[3][4] Mason County comprises the Shelton micropolitan statistical area and is included in the Seattle-Tacoma combined statistical area.

[5] Oakland Bay As of the 2010 census, there were 60,699 people, 23,832 households, and 16,057 families living in the county.

[12] The racial makeup of the county was 86.1% white, 3.7% American Indian, 1.2% Asian, 1.1% black or African American, 0.4% Pacific islander, 3.4% from other races, and 4.1% from two or more races.

[11] In terms of ancestry, 19.7% were German, 13.8% were English, 13.5% were Irish, 6.7% were Norwegian, and 4.9% were American.

[14] As of the 2000 census, there were 49,405 people, 18,912 households, and 13,389 families living in the county.

The racial makeup of the county was 88.46% White, 1.19% Black or African American, 3.72% Native American, 1.05% Asian, 0.45% Pacific Islander, 2.10% from other races, and 3.03% from two or more races.

16.7% were of German, 9.9% Irish, 9.8% English, 8.6% United States or American and 6.8% Norwegian ancestry.

23.30% of all households were made up of individuals, and 9.90% had someone living alone who was 65 years of age or older.