Other cities in the 815 area code include: Bourbonnais, Joliet, Freeport, Cherry Valley, Roscoe, Shorewood, Barrington, Rockton, Sterling, Lockport, La Grange Park, Pontiac, Cortland, Sycamore, Manteno, Loves Park, Channahon, Manhattan, Peru, Rochelle, Clarendon Hills, North Chicago, Crystal Lake, Princeton, Caledonia, Richmond, Yorkville, Mchenry, Bolingbrook, Braceville, Manlius, Spring Valley, Wilmington, Poplar Grove, Winnebago, Beecher, Peotone, Dwight, Gardner, Pecatonica, Fox River Grove, Mount Morris, Oglesby, Fairbury, and Rutland.
Rockford is the third largest city in the U.S. state of Illinois, the 171st most populous city in the United States, the largest city in Illinois outside of the Chicago metropolitan area, and the city of the 148th most populous metropolitan area in the United States. It is the county seat of Winnebago County and is located on both banks of the Rock River in far northern Illinois. According to 2010 census data, the City of Rockford had a population of 152,871, with an outlying metropolitan area population of 348,360, which was estimated to have decreased to 150,251 and 344,623, respectively, by July 2013.
149,395 (2016) Joliet (/ ˈ dʒ oʊ l i. ɛ t / or / dʒ oʊ l i ˈ ɛ t /) is a city in Kendall and Will counties in the U.S. state of Illinois, 40 miles (64 km) southwest of Chicago. It is the county seat of Will County. At the 2010 census, the city was the fourth largest in Illinois, with a population of 147,433. A special census done in 2016 puts Joliet's population at 149,395 making it the 3rd largest city in Illinois.
Plainfield is a village in Will County, Illinois, United States. The US Census Bureau estimates the population at 41,734 as of 2013. The village includes land in Plainfield and Wheatland townships. Part of Plainfield is located in Kendall County (Na-Au-Say and Oswego townships). With the growth in the Chicago suburbs in the 1990s and 2000s, the village has seen a population increase, from 4,500 in 1990 to 28,000 in 2000 to over 37,000 in 2007.The village has established a community Preservation Commission and historic preservation ordinance. It is the home of the Lake Renwick Preserve, a county forest preserve used for birdwatching and other activities.
The 815 area code lies within the Central Daylight Time Zone (or CDT). The current time in CDT is 3:33 PM on Jul 11, 2020.