- County Building #1: 411 North 5th Street
• Assessor
• Auditor
• Central Operations
• Commissioners
• Human Resources
• Planning
• Treasurer
- County Building #2: 410 North 4th Street
•Public Defense Administration
- County Building #3: 426 West Cedar St
• Building Department
• Fire Marshall
- County Building #4: 303 North 4th Street
• WSU Extension
- County Building #5: 521 West Alder Street
• ER & R
• Information Services
- County Building #6: 414 North 5th Street
• Coroner
• Modular Courtroom
- County Building #7: 521 North 4th Street
• Prosecutor
- County Building #8 Upper Level 615 West Alder Street
• Probation Services
- County Building #8 Lower Level: 415 North 6th Street
• Environmental Health
• Family and Community Health
- County Building #9: 423 North 5th Street
• Board of Equalization Hearing Room
- Sheriff's Office: 322 North 3rd Street
- Main Courthouse: 419 North 4th Street
- Juvenile Detention Center: 317 North 5th Street
- Mason County Jail: 411 North 4th Street
- Mason County Parks, Facilities, and Trails, 2100 East Johns Prairie Road
- Mason County Public Works: 100 West Public Works Drive
- Mason County Sheriff Belfair Office: NE 23293 SR 3, Belfair Landing, Building B, Suite B-2, Belfair
- Memorial Hall, 210 W. Franklin
- Old WSU Extension Office, 11840 North US Hwy 101
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