Rochester is a city on the north side of the Detroit Metropolitan Area, in Oakland County, in the U.S. state of Michigan. The population was 12,711 at the 2010 census.
According to the United States Census Bureau, the city has a total area of 3.83 square miles (9.92 km), all land. Since an annexation of a section of Avon Township (now Rochester Hills), the city has an eastern boundary that extends to the border with Macomb County.
As of 2000 the median income for a household in the city was $65,179, and the median income for a family was $92,078. Males had a median income of $62,486 versus $37,107 for females. The per capita income for the city was $36,989. About 0.6% of families and 2.7% of the population were below the poverty line, including 1.0% of those under age 18 and 5.9% of those age 65 or over.
As of the census of 2010, there were 12,711 people, 5,514 households, and 3,195 families residing in the city. The population density was 3,318.8 inhabitants per square mile (1,281.4/km). There were 5,994 housing units at an average density of 1,565.0 per square mile (604.2/km). The racial makeup of the city was 88.6% White, 3.7% African American, 0.2% Native American, 5.5% Asian, 0.6% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 2.7% of the population.
There were 5,514 households of which 30.9% had children under the age of 18 living with them, 47.3% were married couples living together, 7.7% had a female householder with no husband present, 2.9% had a male householder with no wife present, and 42.1% were non-families. 35.5% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 3.09.
The median age in the city was 38.3 years. 25.1% of residents were under the age of 18; 7.6% were between the ages of 18 and 24; 29.4% were from 25 to 44; 26.4% were from 45 to 64; and 11.5% were 65 years of age or older. The gender makeup of the city was 48.0% male and 52.0% female.