Sycamore is a city in DeKalb County, Illinois, United States. It has a commercial district based and centered on Illinois Route 64. The population was 17,519 at the 2010 census, up from 12,020 in 2000. Sycamore is the county seat of DeKalb County and was named after the sycamore tree.
Sycamore is located along Illinois Route 64 (State Street in Sycamore) about 35 miles (56 km) southeast of Rockford and 55 miles (89 km) west-northwest of Chicago. It is along the south bank of the East Branch of the South Branch Kishwaukee River in DeKalb County.
According to the 2010 census, Sycamore has a total area of 9.768 square miles (25.30 km), of which 9.73 square miles (25.20 km) (or 99.61%) is land and 0.038 square miles (0.10 km) (or 0.39%) is water. The terrain in Sycamore and the surrounding area is gently rolling and contains rich soil which was originally heavily forested.
As of the census of 2000, there were 12,020 people, 4,692 households, and 3,148 families residing in the city. The population density was 2,191.6 people per square mile (846.9/km²). There were 4,925 housing units at an average density of 898.0 per square mile (347.0/km²). The racial makeup of the city was 93.39% White, 2.74% African American, 0.22% Native American, 0.83% Asian, 0.02% Pacific Islander, 1.56% from other races, and 1.24% from two or more races. Hispanic or Latino of any race were 4.27% of the population.
There were 4,692 households out of which 36.6% had children under the age of 18 living with them, 53.9% were married couples living together, 9.8% had a female householder with no husband present, and 32.9% were non-families. 27,4% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.13.
In the city, the population was spread out with 28.0% under the age of 18, 8.3% from 18 to 24, 31.3% from 25 to 44, 21.5% from 45 to 64, and 10.9% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 95.7 males. For every 100 females age 18 and over, there were 93.4 males.
The median income for a household in the city was $51,921, and the median income for a family was $62,083. Males had a median income of $42,676 versus $27,520 for females. The per capita income for the city was $23,112. About 2.3% of families and 3.7% of the population were below the poverty line, including 4.3% of those under age 18 and 4.6% of those age 65 or over.
Sycamore Illinois neighborhoods include: Arrowhead Acres, Briar Cliff Townhouse, Edgebrook Lane, Fair Street, Heron Creek, Krpans Parkside Estates, Maness, North Grove Crossings, Reston Ponds, River Edge Phase 2, Stonehenge Condo, Stone Prairie, Sycamore, Townsend Woods, Walnut