According to the United States Census Bureau, the city has a total area of ; is land and is water. Rockville, including the former Rockville Township, is located in Township 123 North of the Arkansas Base Line and Range 29 West of the Fifth Principal Meridian.
As of the census of 2010, there were 2,448 people, 880 households, and 703 families living in the city. The population density was. There were 1,041 housing units at an average density of. The racial makeup of the city was 91.9% White, 0.3% African American, 0.2% Native American, 0.2% Asian, 0.5% Pacific Islander, 6.1% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 9.3% of the population. There were 880 households of which 37.0% had children under the age of 18 living with them, 68.8% were married couplesliving together, 6.5% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 20.1% were non-families. 14.4% of all households were made up of individuals and 4.8% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.04. The median age in the city was 40.5 years. 25.8% of residents were under the age of 18; 8.2% were between the ages of 18 and 24; 23.5% were from 25 to 44; 31.1% were from 45 to 64; and 11.4% were 65 years of age or older. The gender makeup of the city was 51.9% male and 48.1% female.
2000 census
As of the census of 2000, there were 749 people, 268 households, and 187 families living in the city. The population density was 1,140.7 people per square mile. There were 281 housing units at an average density of 427.9 per square mile. The racial makeup of the city was 94.53% White, 1.34% African American, 0.13% Native American, 3.20% from other races, and 0.80% from two or more races. Hispanic or Latino of any race were 6.54% of the population. There were 268 households out of which 44.8% had children under the age of 18 living with them, 58.2% were married couples living together, 7.1% had a female householder with no husband present, and 30.2% were non-families. 23.1% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.79 and the average family size was 3.33. In the city, the population was spread out with 31.5% under the age of 18, 11.1% from 18 to 24, 37.0% from 25 to 44, 13.9% from 45 to 64, and 6.5% who were 65 years of age or older. The median age was 29 years. For every 100 females, there were 106.3 males. For every 100 females age 18 and over, there were 113.8 males. The median income for a household in the city was $43,854, and the median income for a family was $50,083. Males had a median income of $31,964 versus $22,000 for females. The per capita income for the city was $16,527. About 2.1% of families and 4.8% of the population were below the poverty line, including 3.0% of those under age 18 and none of those age 65 or over.
Infrastructure
Transportation
serves as a main route in the city, and Interstate 94 is nearby.
