Some of the casinos are open from 11:00 a.m. The minimum age for gambling is 21 in Indiana and there are many riverboat casinos where of age gamblers can play. Gambling in Indiana casinos is very popular. The largest single-day sporting event in the world is held in Indianapolis.This event is the Indianapolis 500-Mile Race. The capital of Indiana is Indianapolis, which is the 'amateur sports capital of the world,' The population in Indianapolis is rapidly approaching 2,000,000. Indiana casinos are located in the 'Hoosier state,' a state in the midwest at the 'crossroads of America.' With a population of over 6,000,000 and an area of 35,867 square feet, Indiana is known for manufacturing, agriculture, and mining of decorative limestone.