||109,945||2,893|
|Eugene Emeralds||Chicago Cubs||Eugene, Oregon||PK Park||4,000||120,931||3,182|
|Hillsboro Hops||Arizona Diamondbacks||Hillsboro, Oregon||Ron Tonkin Field||4,500||143,412||3,774|
|Salem-Keizer Volcanoes||San Francisco Giants||Keizer, Oregon||Volcanoes Stadium||4,250||85,851||2,259|
Current team rosters
Main article: Northwest League rosters
Former Northwest League Teams (1955–)
Cities that have hosted NWL teams
Eugene is the most-tenured city in the NWL, having fielded a team in all but five of the NWL's seasons (from 1969–73, they had a PCL franchise)
- Missildine, Harry (April 20, 1972). "Northwest League goes back to 1890". Spokesman-Review (Spokane, Washington). p. 22.
- "Northwest League assured for 1966". Eugene Register-Guard (Oregon). November 30, 1965. p. 3B.
- Harvey, Paul, III (June 23, 1966). "4-team NWL slates 12th opener Friday". Eugene Register-Guard (Oregon). p. 2D.
- "Northwest League: final standings". Eugene Register-Guard (Oregon). September 6, 1966. p. 3B.
- "Northwest loop begins to shape into a tight seven-team battle". Spokane Daily Chronicle (Washington). June 11, 1955. p. 8.
- Rodman, Bob (June 17, 1981). "29 years of minor league baseball". Eugene Register-Guard (Oregon). p. 1E.