This is not an exhaustive list, but has most of the closer, reputable programs.
Please note that many of these programs are very selective and there are tryouts (and many kids won't make the team). Also, usually these programs are much more expensive than Little League (although they also have many more hours of training and play), and there are usually no scholarships.
Unlike Little League, age for these programs is determined by how old your child will be on May 1 2023 for the next season. So if he's 12 now but turns 13 before May 1, then he will be a 13U.
Tryouts are usually in May or June, but many programs have them on a rolling basis.
Note that SBLL is not officially affiliated with any of these programs.
1. Del Mar Powerhouse: www.dmpowerhousebaseball.com.
2. The Saints are based in Rancho Santa Fe. Website is https://www.sandiegosaintsbaseball.com/.
3. North County Mavericks. Website: http://www.mavsbaseball.org/.
4. BPA: https://www.bpasportsgroup.com/bpa-teams
5. San Diego Hawks: https://www.sandiegohawks.com/
6. Longhorns: Website: https://www.sandiegolonghorns.com/
7. San Diego Stars: http://sdstars.com/
8. San Diego Show: https://www.sandiegoshowbaseball.com/
9. Canes: https://www.canesbaseballsandiego.com/