Avoca is a city located in Murray County, Minnesota. As of the 2000 census, the city had a total population of 146.
According to the United States Census Bureau, the city has a total area of 3.3 km2 (1.3 mi2). 2.8 km2 (1.1 mi2) of it is land and 0.5 km2 (0.2 mi2) of it is water. The total area is 15.50% water.