Major highways

• Interstate 79
• U.S. Highway 19
• U.S. Highway 48
• U.S. Highway 33/119
• West Virginia Route 4

Adjacent counties

• Harrison County (north)
• Upshur County (east)
• Webster County (south)
• Braxton County (southwest)
• Gilmer County (west)
• Doddridge County (northwest)

2020 census

As of the 2020 census, there were 17,033 people and 6,662 households residing in the county. There were 8,204 housing units in Lewis County. The racial makeup of the city was 94.5% White, 0.4% African American, 0.3% Asian, 0.1% Native American, 0.3% from other races, and 3.9% from two or more races. Hispanics or Latinos of any race were 1.1% of the population.

There were 26,143 households, of which 48.6% were married couples living together, 24.7% had a female householder with no spouse present, 20.8% had a male householder with no spouse present. The average household and family size was 3.13. The median age in the city was 43.6 years with 21.2% of the population was under 18. The median income for a household in the city was $45,345 and the poverty rate was 17.2%.^[12]

2010 census

As of the 2010 United States census, there were 16,372 people, 6,863 households, and 4,570 families living in the county.^[13] The population density was 42.5 inhabitants per square mile (16.4/km²). There were 7,958 housing units at an average density of 20.7 units per square mile (8.0 units/km²).^[14] The racial makeup of the county was 97.9% white, 0.5% black or African American, 0.3% Asian, 0.2% American Indian, 0.1% from other races, and 1.0% from two or more races. Those of Hispanic or Latino origin made up 0.6% of the population.^[13] In terms of ancestry, 17.5% were American, 15.0% were German, 9.9% were Irish, and 7.2% were English.^[15]

Of the 6,863 households, 28.1% had children under the age of 18 living with them, 50.9% were married couples living together, 10.9% had a female householder with no husband present, 33.4% were non-families, and 28.5% of all households were made up of individuals. The average household size was 2.35 and the average family size was 2.84. The median age was 43.4 years.^[13]

The median income for a household in the county was $33,293 and the median income for a family was $42,281. Males had a median income of $31,950 versus $25,945 for females. The per capita income for the county was $18,240. About 13.6% of families and 19.6% of the population were below the poverty line, including 25.3% of those under age 18 and 12.9% of those age 65 or over.^[16]

2000 census

As of the census of 2000, there were 16,919 people, 6,946 households, and 4,806 families living in the county. The population density was 44 people per square mile (17 people/km²). There were 7,944 housing units at an average density of 21 units per square mile (8.1 units/km²). The racial makeup of the county was 98.59% White, 0.13% Black or African American, 0.20% Native American, 0.29% Asian, 0.08% from other races, and 0.70% from two or more races. 0.50% of the population were Hispanic or Latino of any race.

There were 6,946 households, out of which 28.60% had children under the age of 18 living with them, 54.60% were married couples living together, 10.50% had a female householder with no husband present, and 30.80% were non-families. 26.90% of all households were made up of individuals, and 13.00% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.88.

In the county, the population was spread out, with 22.10% under the age of 18, 7.70% from 18 to 24, 28.00% from 25 to 44, 25.90% from 45 to 64, and 16.40% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 94.20 males. For every 100 females age 18 and over, there were 91.40 males.

The median income for a household in the county was $27,066, and the median income for a family was $32,431. Males had a median income of $27,906 versus $18,733 for females. The per capita income for the county was $13,933. 19.90% of the population and 16.30% of families were below the poverty line. 27.00% of those under the age of 18 and 11.20% of those 65 and older were living below the poverty line.

City

• Weston (county seat)

Town

• Jane Lew

Magisterial districts

• Courthouse-Collins Settlement
• Freemans Creek
• Hackers Creek-Skin Creek

Unincorporated communities