Oregon is a city in and the county seat of Ogle County, Illinois, United States. The population was 3,518 in 2017.
According to the 2010 census, Oregon has a total area of 2.028 square miles (5.25 km), of which 1.96 square miles (5.08 km) (or 96.65%) is land and 0.068 square miles (0.18 km) (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.
In the city, the age distribution of the population shows 79.6% over the age of 18, with 19.6% aged 65 years or older. The median age was 43.5 years.
The median income for a household in the city was $47,971 and the median income for a family was $60,625. Males employed full-time had a median income of $49,958 versus $29,792 for females. The per capita income for the city was $24,832.
11.9% of all residents lived below the poverty level, including 11.6% of families with related children under the age of 18. Of families with a female householder with related children under 18 years and no husband present, 34.4% lived below the poverty line.