Collegedale is a suburb of Chattanooga and is part of the Chattanooga, TN–GA Metropolitan Statistical Area. It borders the communities of Ooltewah and Apison.
According to the United States Census Bureau, the city has a total area of 8.3 square miles (21.6 km²), all of it land.
There are 2,049 households out of which 33.3% have children under the age of 18 living with them, 61.0% were married couples living together, 10.7% had a female householder with no husband present, and 25.4% were non-families. 20.5% of all households were made up of individuals and 7.0% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 2.96.
In the city the population was spread out with 19.8% under the age of 18, 25.2% from 18 to 24, 25.4% from 25 to 44, 16.7% from 45 to 64, and 13.0% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 88.5 males. For every 100 females age 18 and over, there were 85.6 males.
The median income for a household in the city was $42,270, and the median income for a family was $52,337. Males had a median income of $37,819 versus $28,345 for females. The per capita income for the city was $18,604. 7.4% of the population and 5.3% of families were below the poverty line. Out of the total population, 10.5% of those under the age of 18 and 4.0% of those 65 and older were living below the poverty line.