The Rainbow Ballroom, at 38 E 5th Avenue (at Lincoln N Lincoln Street), Denver, was a dance hall that was one of the best known dance halls west of the Mississippi, according to a 1946 Billboard article. Its capacity of 3,000 made it the largest indoor dance hall in Colorado during its 28 years of existence — from its opening day on September 16, 1933, to its closing day in 1961.