| Business | Phone |
| Communications Workers-America Redwood City 94063 | (650) 369-9423 |
| Crona 499 Seaport Ct # 202, Redwood City 94063 | (650) 366-0156 |
| Iamw 617 Veterans Blvd, Redwood City 94063 | (650) 568-6186 |
| National Assn-Letter Carriers 626 Jefferson Ave, Redwood City 94063 | (650) 367-8778 |
| Painters' Union Local 913 1755 E Bayshore Rd # 14a, Redwood City 94063 | (650) 364-7317 |
| Redwood City Teachers Assn 555 Avenue Del Ora, Redwood City 94062 | (650) 299-1162 |
| Service Employees Intl Union 891 Marshall St, Redwood City 94063 | (650) 365-8715 |