The county board of supervisors advertised for bids in early 1856 to build a brick courthouse, and awarded the contract to A. Witherall on April 1 for $15,479.

The courthouse was built "in the center of the public square ... at equal distances from the outsides, the ends or fronts of said building to face Fourth and Oregon streets".

[5]: 80 The original building from 1857 remained in service until 2021,[6] albeit with expansions and wings added in 1885 and 1896–97; a large concrete addition was built from 1953 to 1954 on the east side facing Fourth.

The first date of occupancy for the new building, with 67,459 sq ft (6,267.1 m2) of space on 2.4 acres (0.97 ha) of land, was June 14.

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