Northwestern League (1905–1917)

21 teams played in the league throughout its existence. Those teams include the: Aberdeen Black Cats (1905, 1917), Bellingham Gillnetters (1905), Everett Smokestackers (1905), Spokane Indians (1905–1917), Vancouver Horse Doctors (1905, 1907), Victoria Legislators (1905), Butte Miners (1906–1908, 1916–1917), Grays Harbor Lumbermen (1906), Tacoma Tigers (1906–1917), Seattle Siwashes (1907–1908), Grays Harbor Grays (1908–1909), Vancouver Beavers (1908–1911, 1914, 1916–1917), Portland Colts (1909, 1912–1914), Seattle Turks (1909), Seattle Giants (1910–1917), Portland Pippins (1911), Victoria Bees (1911–1915), Vancouver Champions (1912, 1915), Vancouver Bees (1913), Ballard Pippins (1914), a Great Falls, Montana team (1916) and Great Falls Electrics (1917).^[1]

For most of the league's history, there were no official playoffs following the regular season. The only season with a playoff was 1915. Therefore, the team that finished in first place was often the de facto league champion.

The Everett Smokestackers were the league's first champions, finishing in first place in the four team league in 1905. In 1906, the Tacoma Tigers finished in first place, and in 1907, the Aberdeen Black Cats took the crown. The Vancouver Beavers finished in first place in 1908 and again in 1911 and 1914. The Seattle Turks won in 1909 and the Spokane Indians in 1910. In 1912, the Seattle Giants were first, while in 1913 the Vancouver Bees finished on top.^[1]

In 1915, the league played its only official playoff, which matched the first-place Seattle Giants against the second-place Tacoma Tigers. The Giants won the playoff three games to two, though it was presumably supposed to be at least a seven-game series - however, the playoff was abandoned during game six when a dispute broke out.

The Spokane Indians finished in first place in 1916 and the Great Falls Electrics finished in first place in 1917.

• Aberdeen, WA: Aberdeen Black Cats 1907, 1915; Aberdeen Grays 1908–1909
• Aberdeen, WA & Hoquiam, WA: Grays Harbor Grays 1906
• Ballard, WA: Ballard Pippins 1914
• Bellingham, WA: Bellingham Yankees 1905
• Butte, MT: Butte Miners 1906–1908, 1916–1917
• Everett, WA: Everett Smokestackers 1905
• Great Falls, MT: Great Falls Electrics 1916–1917
• Portland, OR: Portland Colts 1909, 1912–1914; Portland Pippins 1911
• Seattle, WA: Seattle Siwashes 1907–1908; Seattle Turks 1909; Seattle Giants 1910–1917
• Spokane, WA: Spokane Indians 1905–1917
• Tacoma, WA: Tacoma Tigers 1906–1917
• Vancouver, BC: Vancouver Horse Doctors 1905, 1907; Vancouver Beavers 1908–1911, 1914, 1916–1917; Vancouver Champions 1912, 1915; Vancouver Bees 1913;
• Victoria, BC: Victoria Legislators 1905; Victoria Bees 1911–1915

• Dave Bancroft, 1913 Portland Colts
• Stan Coveleski, 1913–1914 Spokane Indians
• Harry Heilmann, 1913 Portland Colts
• George Kelly, 1914–1915 Victoria Bees
• Joe McGinnity, 1913–1915 Tacoma Tigers, 1916–1917 Butte Miners, 1917 Great Falls Electrics^[3]