Kilmarnock is a town in Lancaster and Northumberland counties in the U.S. Commonwealth of Virginia. The population was 1,445 at the 2020 census. It is located near the mouth of the Rappahannock River and is located within the Northern Neck George Washington Birthplace American Viticultural Area winemaking appellation. There is a small hospital in the town. Lancaster Middle School, grades 4–8, is also located in town. Approximately 500 students attend the school.

The town was named after Kilmarnock, in Scotland.

Kilmarnock is located at 37°42′45″N 76°22′54″W / 37.71250°N 76.38167°W / 37.71250; -76.38167 (37.712437, -76.381707).

According to the United States Census Bureau, the town has a total area of 2.9 square miles (7.5 km), of which, 2.9 square miles (7.4 km)is land and 0.35% is water.

Kilmarnock hosts the Holly Ball, a debutante ball founded in 1895, at the Indian Creek Yacht and Country Club every December.

Historical population

Census	Pop.	Note	%±
1880	59		—
1940	614		—
1950	689		12.2%
1960	927		34.5%
1970	841		−9.3%
1980	945		12.4%
1990	1,109		17.4%
2000	1,244		12.2%
2010	1,487		19.5%
2020	1,445		−2.8%
U.S. Decennial Census

As of the 2020 census, the total population is 1,445. The town has 802 total housing units, with 687 occupied and 645 of those belonging to families. 115 houses were vacant. 54.7% of homes were owned instead of rented. Of the population, 926 are white, 446 are black, 37 are mixed race, 18 are Hispanic or Latino, 17 are Asian, 3 are American Indian, 1 is Hawaiian, and 15 are some other race.

The median age in Kilmarnock is 60.2. 42% of the population is 65 years or older. 10.7% of the population is a veteran, with 89% of those being male. 23.1% of the population had a bachelor's degree or other form of higher education.

The median household income was $36,875. 29.4% of the population was below the poverty line, 77.4% of which were under 18. 23.9% of the remainder was between 18 and 64 while the remaining 17.4% was 65 or older. The median income for families is $44,242 while for married-couple families it is $71,125 and $25,677 for non-family households.

• Rappahannock Record - local newspaper