Brush Prairie is a census-designated place (CDP) in Clark County, Washington, United States.

[4] The community was named by Elmarine Jane Bowman for a brushy prairie and swamp on her father's homestead.

The community is bordered by Meadow Glade and Battle Ground to the north, Hockinson to the east, Orchards and Five Corners to the south, and Barberton to the west.

According to the United States Census Bureau, the Brush Prairie CDP has a total area of 7.8 square miles (20.3 km2), all of it land.

21.0% were of German, 8.9% United States or American, 8.7% Irish, 8.4% Norwegian, 6.8% English and 6.7% French ancestry according to Census 2000.