As of the census of 2000, there were 9,641 people, 3,443 households, and 2,513 families residing in the city. The population density was 1,633.9 persons per square mile (630.9/km²). There were 3,531 housing units at an average density of 598.4 per square mile (231.1/km²). The racial makeup of the city was 97.42% White, 0.29% African American, 0.17% Native American, 1.21% Asian, 0.01% Pacific Islander, 0.21% from other races, and 0.69% from two or more races. Hispanic or Latino of any race were 0.87% of the population.
There were 3,443 households out of which 46.4% had children under the age of 18 living with them, 60.6% were married couples living together, 9.1% had a female householder with no husband present, and 27.0% were non-families. 20.4% of all households were made up of individuals and 8.0% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.23.
In the city the population was spread out with 32.0% under the age of 18, 8.4% from 18 to 24, 35.5% from 25 to 44, 15.5% from 45 to 64, and 8.7% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 95.7 males. For every 100 females age 18 and over, there were 91.3 males.
The median income for a household in the city was $52,531, and the median income for a family was $61,056. Males had a median income of $39,834 versus $27,476 for females. The per capita income for the city was $22,667. About 3.0% of families and 4.0% of the population were below the poverty line, including 4.7% of those under age 18 and 8.3% of those age 65 or over.
Transportation to and from Sartell is limited to surface roads, mainly U.S. Route 10 and Minnesota State Highway 15, both of which pass along the outskirts of the city. Bus service through St. Cloud Metro Bus runs to destinations within Sartell and neighboring Sauk Rapids and St. Cloud. A rail line passes through town, but serves the city only as freight transportation for the Verso Sartell Paper Mill.
The city's proximity to St. Cloud allows for convenient access to St. Cloud Regional Airport as well as the city's Amtrak and Greyhound stations.
The presence of dams along the Mississippi River and the waterway's relatively shallow depth render it useless for anything more than recreational watercraft traffic. Sartell's location on the river facilitated the construction of the Old Sartell Bridge in 1914, later replaced by the current Sartell Bridge in 1984.