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City Building191 Main StreetNew Martinsville WV 26155 Hours Quick Links Brief History of New Martinsville New Martinsville West Virginia in Wetzel county United States is located 71 miles SW of Pittsburgh Pennsylvania along the Ohio River. The population was 5162 at the 2020 census. It is the county seat of Wetzel County. In 1810 Sarah Dunlin sold the family farm in six sections to Andrew Beall 400 acres Joseph and John Witten 400 acres Robert McEldowny 300 acres Samuel McEldowny 100 acres William Springer 100 acres and Presley Martin 100 acres.