Youth leagues
Listed north to south.
Daly City
- Daly City Baseball League — city rec, K–2nd grade.
South San Francisco
- South City Youth Baseball — independent, ages ~5–14.
San Bruno
- San Bruno Youth Baseball — PONY-affiliated, ages 3/4 (Wiffle) up through 16 (Colt).
Millbrae
- Millbrae Lions Baseball — independent (Millbrae Lions Club), ages 5–14.
Burlingame
- Burlingame Youth Baseball Association (BYBA) — independent, ages 5–19.
Hillsborough
- Hillsborough Little League (LL D52) — ages 4–14.
Half Moon Bay (coastside)
- Half Moon Bay Little League (LL D52) — rec divisions.
- Half Moon Bay Pirates — competitive / travel, ages 7 through high school.
San Mateo
- San Mateo Little League American (SMLLA) (LL D52) — ages 4–14.
- San Mateo National Little League (SMNLL) (LL D52) — ages 4–14.
- Alpine Little League (LL D52) — ages ~4–14.
- San Mateo PONY Baseball — ages 12–16.
Foster City
- Foster City Little League (FCLL) (LL D52) — ages 4–14.
- Foster City Tournament Baseball — summer/tournament program.
Belmont
- Belmont–Redwood Shores Little League (BRSLL) (LL D52) — ages 4–14.
San Carlos
- San Carlos Little League (LL D52) — ages 4–14 (Juniors to 16).
Redwood City
- Redwood City Little League (RWCLL) (LL D52) — ages 4–14.
Atherton & Menlo Park
- Menlo–Atherton Little League (LL D52) — ages ~4–14.
East Palo Alto
- Ravenswood Little League (LL D52) — ages 4–13.
- EPA T-Ball & Pitching Machine League — community rec.
- Junior Giants EPA — community rec, ages ~4–13.
Palo Alto
- Palo Alto Little League (LL D52) — ages 4–16 (including Challenger).
Los Altos & Los Altos Hills
- Los Altos American Little League (LALL) — ages 5–16.
- Los Altos–Mountain View PONY Baseball — Shetland through Pony (ages 4–14).
Mountain View
Adult rec leagues
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Bay Area MSBL (BAMSBL)
MSBL/MABL-affiliated. ~26 teams across SF, East Bay, Peninsula, Marin. Divisions 18+, 30+ (sometimes 35+), 45+, and 60+. Tryouts mid-Feb to early March; 16-game regular season starts in April.
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San José MSBL
Divisions 18+, 25+, 35+, 45+.
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MSBL / MABL National
National umbrella with a "Find a League" lookup.
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Adult Baseball Central
Cross-reference directory of adult baseball leagues.
Governing bodies
The major organizations that sanction baseball on the Peninsula and how they're structured locally.
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Little League Baseball
National youth baseball (ages ~4–16). Peninsula leagues sit under California District 52, covering Pacifica south through Palo Alto. D52 runs All-Star tournaments each summer in 5 age groups feeding into Section 3 → NorCal.
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PONY Baseball
Ages 3–18, organized as Shetland / Pinto / Mustang / Bronco / Pony / Colt / Palomino. NorCal is part of the PONY West Zone. Peninsula 15–16U players share the Peninsula Colt League.
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Babe Ruth / Cal Ripken
Ages 4–18 (Cal Ripken 4–12, Babe Ruth 13–18). NorCal is administered by NorCal Cal Ripken Baseball; tournaments feed the Pacific Southwest Region.
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USSSA Baseball
Primarily a tournament and travel-ball sanctioning body. Most Peninsula travel clubs play into USSSA NorCal events.