State FIPS Code: 53
County FIPS Code: 45
County FIPS Class: H1
County Description:
| County Office Name | County Office Description | County Office Phone |
|---|---|---|
| Mason County Assessor | Mason County Assessor | (360) 427 - 967 |
| Mason County Auditor / Recorder | Mason County Auditor / Recorder | (360) 427 - 967 |
| Mason County Treasurer | Mason County Treasurer | (360) 427 - 967 |
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