According to the 2010 census, McHenry has a total area of , of which (or 97.13%) is land and (or 2.87%) is water. McHenry lies within the Fox River Valley, and its downtown area is situated on that river which is how it earned the nickname "The Heart of the Fox River". Climate and weather Typically climate and weather in McHenry year-round is similar to Chicago's, though sometimes it is warmer in summer, and colder in winter. The all-time record high temperature is , set on July 4, 1974, while the all-time record low is , set on January 31, 2019. Government The city of McHenry lies within two townships: McHenry Township and Nunda Township. The majority of the city falls within the former. Mayor See the full article, List of mayors of McHenry, Illinois. Wayne Jett City Council The city council consists of representatives from the 7 city wards: Ward 1 - Victor A. Santi Ward 2 - Andrew Glab Ward 3 - Frank McClatchey Ward 4 - Ryan Harding Ward 5 - Shawn Strach Ward 6 - Patrick Devine Ward 7 - Sue Miller City Clerk Trisha Ramel is the City Clerk and is supported by the Deputy City Clerk, Monte Johnson. City Administrator Derik Morefield Police Chief John Birk Demographics 2020 census 2000 Census The population density was . There were 8,127 housing units at an average density of . The racial makeup of the city was 94.18% White, 0.35% African American, 0.21% Native American, 0.89% Asian, 0.04% Pacific Islander, 3.31% from other races, and 1.02% from two or more races. Hispanic or Latino people of any race were 7.10% of the population. There were 7,872 households, of which 38.7% had children under the age of 18 living with them, 57.2% were married couples living together, 9.7% had a female householder with no husband present, and 29.4% were non-families. 24.7% of all households were made up of individuals, and 9.9% had someone living alone who was 65 years of age or older. The average household size was 2.70 and the average family size was 3.25. Age distribution was 28.5% under the age of 18, 7.8% from 18 to 24, 32.7% from 25 to 44, 19.9% from 45 to 64, and 11.0% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 94.8 males. For every 100 females