New Martinsville is a city in Wetzel County, West Virginia, United States, along the Ohio River. The population was 5,366 at the 2010 census. It is the county seat of Wetzel County.
New Martinsville is located at 39°39′27″N 80°51′34″W (39.657465, -80.859504). Big Fishing Creek/ Fishing Creek is located downstream nearby, just South of town.
According to the United States Census Bureau, the city has a total area of 2.71 square miles (7.02 km2), of which, 2.67 square miles (6.92 km2) is land and 0.04 square miles (0.10 km2) is water.
The town was named after Presley Martin, an early settler.
As of the census of 2010, there were 5,366 people, 2,340 households, and 1,477 families living in the city. The population density was 2,009.7 inhabitants per square mile (775.9/km2). There were 2,632 housing units at an average density of 985.8 per square mile (380.6/km2). The racial makeup of the city was 98.2% White, 0.2% African American, 0.1% Native American, 0.6% Asian, 0.3% from other races, and 0.6% from two or more races. Hispanic or Latino of any race were 0.6% of the population.
There were 2,340 households, of which 25.7% had children under the age of 18 living with them, 46.8% were married couples living together, 12.1% had a female householder with no husband present, 4.2% had a male householder with no wife present, and 36.9% were non-families. 32.2% of all households were made up of individuals, and 15.1% had someone living alone who was 65 years of age or older.