| Business | Phone |
| Ayso San Mateo Region 36 San Mateo 94403 | (650) 341-4112 |
| B'Nai Brith Youth Organization 1710 S Amphlett Blvd, San Mateo 94402 | (650) 627-8560 |
| Boys & Girls Club Mid Pa 200 N Quebec St, San Mateo 94401 | (650) 347-9891 |
| Junior State Of America 400 S El Camino Real # 300, San Mateo 94402 | (650) 347-4777 |
| Junior Statesmen Foundation 400 S El Camino Real, San Mateo 94402 | (650) 347-6415 |
| San Mateo Little League Triete Park, San Mateo 94402 | (650) 341-4448 |
| Youth Center 1300 S Amphlett Blvd, San Mateo 94402 | (650) 577-1300 |