Rock River is a town in Albany County, Wyoming, United States. As of the 2010 census, the town population was 245.
Rock River is located at 41°44′27″N 105°58′29″W (41.740770, -105.974602).
According to the United States Census Bureau, the town has a total area of 2.33 square miles (6.03 km2), all of it land.
As of the census of 2010, there were 245 people, 94 households, and 72 families living in the town. The population density was 105.2 inhabitants per square mile (40.6/km2). There were 126 housing units at an average density of 54.1 per square mile (20.9/km2). The racial makeup of the town was 91.4% White, 0.8% Native American, 2.4% from other races, and 5.3% from two or more races. Hispanic or Latino of any race were 9.0% of the population.
There were 94 households, of which 29.8% had children under the age of 18 living with them, 62.8% were married couples living together, 9.6% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 23.4% were non-families. 21.3% of all households were made up of individuals, and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 2.97.