According to theU.S. Census Bureau, the county has a total area of 635 square miles (1,640 km2), of which 634 square miles (1,640 km2) is land and 1.0 square mile (2.6 km2) (0.2%) is water.[6]
As of the2020 census, the population was 16,611.[12] Thepopulation density was 26.2 people per square mile (10.1 people/km2). There were 7,156 housing units at an average density of 11.3 units per square mile (4.4 units/km2).[13] <0.1% of residents lived in urban areas, while 100.0% lived in rural areas.[14]
The median age was 40.9 years, 24.8% of residents were under the age of 18, and 18.7% of residents were 65 years of age or older. For every 100 females there were 103.1 males, and for every 100 females age 18 and over there were 103.5 males age 18 and over.[13]
There were 6,618 households, of which 28.8% had children under the age of 18 living in them. Of all households, 53.4% were married-couple households, 19.5% were households with a male householder and no spouse or partner present, and 19.8% were households with a female householder and no spouse or partner present. About 27.2% of all households were made up of individuals and 12.3% had someone living alone who was 65 years of age or older.[13]
Of those housing units, 7.5% were vacant. Among occupied housing units, 77.3% were owner-occupied and 22.7% were renter-occupied. The homeowner vacancy rate was 0.8% and the rental vacancy rate was 6.1%.[13]
There were 6,211 households, out of which 33.30% had children under the age of 18 living with them, 59.00% weremarried couples living together, 7.60% had a female householder with no husband present, and 29.50% were non-families. 25.40% of all households were made up of individuals, and 13.10% 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 3.10.
In the county, the population was spread out, with 27.20% under the age of 18, 7.60% from 18 to 24, 27.20% from 25 to 44, 22.10% from 45 to 64, and 15.80% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 99.80 males. For every 100 females age 18 and over, there were 98.00 males.
Lafayette County has been a reliably Republican county at the federal level for most of its existence. Starting in 1992 however, it voted for the Democratic presidential nominees six elections in a row before shifting back to the GOP in 2016.