|Area||0.665 sq mi (1.72 km2)|
|- land||0.665 sq mi (2 km2)|
|- water||0 sq mi (0 km2), 0%|
|Density||2,627.1 / sq mi (1,014.3 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Area code||847 and 224|
Knollwood is an unincorporated census-designated place in Lake County, Illinois. It is located within Shields Township and Libertyville Township. Knollwood shares a postal code with the neighboring village of Lake Bluff, and children attend Lake Bluff schools. The residents of Knollwood are served by the Knollwood Fire Department, Lake County Sheriff's Department. As of 2010, the population of Knollwood was 1,747.
The name "Knollwood" first became associated with the area in the early 20th century. The Chicago, North Shore and Milwaukee railway stop, located at the intersection of Rockland Road and Telegraph Road (now Waukegan Road), was named Creamer Corners. To the southwest of the station was a 248 acre property, consisting of two farms, owned by Mrs. Granger Farwell and Mr. A.C. Accord. This property was known as Knollwood Farm. In 1923, Knollwood Farm was purchased by a group of wealthy Chicago businessmen (Including Samuel Insull, Robert P. Lamont, Nathan William MacChesney and Thomas E. Wilson), who wished to turn the land into a country club. The following year, the Knollwood Country Club was founded, and the purchase was finalized in 1925. The community that sprang up around the club came to be known as Knollwood'
Knollwood's volunteer fire department was founded as the Rockland Fire Department and recognized by the state government in January 1947. Two years later, the department purchased their first fire engine, and a fire department building was constructed in 1951. In 1952, the Rockland Fire Department joined the Illinois Association of Fire Protection Districts, and changed its name to the Knollwood Fire Department. The original firehouse was replaced with a modern facility in the same location in 2002, with the new building opening the following year.
Knollwood is located at.
Knollwood is bordered by the village of Lake Bluff to the north, northeast and southeast. To the northwest, Knollwood is bordered by the city of North Chicago, to the south, the city of Lake Forest and to the west, the village of Green Oaks, and unincorporated Rondout.
As of the 2010 U.S. Census, the population of Knollwood was 1,747 people, occupying 668 households. The racial makeup was 85.52% White, 4.81% Asian, 4.24% African American, 3.84% identifying as another race, and 1.60% identifying as two races or more. Hispanic or Latino people of any race made up 6.35% of the population. Persons aged 0 to 4 years made up 3.49% of the population, while people aged 5 to 17 years made up 16.89%, 18–64 years at 62.51%, and people aged 65 and up at 17.12%. Men made up 47.45% of the population, while Women made up 52.55%.
U.S. Route 41 passes through the eastern part of Knollwood, though several sections fall within the boundaries of Lake Bluff. Portions of Illinois Route 43 (Waukegan Road) and Illinois Route 176 (Rockland Road) are also located within Knollwood, although the actual intersection of the two roads currently lies within the boundaries of Lake Bluff.
Knollwood was served by the Mundelein Branch of the Chicago, North Shore and Milwaukee interurban railroad until its abandonment on January 21, 1963. Since then, Knollwood has not been served by passenger rail, though the Lake Bluff Metra Station is located nearby. The Leithton Subdivision of the Canadian National Railway (Formerly the Western Subdivision of the Elgin, Joliet and Eastern Railway) runs through Knollwood, crossing Route 43 at grade. This line was built in the late 1880s as part of the short-lived Waukegan and Southwestern Railway, before it was acquired by the Elgin, Joliet and Eastern in 1891.
Knollwood residents are served by Lake Bluff School District 65, and Lake Forest High School District 115. Public school students receive their elementary education (Kindergarten through Fifth grade) at Lake Bluff Elementary School, middle school education (Sixth grade through Eighth grade) at Lake Bluff Middle School and high school education (Ninth grade through Twelfth grade) at Lake Forest High School. The defunct Lake Bluff West Elementary School (Intended for children living in Knollwood and western Lake Bluff) was also located in Knollwood. The school was constructed in 1962 and opened in 1963. In 1994, District 65 vacated the building, and it currently serves as headquarters for the Shields Township supervisor.
- "American FactFinder". U.S. Census Bureau. Retrieved 15 March 2011.
- Teter, Lucius. "Club History". Knollwood Club. Retrieved December 22, 2012.
- "Knollwood Facts". Knollwood Neighbors. Retrieved December 22, 2012.
- "Knollwood Facts". Knollwood Neighbors. Retrieved December 22, 2012., although the Knollwood Club currently lies within the boundaries of Lake Forest, Illinois
- "Founding". Knollwood Fire Department. Retrieved December 23, 2012.
- "Our Station". Knollwood Fire Department. Retrieved December 23, 2012.
- David Ibata (October 5, 1988). "High Court Shuns Knollwood's Appeal". Chicago Tribune. Retrieved December 22, 2012. "Felknor referred to a 1982 referendum in which Lake Bluff residents voted down a Knollwood annexation by three votes out of 1,600 cast."
- Stephania H. Davis (November 26, 1996). "Annexation Battle Leaves Scars In, Near Lake Bluff". Chicago Tribune. Retrieved December 22, 2012. "But Nov. 5, Lake Bluff residents voted overwhelmingly against the annexation in an advisory referendum, defeating the measure 2,099 to 903."
- Hedien, Laura. "Stations and Stops". Retrieved December 23, 2012.
- Jaenicke, Paul W.; Ralph A. Eisenbrandt (2007). Elgin, Joliet and Eastern Railway. Arcadia Publishing. p. 7.