Wasco County, Oregon was formed from Clackamas, Linn and Marion counties in 1854.

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1850 Wasco County, Oregon Census

1860 Wasco County, Oregon Census

1870 Wasco County, Oregon Census

1880 Wasco County, Oregon Census

1890 Wasco County, Oregon Census

1900 Wasco County, Oregon Census

1910 Wasco County, Oregon Census

1920 Wasco County, Oregon Census

1930 Wasco County, Oregon Census