The population was 519 at the 2000 census. Northfork was incorporated in 1901, so named because of its location on the north fork of the Elkhorn Creek at its junction with the south fork. It was consolidated with the town of Clark on March 26, 1948.
Northfork High School won a national high school record eight consecutive basketball championships in West Virginia AA competition from 1974-1981, ten championships overall. Northfork High School closed in 1985.
Northfork has a police department staffed by 3 officers including Chief Larry Robinson, Assistant Chief Jody Mitchell and Sergeant Richard "Dickie" Eldreth.
Northfork has several small businesses including: Family Dollar, Black Diamond Pharmacy, Ameribank, Tug River Health Clinic, Service Pro Heating and Cooling, Hurst Medical, Widener Funeral Home, Wideners Ambulance Service, C & V Exxon, and The Coffee Shop.
Currently the Mayor of Northfork Nick Mason owns and operates Nicks Place within the city. It is a family owned restaurant which is home of the famous "Liver Sandwich".
The town also has a museum which has a variety of coal mining items.
There were 229 households out of which 21.8% had children under the age of 18 living with them, 29.3% were married couples living together, 24.9% had a female householder with no husband present, and 42.8% were non-families. 38.9% of all households were made up of individuals and 20.1% had someone living alone who was 65 years of age or older. The average household size was 2.24 and the average family size was 3.03.
In the town the population was spread out with 22.5% under the age of 18, 8.1% from 18 to 24, 22.0% from 25 to 44, 23.3% from 45 to 64, and 24.1% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 79.0 males. For every 100 females age 18 and over, there were 69.6 males.
The median income for a household in the town was $16,544, and the median income for a family was $19,236. Males had a median income of $27,917 versus $20,781 for females. The per capita income for the town was $10,001. About 31.3% of families and 34.4% of the population were below the poverty line, including 52.6% of those under age 18 and 20.9% of those age 65 or over.