Park Ridge is a city in Cook County, Illinois, United States, and a Chicago suburb. Per the 2020 census, the population was 39,656. It is located 15 miles (24 km) northwest of downtown Chicago. It is close to O'Hare International Airport, major expressways, and rail transportation. It is a part of the Chicago metropolitan area, bordering three official neighborhoods on Chicago's Far Northwest Side (Edison Park, Norwood Park, and O'Hare.)
 The soil is abundant with clay deposits, which made it a brick-making center for the developing city of Chicago. Park Ridge was originally called Pennyville to honor George Penny, the businessman who owned the local brickyard along with Robert Meacham. Later it was named Brickton. The Des Plaines River divides Park Ridge from neighboring Des Plaines, Illinois, which is west of Park Ridge. Chicago is south and east of Park Ridge, and Niles and unincorporated Maine Township are to its north.
 The area of Park Ridge was inhabited by the Potawatomie until they were removed in 1833. The area was a convenient portage between the Des Plaines and Chicago rivers for the French explorers and in the early 1830s, the first settlers arrived from New England and New York. In 1854 George Penny established a brickworks in the area. Due to the brickwork and the abundance of clay, Park Ridge was nicknamed "Brickton" by locals. In 1910 Park Ridge had a population of 2,009. In 1930 the population was 10,417. In 1950 the population was 16,602. In 1960 the population was 32,625, with 99.9% of the population white. There were five African-Americans and 31 people classed other than black or white. By 1970, the population had risen to 42,466. In 2016, graduate of the first class of Park Ridge's Maine Township High School South (1965) former First Lady Hillary Rodham Clinton, campaigned as the Democratic candidate for President of the United States. 
 According to the 2021 census gazetteer files, Park Ridge has a total area of 7.14 square miles (18.49 km2), of which 7.09 square miles (18.36 km2) (or 99.34%) is land and 0.05 square miles (0.13 km2) (or 0.66%) is water.
 Park Ridge falls under the USDA 5b Plant Hardiness zone.
 As of the 2020 census there were 39,656 people, 14,384 households, and 10,323 families residing in the city. The population density was 5,557.95 inhabitants per square mile (2,145.94/km2). There were 15,366 housing units at an average density of 2,153.61 per square mile (831.51/km2). The racial makeup of the city was 86.10% White, 4.87% Asian, 0.53% African American, 0.16% Native American, 0.01% Pacific Islander, 1.82% from other races, and 6.51% from two or more races. Hispanic or Latino of any race were 7.20% of the population.
 There were 14,384 households, out of which 32.2% had children under the age of 18 living with them, 59.61% were married couples living together, 9.94% had a female householder with no husband present, and 28.23% were non-families. 25.27% of all households were made up of individuals, and 13.29% had someone living alone who was 65 years of age or older. The average household size was 3.11 and the average family size was 2.56.
 The city's age distribution consisted of 23.5% under the age of 18, 5.7% from 18 to 24, 20.5% from 25 to 44, 29.9% from 45 to 64, and 20.3% who were 65 years of age or older. The median age was 45.2 years. For every 100 females, there were 95.3 males. For every 100 females age 18 and over, there were 91.9 males.
 The median income for a household in the city was $113,809, and the median income for a family was $145,995. Males had a median income of $82,222 versus $51,371 for females. The per capita income for the city was $58,978. About 2.4% of families and 3.9% of the population were below the poverty line, including 3.0% of those under age 18 and 3.8% of those age 65 or over.
 Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.
 Park Ridge is served by the Park Ridge-Niles School District 64, which has its headquarters in the Raymond E. Hendee Educational Service Center in Park Ridge. Area middle schools include Lincoln Middle School and Emerson Middle School in Niles. At one point there were nine public K–6 elementary schools: Oakton, Madison, Edison, Merrill, Carpenter, Field, Franklin, Roosevelt, and Washington. Only the latter five remain today, and all are in Park Ridge.  Jefferson School is also part of the district and houses the special needs preschool for children ages 3 and 4.
K-5 after-school programs are hosted by the Park Ridge Park District.
 St. Paul of the Cross and Mary Seat of Wisdom are the two Catholic elementary schools. St. Andrews is a Lutheran elementary school.
 The town is served by Maine Township High School District 207, which includes Maine South High School, and Maine East High School. Students who live in northern Park Ridge have the option of attending either Maine East or Maine South. Maine West High School is located to the west in Des Plaines. Maine North High School was a school in unincorporated Maine Township and part of Maine Township High School District 207. It closed in 1981 as the student population of Maine Township shrank.
 District 207 shares student-run radio and television stations operating with the call letters WMTH-FM (W Maine Township High).  Actor Harrison Ford, known for his roles in the Indiana Jones, Star Wars, and Blade Runner movies, went to Maine East, and has been credited as being the radio station's first sports announcer. Since 2007, WMTH Radio can be heard live on any of the district high school homepage.
 The town is a part of the Oakton Community College district.
 Park Ridge is home to the Park Ridge Falcons, the 2002 Pop Warner Football Tomlin Division Pee Wee National Champions.
 Park Ridge is home to three American Youth Football National Champions (2006, 2007, 2009) and one American Youth Cheerleading National Champion (2007).
 The Maine South Hawks football team were State Champions in 1995, 2000, 2008, 2009, 2010 and 2016, and Runners-up in 2003, 2004, 2005, and 2021.
 According to Park Ridge's 2020 Comprehensive Annual Financial Report, the top employers in the city were:
 Park Ridge is the hometown of Hillary Rodham Clinton. When she visited Park Ridge on the occasion of her 50th birthday in 1997, the city renamed the southeast corner of the intersection of Elm and Wisner streets, next to her childhood home, "Rodham Corner". Clinton graduated from Maine Township High School South, a new school built to accommodate the population of baby boomers coming through at the time.
 Park Ridge is also the hometown of movie stars Carrie Snodgress, Karen Black, Suzanne Snyder and Harrison Ford. All four attended Maine Township High School East. Sean Giambrone also grew up in Park Ridge. He is most notable for his role in The Goldbergs as Adam. He went to Lincoln Middle School and Maine South High School.
 The first U.S. citizen to be canonized, Mother Frances Cabrini, attended St. Paul of the Cross Church and owned a farm at the north edge of Park Ridge.
 Actor Harrison Ford, known for his roles in the Indiana Jones, Star Wars, and Blade Runner movies, went to Maine East, and has been credited as being the radio station's first sports announcer.
 James Pankow, a trombone player, songwriter, composer, and brass instrument player, best known as a founding member of the rock band Chicago.
 Artist Grant Wood once owned a shop in Park Ridge, and he lived in Park Ridge.
 Park Ridge has one sister city:
 Former: Evanston
• Hyde Park
• Jefferson
• Lake
• Lake View
• North Chicago
• Rogers Park
• South Chicago
• West Chicago