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Green Valley, Maryland
Location of Green Valley, Maryland
Location of Green Valley, Maryland
Country  United States of America
State  Maryland
County Flag of Frederick County, Maryland.png Frederick
 • Total 20.6 sq mi (53.4 km2)
 • Land 20.6 sq mi (53.4 km2)
 • Water 0 sq mi (0.0 km2)
397 ft (121 m)
 • Total 12,262
 • Density 595/sq mi (229.8/km2)
Time zone UTC-5 (Eastern (EST))
 • Summer (DST) UTC-4 (EDT)
FIPS code 24-35412
GNIS feature ID 0588667

Green Valley is an unincorporated area and former census-designated place (CDP) in southern Frederick County, Maryland, United States. The population was 12,262 at the 2000 census. The area was not listed as part of any CDP at the 2010 census.


The Green Valley area is located in southeastern Frederick County at 39°20′30″N 77°14′26″W / 39.34167°N 77.24056°W / 39.34167; -77.24056 (39.341801, -77.240437), bordered to the south by Montgomery County. The northern edge of the CDP extended from Mount Airy in the northeast to New Market in the northwest. The unincorporated community of Monrovia is just to the west.

According to the United States Census Bureau, the Green Valley CDP had a total area of 20.6 square miles (53 km2), all of it land.


As of the census of 2000, there were 12,262 people, 3,882 households, and 3,470 families residing in the CDP. The population density was 595.1 people per square mile (229.8/km²). There were 3,928 housing units at an average density of 190.6/sq mi (73.6/km²). The racial makeup of the CDP was 95.91% White, 1.24% African American, 0.23% Native American, 0.99% Asian, 0.04% Pacific Islander, 0.38% from other races, and 1.22% from two or more races. Hispanic or Latino of any race were 1.69% of the population.

There were 3,882 households out of which 49.1% had children under the age of 18 living with them, 81.7% were married couples living together, 4.6% had a female householder with no husband present, and 10.6% were non-families. 7.8% of all households were made up of individuals and 2.8% had someone living alone who was 65 years of age or older. The average household size was 3.16 and the average family size was 3.33.

In the CDP, the population was spread out with 31.2% under the age of 18, 5.6% from 18 to 24, 30.0% from 25 to 44, 27.5% from 45 to 64, and 5.7% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 102.6 males. For every 100 females age 18 and over, there were 100.6 males.

The median income for a household in the CDP was $81,732, and the median income for a family was $84,607. Males had a median income of $53,482 versus $37,726 for females. The per capita income for the CDP was $29,408. About 1.9% of families and 2.1% of the population were below the poverty line, including 1.4% of those under age 18 and 0.4% of those age 65 or over.

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