Robertson County is a county located in the U.S. Commonwealth of Kentucky. As of the 2020 census, the population was 2,193.^[1] Its county seat is Mount Olivet.^[2] The county is named for George Robertson, a Kentucky Congressman from 1817 to 1821. It is Kentucky's smallest county by both total area and by population.

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Robertson County
County
Robertson County Courthouse in Mount Olivet
Location within the U.S. state of Kentucky
Kentucky's location within the U.S.
Coordinates: 38°31′N 84°03′W
Country	United States
State	Kentucky
Founded	1867
Named for	George Robertson
Seat	Mount Olivet
Largest city	Mount Olivet
Area
• Total	100 sq mi (300 km2)
• Land	100 sq mi (300 km2)
• Water	0.2 sq mi (0.5 km2)  0.2%
Population  (2020)
• Total	2,193
• Estimate  (2023)	2,313
• Density	22/sq mi (8.5/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	6th
Website	www.robertsoncounty.ky.gov

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Robertson County was formed on February 11, 1867, from portions of Bracken County, Harrison County, Mason County and Nicholas County. It was named after George Robertson, a judge and member of Congress.^[3]

According to the U.S. Census Bureau, the county has a total area of 100 square miles (260 km²), of which 100 square miles (260 km²) is land and 0.2 square miles (0.52 km²) (0.2%) is water.^[5] It is the smallest county by area in Kentucky.^[6]

At the 2000 census there were 2,266 people, 866 households, and 621 families in the county, making it the least populated county in the state. The population density was 23 per square mile (8.9/km²). There were 1,034 housing units at an average density of 10 per square mile (3.9/km²). The racial makeup of the county was 98.63% White, 0.04% Black or African American, 0.04% Native American, 0.22% from other races, and 1.06% from two or more races. 0.93% of the population were Hispanic or Latino of any race.^[13] Of the 866 households 31.10% had children under the age of 18 living with them, 57.60% were married couples living together, 9.10% had a female householder with no husband present, and 28.20% were non-families. 24.70% of households were one person and 11.10% were one person aged 65 or older. The average household size was 2.54 and the average family size was 3.00.

The age distribution was 23.80% under the age of 18, 6.70% from 18 to 24, 27.10% from 25 to 44, 25.50% from 45 to 64, and 16.90% 65 or older. The median age was 40 years. For every 100 females there were 94.80 males. For every 100 females age 18 and over, there were 92.50 males.

The median household income was $30,581 and the median family income was $35,521. Males had a median income of $27,656 versus $20,476 for females. The per capita income for the county was $13,404. About 17.50% of families and 22.20% of the population were below the poverty line, including 30.30% of those under age 18 and 24.10% of those age 65 or over.

• National Register of Historic Places listings in Robertson County, Kentucky