Augusta is a city in St. Charles County, Missouri, United States. The population was 253 at the 2010 census. The city boasts wineries, antique shops, restaurants, B&B's, a wood shop, a glass studio, massage therapy, a historic museum and The Augusta Brewery.Augusta is located in the Missouri Rhineland. As a result, it is home to two wineries, Augusta Winery and Mount Pleasant Winery. The Augusta AVA was recognized by the federal government in 1980 as the first designated American Viticultural Area in the United States, beating out Napa Valley.Augusta is a popular stop along the Katy Trail, a 225-mile-long bike and walking path built along a former railroad right-of-way.