Mount Airy is a town in Carroll and Frederick counties in the U.S. state of Maryland. It is part of both the Washington Metropolitan Area and Baltimore Metropolitan Area. As of the 2010 census the population was 9,288.
Mount Airy is located on the border between Frederick and Carroll counties, in the far eastern part of Frederick County and the southwest corner of Carroll County. Maryland Route 27 (Ridge Road) runs through the east side of the town, leading northeast 16 miles (26 km) to Westminster, the Carroll County seat, and southwest 14 miles (23 km) to Interstate 270 in Germantown. Interstate 70 forms the southern border of Mount Airy, and leads east 32 miles (51 km) to Baltimore and west 14 miles (23 km) to Frederick.
Mount Airy’s Main Street, formerly MD 27 and now Maryland Route 808, runs atop Parrs Ridge in a northeast-southwest direction with elevations ranging between 800 and 850 feet (240 and 260 m). Numerous valleys that extend outward toward the east and west from this ridge give the town its unusually hilly topography. Mount Airy straddles the division of two major drainage basins. Within the Frederick County portion of the town are the headwaters of Woodville Branch and Ben’s Branch which are parts of the Linganore Creek watershed, as well as the headwaters of Bush Creek in the southwestern part of the town. The Linganore watershed drains into Lake Linganore, a secondary source of public water for Frederick County. The Linganore and Bush Creek watersheds are part of the Lower Monocacy River watershed, with eventual drainage to the Potomac River. The east side of Mount Airy drains via tributaries of Middle Run and the South Branch of the Patapsco River to Baltimore Harbor. Both the Potomac and the Patapsco are part of the Chesapeake Bay watershed.
According to the U.S. Census Bureau, the town of Mount Airy has a total area of 4.13 square miles (10.70 km), of which 4.12 square miles (10.67 km) is land and 0.01 square miles (0.03 km), or 0.29%, is water.
As of the census of 2010, there were 9,288 people, 3,107 households, and 2,453 families residing in the city. The population density was 2,254.4 inhabitants per square mile (870.4/km). There were 3,225 housing units at an average density of 782.8 per square mile (302.2/km). The racial makeup of the town was 92.1% White, 2.4% African American, 0.2% Native American, 2.2% Asian, 0.9% from other races, and 2.1% from two or more races. Hispanic or Latino of any race were 4.7% of the population.
There were 3,107 households of which 50.1% had children under the age of 18 living with them, 65.2% were married couples living together, 9.3% had a female householder with no husband present, 4.4% had a male householder with no wife present, and 21.0% were non-families. 16.7% of all households were made up of individuals and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.97 and the average family size was 3.36.
The median age in the city was 36.1 years. 32% of residents were under the age of 18; 6.1% were between the ages of 18 and 24; 28.2% were from 25 to 44; 25.4% were from 45 to 64; and 8.3% were 65 years of age or older. The gender makeup of the town was 48.5% male and 51.5% female.
As of the census of 2000, there were 6,425 people, 2,123 households, and 1,717 families residing in the city. The population density was 1,678.5 people per square mile (647.7/km²). There were 2,179 housing units at an average density of 569.3 per square mile (219.7/km²). The racial makeup of the town was 94.71% White, 2.58% African American, 0.23% Native American, 0.87% Asian, 0.25% from other races, and 1.35% from two or more races. Hispanic or Latino of any race were 1.34% of the population. 24% of Mount Airy’s residents were German, 19% Irish, 12% English, 7% Italian, 4% Scottish, 3% French, 3% Black or African-American, 2% Dutch, 2% Polish and 2% Welsh. People of Scotch-Irish, British, Ukrainian, Yugoslavian, Russian, French-Canadian, Czech, Swedish and Norwegian descent each comprised 1% of the population.
There were 2,123 households out of which 51.4% had children under the age of 18 living with them, 69.0% were married couples living together, 8.5% had a female householder with no husband present, and 19.1% were non-families. 14.9% of all households were made up of individuals and 5.2% had someone living alone who was 65 years of age or older. The average household size was 3.02 and the average family size was 3.37.
In the city the population was spread out with 34.4% under the age of 18, 5.4% from 18 to 24, 37.1% from 25 to 44, 16.9% from 45 to 64, and 6.2% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 98.5 males. For every 100 females age 18 and over, there were 93.2 males.
The median income for a household in the city was $66,967, and the median income for a family was $76,214. Males had a median income of $52,177 versus $35,054 for females. The per capita income for the city was $25,380. About 2.0% of families and 3.3% of the population were below the poverty line, including 4.4% of those under age 18 and 1.8% of those age 65 or over.