In 1946, the Ports finished first in the California League with a 78-52 record and their first of 11 California League titles.
In 1947, the Ports captured their second championship, as one of two teams in the League that were not affiliated or owned by a major league team. The Ports did have a limited agreement with the Oakland club in the Pacific Coast League. En route to the title, the Ports went on a 26-game winning streak, which remains a Cal League record and is the second longest winning streak in baseball history. The Ports, led by manager Johnny Babich, finished the season with a 95-45 record, 16 full games ahead of San Jose and Visalia.
Baseball historians Bill Weiss and Marshall Wright ranked the 1947 Ports among the top 100 greatest Minor League Baseball teams, placing them at No. 98.
In 1947, the League expanded to include teams in San Jose and Ventura. Today, there are eight teams in the California League (now called Low-A West) split up into two divisions, with four each in the north and south. The Northern Division is made up of the Fresno Grizzlies, Modesto Nuts, San Jose Giants, and Stockton Ports. The Southern Division is composed of the Inland Empire 66ers, Lake Elsinore Storm, Rancho Cucamonga Quakes, and Visalia Rawhide.
In addition to having the most titles by any active team in the league (11), the Ports are tied with the Fresno Cardinals/Giants for the most franchise titles in League history. Stockton was also the fastest team in League history to reach the 5,000 win plateau, a feat they accomplished in 2018.
Since joining the California League in 1941, the Ports remained with the League until 1972, and returned in 1978. During the 1980s and into the '90s, the Ports were one of the nation's winningest Minor League Baseball teams, totaling 977 wins through the 1991 season. The Ports also had the best win-loss percentage in all of Minor League Baseball for the 1980s.
After the 1999 season, the team renamed themselves the Mudville Nine as a salute to Thayer's poem and their own roots. Following the 2001 season, the Nine reverted back to the name Ports and continued to find plenty of success in the California League.