|Elevation||79 ft (24.1 m)|
|Area||1.05 sq mi (2.72 km2)|
|- land||0.97 sq mi (2.51 km2)|
|- water||0.09 sq mi (0.23 km2)|
|Density||359.3 / sq mi (138.7 / km2)|
|- summer (DST)||CDT (UTC-5)|
Riley J. Wilson, who held Louisiana's 5th congressional district seat from 1915 to 1937, resided in Harrisonburg, where he was principal of Harrisonburg High School and then an attorney, district attorney, and state district court judge prior to his election to Congress.
Fort Beauregard, located on a bluff in the northern corner of the village, was a Confederate stronghold during the American Civil War. In 1863, the fort successfully defended Harrisonburg from the attack of four Union gunboats coming from the Black River to the Ouachita River. After four days of bombardment, little damage was done, and the gunboats retired down river.
The village of Harrisonburg formerly staged reenactments at Fort Beauregard, also known as Fort Hill, but those ceremonies ended in the late 20th century.
Harrisonburg was once a trade capital because of its location on the Ouachita River, with easy access to the Mississippi River and New Orleans. The Harrisonburg Road ran through the area as it crossed Louisiana between Mississippi's Natchez Trace and Texas' El Camino Real.
Harrisonburg is located in northern Catahoula Parish at  on the west bank of the Ouachita River. Louisiana State Highway 8 passes through the village, leading northeast across the Ouachita to Sicily Island, and southwest 18 miles (29 km) to U.S. Route 84 near Catahoula Lake. Jonesville, the largest town in Catahoula Parish, is 10 miles (16 km) south of Harrisonburg via Highway 124.(31.772177, -91.827403),
According to the United States Census Bureau, Harrisonburg has a total area of 1.0 square mile (2.7 km2), of which 0.97 square miles (2.5 km2) is land and 0.077 square miles (0.2 km2), or 8.07%, is water.
As of the census of 2000, there were 746 people, 142 households, and 91 families residing in the village. The population density was 792.5 inhabitants per square mile (306.4/km²). There were 157 housing units at an average density of 166.8 per square mile (64.5/km²). The racial makeup of the village was 43.43% White, 54.83% African American, 1.47% Asian, and 0.27% from two or more races.
There were 142 households out of which 25.4% had children under the age of 18 living with them, 42.3% were married couples living together, 14.8% had a female householder with no husband present, and 35.9% were non-families. 34.5% of all households were made up of individuals and 22.5% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.24.
In the village the population was spread out with 13.4% under the age of 18, 22.4% from 18 to 24, 42.5% from 25 to 44, 12.2% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 30 years. For every 100 females there were 273.0 males. For every 100 females age 18 and over, there were 316.8 males.
The median income for a household in the village was $21,786, and the median income for a family was $31,250. Males had a median income of $15,000 versus $14,167 for females. The per capita income for the village was $6,242, making it the poorest census-designated place in the state. About 17.1% of families and 27.6% of the population were below the poverty line, including 26.2% of those under age 18 and 25.7% of those age 65 or over.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Harrisonburg has a humid subtropical climate, abbreviated "Cfa" on climate maps.
- "Find a County". National Association of Counties. Retrieved 2011-06-07.
- "Geographic Identifiers: 2010 Demographic Profile Data (G001): Harrisonburg village, Louisiana". U.S. Census Bureau, American Factfinder. Retrieved August 20, 2014.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 151.
- John D. Winters, The Civil War in Louisiana, Baton Rouge: Louisiana State University Press, 1963, ISBN 0-8071-0834-0, p. 197
- Monroe News-Star, May 21, 2007
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015.
- "Census of Population and Housing". Census.gov. Retrieved June 4, 2015.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- Climate Summary for Harrisonburg, Louisiana
- Harrisonburg Progress Community Progress Site for Harrisonburg, LA