NL West Division
The NL West division has had the following constructs:
1993: Atlanta Braves, Cincinnati Reds, Colorado Rockies, Houston Astros, Los Angeles Dodgers, San Diego Padres, and San Francisco Giants
1994-1997: Colorado Rockies, Los Angeles Dodgers, San Diego Padres, and San Francisco Giants
1998-present: Arizona Diamondbacks, Colorado Rockies, Los Angeles Dodgers, San Diego Padres, and San Francisco Giants
- The Houston Astros won a one-game playoff against the Los Angeles Dodgers for the Division title.
- Split-season format adopted because of the 1981 strike. The Los Angeles Dodgers won the first-half title and the Houston Astros won the second half title. The Dodgers defeated the Astros in the Division Series to represent the NL West in the 1981 NLCS.
- The 1994 postseason was cancelled because of the 1994 strike; first season played under three-division format.
- The San Diego Padres and Los Angeles Dodgers finished with identical records; San Diego won the Division title because of a better head-to-head record
- The Los Angeles Dodgers won a one-game playoff against the Colorado Rockies for the Division title.
- Season shortened by the Coronavirus pandemic; a special Postseason format was used.
The National League West Division has provided one of the National League Wild Card teams 12 times since 1995, for a total of 13 teams:
- 1995 Colorado Rockies
- 1996 Los Angeles Dodgers
- 2002 San Francisco Giants Lost World Series to Anaheim Angels
- 2006 Los Angeles Dodgers
- 2007 Colorado Rockies Lost World Series to Boston Red Sox
- 2009 Colorado Rockies
- 2014 San Francisco Giants Won World Series over Kansas City Royals
- 2016 San Francisco Giants
- 2017 Arizona Diamondbacks and Colorado Rockies
- 2018 Colorado Rockies
- 2020 San Diego Padres (2nd place)
- 2021 Los Angeles Dodgers