4204 Main Street Brewing Company opened its doors in May 2014. 4204 is located in Belleville, IL--- a small city on the outskirts of St. Louis, MO. Belleville is the home to many German descendants, and has a proud tradition of brewing. The city had been without a brewery since the 1980s, when Stag closed its doors. 4204 brought the brewing back to Belleville.