Matamoras is a village in Washington County, Ohio, United States, along the Ohio River. It is also commonly known as New Matamoras. The population was 896 at the 2010 census.Matamoras first settled in 1797 by James Riggs and his sons-in-law, Martin and Anthony Sheets along with their families. Riggs and his family cleared the land and built three cabins in the area. It was not known as Matamoras at that time.