Fairfield:

Health & Social Services
275 Beck Ave
Fairfield, CA 94533

Phone: 784-8051
Hours:  Monday - Friday 8:00 a.m. to 5:00 p.m.

Directions: From Hwy 80, exit onto Hwy 12 East, turn right onto Beck Ave.  Building is in the second block on the right.
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Vacaville:

Health & Social Services
354 Parker Ave
Vacaville, CA 95688

Phone: (707) 469-4500
Hours:  Monday - Friday 8:00 a.m. to 5:00 p.m.

Directions: Take Alamo/Merchant St. exit. Turn right onto Merchant St. Continue until Parker St. Turn left onto Parker St.
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Vallejo:

Main Office - Health & Social Services
365 Tuolumne St.
Vallejo, CA 94590

Phone: (707) 553-5000
Hours:  Monday - Friday 8:00 a.m. to 5:00 p.m.

Directions: Take Solano/Spring exit. Stay on Solano heading west. Turn right onto Tuolumne St., 365 is three story building, behind 355 building, on left across from Court House. During construction, parking is accessed off of Virginia St. or Contra Costa St. and follow signs to walk to the building.
Google Map