Flint is a town and community in Flintshire, Wales, lying on the estuary of the River Dee. It is the former county town of Flintshire. According to …Flint is a town and community in Flintshire, Wales, lying on the estuary of the River Dee. It is the former county town of Flintshire. According to the 2011 Census, the population of the community of Flint was 12,953, increasing to 13,732 at the 2021 census. The urban area including Holywell and Bagillt had a population of 26,442.