A Population Summary for Kilglass Civil Parish County Roscommon   "Terry McCormick has put together a tabulated listing of the population for all the townlands in the Civil Parish of Kilglass in County Roscommon between 1749 and 1881"

• Statistics on the population of the British Isles (archived copy).
• Histpop, the online historical population reports website, in its census section provides access to all the published population reports for Britain and Ireland from 1801 - 1937. The site has a huge amount of statistical information both at a county level and at a parish or district level. There is no personal information on the site.
• Comparative Account of the Population of Great Britain in the years 1801, 1811, 1821, and 1831. House of Commons (19 October 1831) 432pp. (Provides parish-level population counts, for England, Wales and Scotland.)