| | Team - Most Losses in a Season |
| | year | | tm_nm | tm_abr | manager | loss |
| | 2004 | | Other Ones | OO | Jake Smith | 131 |
| | 1999 | | Pleasanton Cubies | PC | Jason Schreiber | 128 |
| | 2000 | | Deep Elem Blues | DE | Jake Smith | 124 |
| | 1991 | | Pleasanton Cubies | PC | Jason Schreiber | 120 |
| | 1986 | | Modesto A's | MA | Myron DeVoto | 119 |
| | 2006 | | Honker Bay Crawdads | HB | Jack Champman | 117 |
| | 1984 | | Prosperity Patriots | PP | Kevin Grose | 116 |
| | 2007 | | California Quakes | CQ | Steve Wolfenberger | 116 |
| | 2005 | | St. Paul Polar Bears | SP | Rick Ohman | 115 |
| | 1990 | | Sillicon Valley Chipmonks | SV | Clyde Jones | 114 |
| | 2001 | | Bodega Bay Ballbreakers | BO | Manny Delao | 114 |
| | 2002 | | Desert Twisters | DT | Dave Brickell | 113 |
| | 1985 | | Montgomery County Cubs | MC | Jeff Conkle | 112 |
| | 2002 | | Johnson County Hilltoppers | JC | David Hill | 111 |
| | 1992 | | California Quakes | CQ | Steve Wolfenberger | 111 |
| | 2001 | | Deep Elem Blues | DE | Jake Smith | 110 |
| | 2006 | | California Quakes | CQ | Steve Wolfenberger | 109 |
| | 2003 | | East Bay Avalanche | EB | Ryan Ashburn | 108 |
| | 1989 | | Panama City Sunshiners | PC | Bill Miller | 108 |
| | 2005 | | Thunder Valley Tigers | TV | Myron DeVoto | 108 |
| | 1991 | | Bonac Dodgers | BD | Bill Miller | 108 |
| | 2004 | | East Bay Avalanche | EB | Ryan Ashburn | 108 |
| | 1998 | | California Livewires | CL | Carl Hoffman | 107 |
| | 1992 | | San Jose Stars | SJ | Carl Johnson | 106 |
| | 2007 | | San Jose Stars | SJ | Carl Johnson | 106 |
| | 2005 | | Other Ones | OO | Jake Smith | 106 |
| | 1986 | | New Hanover Nighthawks | NH | Jake Smith | 106 |
| | 1990 | | Oshkosh Indians | OI | Scott Williams | 105 |
| | Saturday, November 15, 2008 | Page 1 of 3 |