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Green Valley, Maryland
Location of Green Valley, Maryland
Location of Green Valley, Maryland
Country  United States
State  Maryland
County Flag of Frederick County, Maryland.png Frederick
 • Total 17.13 sq mi (44.37 km2)
 • Land 17.09 sq mi (44.28 km2)
 • Water 0.04 sq mi (0.09 km2)
397 ft (121 m)
 • Total 12,643
 • Density 739.57/sq mi (285.54/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 census-designated place (CDP) in southern Frederick County, Maryland, United States. The population was 12,643 at the 2020 census. The area was listed as a census-designated place in 2000 but not listed as part of any CDP at the 2010 census. It was re-designated a census-designated place for the 2020 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.


Historical population
Census Pop.
2000 12,262
2020 12,643
U.S. Decennial Census

2020 census

Green Valley CDP, Maryland - Demographic Profile
(NH = Non-Hispanic)
Race / Ethnicity Pop 2020 % 2020
White alone (NH) 10,463 82.54%
Black or African American alone (NH) 297 2.35%
Native American or Alaska Native alone (NH) 18 0.14%
Asian alone (NH) 384 3.04%
Pacific Islander alone (NH) 1 0.01%
Some Other Race alone (NH) 58 0.46%
Mixed Race/Multi-Racial (NH) 599 4.74%
Hispanic or Latino (any race) 850 6.72%
Total 12,643 100.00%

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.

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