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).

For most of the league's history, there were no official playoffs following the regular season - in fact, 1915 was the only season in which a playoff was played. 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 in 1909 and the Spokane Indians in 1910. In 1912, the Seattle Giants were first, while in 1913 the Vancouver Bees finished on top.

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

1905 Northwestern League - schedule pt 1 - pt 2
President: William Henry Lucas

# Victoria (14-38) moved to Spokane July 11.
The season was shortened to September 11.
Playoffs: None; the first half finished in a tie and it was decided that if Everett won the second half, the pennant would be awarded to Everett.

1906 Northwestern League - schedule
President: William Henry Lucas

# Represented Aberdeen-Hoquiam, Washington.

1907 Northwestern League - schedule
President: William Henry Lucas

1908 Northwestern League - schedule
President: William Henry Lucas

1909 Northwestern League - schedule
President: William Henry Lucas

1910 Northwestern League - schedule
President: William Henry Lucas

1911 Northwestern League - schedule
President: Robert Lindsay / Dan Dugdale

1912 Northwestern League - schedule
President: Fielder Jones

1913 Northwestern League - schedule
President: Fielder Jones

1914 Northwestern League schedule
President: Fielder Jones / E.H. Hughes

#Portland (36-60) moved to Ballard July 20.

1915 Northwestern League - schedule
President: Bob Blewett

# Victoria and Aberdeen withdrew with league permission, August 1.
Playoff: Seattle 3 games, Tacoma 2; abandoned when the sixth game broke up in a dispute.

1916 Northwestern League - schedule
President: Bob Blewett

1917 Northwestern League - schedule
President: Bob Blewett

The season was shortened to July 15 with National Association approval.

• Baseball Reference