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Batavia () is a city mainly in Kane County and partly in DuPage County in the U.S. state of Illinois. Located in the Chicago metropolitan area, it was founded in 1833 and is the oldest city in Kane County. Per the 2020 census, the population was 26,098.During the latter part of the 19th century, Batavia, home to six American-style windmill manufacturing companies, became known as "The Windmill City." Fermi National Accelerator Laboratory, a federal government-sponsored high-energy physics laboratory, where both the bottom quark and the top quark were first detected, is located just east of the city limits. Batavia is part of a vernacular region known as the Tri-City area, along with St. Charles and Geneva, all western suburbs of similar size and relative socioeconomic condition.

The Batavia Depot Museum is a museum in Batavia, Illinois that was once the town's primary train station. It was the first of many depots built by the Chicago, Burlington and Quincy Railroad. It was listed on the National Register of Historic Places in 1979 as the Chicago, Burlington, and Quincy Railroad Depot.

The United Methodist Church of Batavia is a historical church in Batavia, Illinois. Funds for the church were donated by Rev. E. H. Gammon and Cpt. Don Carlos Newton in 1887 to replace the First Methodist Church of Batavia. It was designed by famed local architect Solon Spencer Beman in the Romanesque Revival style. It was added to the National Register of Historic Places in 1983.

The First Methodist Church of Batavia is a historic building in Batavia, Illinois. It functioned as a Methodist church until the 1880s. The building was then converted into the McWayne School Annex, which held classes until 1978. It was listed on the National Register of Historic Places in 1982.

The Louise White School is a Registered Historic Place in Batavia, Illinois. It was in active use as a school for 85 years, and served as home of the Chautauqua movement in north central Illinois.

Batavia Public School District 101 (BPS101) is a school district headquartered in Batavia, Illinois. The district is run by a superintendent and is overseen by a seven-member elected school board.Batavia previously had two school districts serving western and eastern portions; they combined into BPS101 in 1911.

The Eastside Community Center, formerly the Catholic Holy Cross Church, is an historic building in Batavia, Illinois. It was built in 1897 to serve the Holy Cross congregation of Batavia, many of whom were Irish immigrants who came to work in local quarries. The building operated as a church until the 1990s, when the property was transferred to the Batavia Park District. It was added to the National Register of Historic Places in 1999.

The Judge Isaac Wilson House is a historic residence in Batavia, Illinois. It was the home of Isaac Wilson, a former Congressman who moved to the Batavia region and later named the settlement. It was added to the National Register of Historic Places in 1985.

The Batavia Institute is a Registered Historic Place in Batavia, Illinois, US.

The Mrs. A. W. Gridley House is a Frank Lloyd Wright designed Prairie School home in Batavia, Illinois.

Batavia Township is in Kane County, Illinois. It is divided by the Fox River. As of the 2010 census, its population was 35,221 and it contained 12,892 housing units. The western part of the United States Department of Energy's Fermilab is at the township's eastern edge (formerly in the village of Weston), although most of the facility is in neighboring Winfield Township in DuPage County.

The Tri-Cities, or Tri-City area, is a vernacular region that is situated between the large cities of Aurora and Elgin, Illinois, and encompasses the cities of Batavia, Geneva, and St. Charles. A "vernacular region" is a distinctive area where the inhabitants collectively consider themselves interconnected by a shared history, mutual interests, and a common identity. Such regions are "intellectual inventions" and a form of shorthand to identify things, people, and places. Vernacular regions reflect a "sense of place," but rarely coincide with established jurisdictional borders.The Tri-City area is primarily located in Kane County, though Batavia and St. Charles include parcels in DuPage County. The three communities are often grouped together due to their shared history, close proximity on the Fox River, relative socioeconomic condition, and similar population sizes. They are among the oldest in Kane County as well as the state.