California Little League District 51 is located in the Northeast area of Los Angeles County, most of Kern County, Mono County and Inyo county. District 51 is one of the largest Little League Districts (land wise) in the United States. District 51 starts with the city of Acton in the South and extends to Mammoth Lakes and Bridgeport in the North. There are approximately 6,000 boys and girls playing baseball and softball in 18 different and distinct Little Leagues.
The girls Big League softball team won the World Series in 1996 and 2005, were runners-up in 2000, and participated in the World Series in Kalamazoo, Michigan in 1998, 2001, 2002, 2004, 2006, 2007, 2008, 2009 and 2010 and in Lower Sussex, Delaware in 2013 and 2014 (fourteen of the last twenty years and seven consecutive years).

In 2013 they became the FIRST team to represent the Western Region in Lower Sussex, Delaware (the new location for the Big League Softball World Series).

In addition the Parkview Senior Softball team won the World Championship in 1997 by defeating the eight time champions from Florida. The Parkview 1995 Major Softball team finished 2nd to Waco, Texas in the World Series held at the Alpen Rose Facility in Oregon, and the 2003 Parkview Junior Softball team participated in the Junior Softball World Series in Kirkland, Washington.
District 51 has either won or participated in EVERY Girls Softball World Series held by Little League Baseball and Softball, Inc.