Oregon is a city in and the county seat of Ogle County, Illinois, United States. The population was 3,721 at the 2010 census.
According to the 2010 census, Oregon has a total area of 2.028 square miles (5.25 km²), of which 1.96 square miles (5.08 km²) (or 96.65%) is land and 0.068 square miles (0.18 km²) (or 3.35%) is water.
As of the census of 2010, there were 3,721 citizens, 1,630 households, and 941 families residing in the city. The population density was 1,998.5 people per square mile (772.2/km²). There were 1,789 housing units at an average density of 880.6 per square mile (340.3/km²). The racial makeup of the city was 95.9% White, .9% African American, 0.1% Native American, 0.8% Asian, 0% Pacific Islander, 1.2% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 4.2% of the population.
There were 1,630 households out of which 22.1% had children under the age of 18 living with them, 42.3% were husband-wife families, 10.9% had a female householder with no husband present, and 42.3% were nonfamily households. 36.3% of householders lived alone, 20.1% of which were female and 16.1% male. The average household size was 2.18 and the average family size was 2.83.
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