Old Fields is an unincorporated community on the South Branch Potomac River in northern Hardy County, West Virginia, United States. According to the Geographic Names Information System, Old Fields has also been known throughout its history as Indian Old Field, Indian Old Fields, and Oldfields. Also, as "Fort Pleasant," a French and Indian War fort built …Old Fields is an unincorporated community on the South Branch Potomac River in northern Hardy County, West Virginia, United States. According to the Geographic Names Information System, Old Fields has also been known throughout its history as Indian Old Field, Indian Old Fields, and Oldfields. Also, as "Fort Pleasant," a French and Indian War fort built on the Van Meter land at Old Fields.