The population of St. Louis at the beginning of the 20th century was over 500,000, and it was the fourth largest city in the U.S. The city was booming with rapid infrastructure and transportation development projects. The period culminated with the 1904 World’s Fair and 1904 Summer Olympics, held concurrently in St. Louis. More than 20 million people visited the fair during its seven-month run, immortalized in the song “Meet Me in St. Louie, Louie.” Below are some historical photographs showing towns, landmarks, markets, streets, shops, and everyday life of the People of St. Louis in the 1900s. Vote your favorites, and don’t forget to share.