Bagley Park is a two-acre municipal park in downtown Hillsboro, Oregon, United States. Opened in 1926, the park covers a half-block at northeast Second Avenue and Jackson Street north of the Washington County Courthouse. After a major renovation project ending in 2008, the park includes a picnic shelter, a playground, restrooms, and several sport…Bagley Park is a two-acre municipal park in downtown Hillsboro, Oregon, United States. Opened in 1926, the park covers a half-block at northeast Second Avenue and Jackson Street north of the Washington County Courthouse. After a major renovation project ending in 2008, the park includes a picnic shelter, a playground, restrooms, and several sports facilities.