Dunmore is a borough in Lackawanna County, Pennsylvania, United States, adjoining Scranton. It is part of Northeastern Pennsylvania and was settled in 1835 and incorporated in 1862. Extensive anthracite coal, brick, stone, and silk interests had led to a rapid increase in the population from 8,315 in 1890 to 23,086 in 1940. The population was 14,042 in the 2020 census.