the Washington Park Historic District. On February 8, 1910, William Dickson Boyce, then a resident of Ottawa, incorporated the Boy Scouts of America. Five years later, also in Ottawa, Boyce incorporated the Lone Scouts of America. Boyce is buried in Ottawa Avenue Cemetery. The Ottawa Scouting Museum, on Canal Street, opened to the public on December 6, 1997. The museum features the history of Boy Scouting, Girl Scouting and Camp Fire. In 1922, the Radium Dial Company (RDC) moved from Peru, Illinois to a former high school building in Ottawa. The company employed hundreds of young women who painted watch dials using a paint called "Luna", which contained ionizing radion, for watch maker Westclox. RDC went out of business in 1936, two years after the company's president, Joseph Kelly Sr., left to start a competing company, Luminous Processes Inc., a few blocks away. The employees of the company suffered radiation toxicity, as chronicled in the 1986 documentary, Radium City. Geography According to the 2021 census gazetteer files, Ottawa has a total area of , of which (or 94.46%) is land and (or 5.54%) is water. Climate Industry Because of numerous silica sand deposits (Ottawa sand was on board the ill-fated Columbia space shuttle for experimental purposes) Ottawa has been a major sand and glass center for more than 100 years. Transportation of the sand is facilitated by the navigable Illinois river and the Illinois Railway Ottawa Line. One of its largest employers is Pilkington Glass works, a successor to LOF (Libbey Owens Ford). Formerly concentrated in automotive glass, the plant now manufactures specialty glass and underwent a $50 million renovation in 2006. Ottawa sand continues to be extracted from several quarries in the area, and is recognized in glass-making and abrasives for its uniform granularity and characteristics. Sabic recently purchased GE Plastics, a successor to Borg Warner automotive glass manufacture, operates a large plastics facility in Ottawa, and is a major employer. Ottawa sand is a standard testing medium in geotechnical engineering (laboratory demonstrations and research into new technologies). Demographics As of the 2020 Census, there were 18,840 people, 7,764 households, and 4,658 families living in the city. The population density was . The racial makeup of the city was 86.4% White, 2.5% African American, 0.4% Native American, 1.0% Asian, 2.5% from other races, and 7.1% from two or more races. Hispanic or Latino of any race were 9.5% of