The Dunham Baseball Organization is a community-based, not-for-profit, 501(c)(3) organization that promotes baseball instruction, competition, and sportsmanship for more than 500 children ages 4 to 18 years old. The DBBO tradition dates back to 1968 and is based at the Chicago Park District's Dunham Park on the Northwest Side. The organization relies 100% on its parent volunteers to coach and to operate the league. The baseball season runs from April to July.