Sycamore, Illinois

Sycamore, Illinois
Downtown Sycamore, looking west from the intersection of State and Main streets
Interactive map of Sycamore, Illinois
Sycamore
Sycamore
Coordinates: 42°00′32″N 88°40′28″W / 42.00889°N 88.67444°W / 42.00889; -88.67444
CountryUnited States
StateIllinois
CountyDeKalb
Named afterSycamore tree
Area
 • Total
10.18 sq mi (26.36 km2)
 • Land10.12 sq mi (26.21 km2)
 • Water0.058 sq mi (0.15 km2)
Elevation
824 ft (251 m)
Population
 (2020)
 • Total
18,577
 • Density1,835.6/sq mi (708.73/km2)
Time zoneUTC−6 (CST)
 • Summer (DST)UTC−5 (CDT)
ZIP code
60178
Area code815
FIPS code17-74223
GNIS feature ID2396018
Websitewww.cityofsycamore.com

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 18,577 at the 2020 census, up from 17,419 at the 2010 census. Sycamore is the county seat of DeKalb County and was named after the sycamore tree.