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 at the 2000 census. ==History==
The first settlers to the Sycamore-area arrived in 1835 and concentrated themselves mostly north of the Kishwaukee River and the present site of Sycamore. The original town was platted by a New Yorker named Christian Sharer. A mill was constructed and the Kishwaukee dammed but the town failed. By 1837, after some controversy, the location of county seat was settled in favor of Orange, Sycamore's original name, and the settlement moved to the present-day site of the city.
The present-day town site was platted by James Waterman and Evans Wharry in 1837. The first settler at the new site was Carlos Lattin, who preceded the town, having arrived in 1835. Lattin staked a claim that included most of the present west side of the city and erected his first cabin just north of downtown.