|— Town —|
|Country||United States of America|
|• Total||0.49 sq mi (1.27 km2)|
|• Land||0.49 sq mi (1.27 km2)|
|• Water||0 sq mi (0 km2)|
|Elevation||554 ft (169 m)|
|• Estimate (2011)||175|
|• Density||351.0/sq mi (135.5/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||0589696|
Barnesville is located at .(39.221975, -77.377813)
 2010 census
As of the census of 2010, there were 172 people, 67 households, and 55 families residing in the town. The population density was 351.0 inhabitants per square mile (135.5 /km2). There were 71 housing units at an average density of 144.9 per square mile (55.9 /km2). The racial makeup of the town was 91.3% White, 2.3% African American, 1.7% Native American, 0.6% Asian, and 4.1% from two or more races. Hispanic or Latino of any race were 1.2% of the population.
There were 67 households out of which 40.3% had children under the age of 18 living with them, 67.2% were married couples living together, 4.5% had a female householder with no husband present, 10.4% had a male householder with no wife present, and 17.9% were non-families. 17.9% of all households were made up of individuals and 9% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 2.89.
The median age in the town was 48 years. 25.6% of residents were under the age of 18; 3.4% were between the ages of 18 and 24; 13.4% were from 25 to 44; 40.2% were from 45 to 64; and 17.4% were 65 years of age or older. The gender makeup of the town was 48.8% male and 51.2% female.
 2000 census
As of the census of 2000, there were 161 people, 59 households, and 49 families residing in the town. The population density was 330.7 people per square mile (126.9/km²). There were 65 housing units at an average density of 133.5 per square mile (51.2/km²). The racial makeup of the town was 96.89% White, 1.86% African American, and 1.24% from two or more races. Hispanic or Latino of any race were 0.62% of the population.
There were 59 households out of which 37.3% had children under the age of 18 living with them, 71.2% were married couples living together, 6.8% had a female householder with no husband present, and 15.3% were non-families. 11.9% of all households were made up of individuals and 5.1% had someone living alone who was 65 years of age or older. The average household size was 2.73 and the average family size was 2.98.
In the town the population was spread out with 28.0% under the age of 18, 3.7% from 18 to 24, 27.3% from 25 to 44, 26.7% from 45 to 64, and 14.3% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 94.0 males. For every 100 females age 18 and over, there were 96.6 males.
The median income for a household in the town was $78,791, and the median income for a family was $79,581. Males had a median income of $52,188 versus $50,625 for females. The per capita income for the town was $38,001. None of the population or families were below the poverty line.
 Town Government
The Town of Barnesville is an incorporated municipality in Montgomery County in the State of Maryland. Management of the town's affairs is the responsibility of three Commissioners, elected biannually. The Commissioners select from among them a President who is informally known as the Mayor of the Town.
Elected in May 2005 were Pete Menke, Bonnie Brown, and Luke Fedders. Pete Menke was again selected as the President of the Commissioners for the 2005 - 2007 session.
 Past Presidents of Commission
- 1948-1950 Mary Morningstar
- 1950 L. B. Moon
- 1950-1959 Mark P. Jeffers
- 1959-1963 Harold Cooley
- 1963-1965 Leslie Tod Luhn
- 1965-1969 Elizabeth H. Tolbert
- 1969-1971 Jerome Offutt
- 1971-1975 George Wood
- 1975-2001 Elizabeth H. Tolbert
- 2001-2008 Peter T. Menke
- 2008 - Current Luke Fedders
 Barnesville community
At the top of a ridge with views of Sugarloaf Mountain to the north and the Catoctin Mountain and Blue Ridge ranges to the west, Barnesville enjoys a connection with the rhythms of the natural world while being within commuting distance of the nation's capital. The town's motto, "A Caring Community", is a testament to the sense of place enjoyed by the town's residents and their neighbors in the Agricultural Reserve of Western Montgomery County.
Barnesville is served by the Montgomery County Public Schools.
Schools that serve Barnesville include:
- The Barnesville School, a private school for children who are three years of age through eighth grade
- Monocacy Elementary School
- John Poole Middle School
- Poolesville High School
- "US Gazetteer files 2010". United States Census Bureau. Retrieved 2013-01-25.
- "American FactFinder". United States Census Bureau. Retrieved 2013-01-25.
- "Population Estimates". United States Census Bureau. Retrieved 2013-01-25.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.