Brewster is a city in Nobles County, Minnesota, United States. The population was 506 at the 2020 census. According to the United Stat…Brewster is a city in Nobles County, Minnesota, United States. The population was 506 at the 2020 census. According to the United States Census Bureau, the city has a total area of 1.36 square miles, all land. It is located one-half mile from the Jackson County line, on section 25 of Hersey Township. The population was 502 at the 2000 census.