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Boulder Hill is a census-designated place (CDP) in Oswego Township, Kendall County, Illinois, United States. The population was 8,108 at the 2010 census. It is an outer suburb of Chicago on the Fox River, south of Aurora.
Boulder Hill is located at 41°42′41″N 88°20′07″W (41.7113530, -88.3351400).
According to the United States Census Bureau, Boulder Hill has a total area of 1.45 square miles (3.8 km2), of which is, 1.44 square miles (3.7 km2) or 99% of its land and 0.01 square miles (0.026 km2) or 1% of its water. Up until the early 2000s, the Boulder Hill subdivision had a small development area, equating to almost a town square. The community itself has a strong identity, as the people from Boulder Hill are not classified as being from Montgomery or Oswego, two nearby larger towns.
Postal service is provided to Boulder Hill via the Montgomery Post Office. While Boulder Hill is unincorporated and not part of the village of Montgomery, there is confusion due to Boulder Hill residents' mailing addresses including "Montgomery" as the designated address. Governmental services provided to Boulder Hill primarily come from either Kendall County or Oswego Township offices.
The community has four churches, a grocery store, a small retail development, a gas station, three schools (two elementary and a middle school), a retirement facility, and the area used to have an automotive dealership.