Sterling is also served by railroads, although only freight carriers serve the town. The main rail operator is Burlington Northern Santa Fe (BNSF), but other operators, like Union Pacific, serve Sterling as well. The closest Amtrak station is located in Fort Morgan, about 47 miles (75 km) away.
As of the census of 2000, there were 11,360 people, 4,604 households, and 2,790 families residing in the city. The population density was 1,653.1 people per square mile (638.4/km²). There were 5,171 housing units at an average density of 752.5/sq mi (290.6/km²). The racial makeup of the city was 90.75% Caucasian American, 0.75% African American, 0.79% Native American, 0.41% Asian, 0.08% Pacific Islander, 5.60% from other races, and 1.62% from two or more races. Hispanic or Latino of any race were 14.20% of the population.
There were 4,604 households out of which 30.6% had children under the age of 18 living with them, 46.2% were married couples living together, 10.8% had a female householder with no husband present, and 39.4% were non-families. 34.1% of all households were made up of individuals and 14.7% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 3.03.
In the city the population was spread out with 25.5% under the age of 18, 12.9% from 18 to 24, 25.5% from 25 to 44, 19.6% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 94.7 males. For every 100 females age 18 and over, there were 91.2 males.
The median income for a household in the city was $27,337, and the median income for a family was $39,103. Males had a median income of $27,921 versus $20,508 for females. The per capita income for the city was $15,287.
Crosson Field Municipal Airport serves Sterling, but there are no scheduled flights available from there. The closest airport served by scheduled flights is Denver International Airport, located 121 miles (193 km) away.