| Most recent season or competition: 2019 Senior League World Series | |
| Sport | Baseball |
|---|---|
| Founded | 1962 |
| No. of teams | 12 |
| Country |  United States |
| Most recent champion(s) |  Wailuku, Hawaii |
| Most titles |  Southern California (21) |
The Senior League World Series West Region is one of six United States regions that currently sends teams to the World Series in Easley, South Carolina. The region's participation in the SLWS dates back to 1962.
As of the 2022 Senior League World Series.
As of the 2019 Senior League World Series.
| State | Region Championships | SLWS Championships |
|---|---|---|
| Southern California | 21 | 3 |
| Hawaii | 18 | |
| Northern California | 15 | 1 |
 Nevada | 3 | 0 |
 Arizona | 2 |
West Region in other Little League divisions
Little League Baseball and Softball is a 501(c)(3) nonprofit organization based in South Williamsport, Pennsylvania, United States, that organizes local youth baseball and softball leagues throughout the United States and the rest of the world.
The Little League Baseball World Series is an annual baseball tournament for children—typically boys—aged 10 to 12 years old, held in the Eastern United States. Originally called the National Little League Tournament, it was later renamed for the World Series in Major League Baseball. The Series was first held in 1947 and is held every August in South Williamsport, Pennsylvania; while the postal address of the organization is in Williamsport, the Series itself is played at Howard J. Lamade Stadium and Volunteer Stadium at the Little League headquarters complex in South Williamsport.
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The Senior League World Series is a baseball tournament for children aged 13 to 16 years old that began in 1961. In 2017, the tournament was moved from Bangor, Maine to Easley, South Carolina. It is patterned after the Little League World Series, which was named for the World Series in Major League Baseball since 2002.
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The Intermediate League World Series West Region is one of five United States regions that currently sends teams to the Intermediate League World Series in Livermore, California. The region's participation in the ILWS dates back to 2013.
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Qualification for the 2021 Little League World Series took place across eight United States regions. The first regional tournament began on August 5 and the final tournament concluded on August 14. As a result of the COVID-19 pandemic, Little League Baseball made the decision to hold the tournament without teams from outside of the United States for the first time since 1975. Instead, the top two teams from each U.S. region qualified for the final tournament. In all, 53 teams were invited to the regional tournaments; two from California, two from Texas, one each from the other 48 states, and one from the District of Columbia.
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