The community derives its name from the initials of David A. Pennicuick, a railroad official.
As a designated place in the 2016 Census of Population conducted by Statistics Canada, Dapp recorded a population of 10 living in 4 of its 5 total private dwellings, a change of −70.6% from its 2011 population of 34. With a land area of 0.2 km2 (0.077 sq mi), it had a population density of 50.0/km2 (129.5/sq mi) in 2016.
As a designated place in the 2011 Census, Dapp had a population of 34 living in 14 of its 14 total dwellings, a 30.8% change from its 2006 population of 26. With a land area of 0.28 km2 (0.11 sq mi), it had a population density of 121/km2 (314/sq mi) in 2011.
- Alberta Municipal Affairs (2010-04-01). "Specialized and Rural Municipalities and Their Communities" (PDF). Retrieved 2010-07-08.
- Place-names of Alberta. Ottawa: Geographic Board of Canada. 1928. p. 41.
- "Population and dwelling counts, for Canada, provinces and territories, and designated places, 2016 and 2011 censuses – 100% data (Alberta)". Statistics Canada. February 8, 2017. Retrieved February 13, 2017.
- "Population and dwelling counts, for Canada, provinces and territories, and designated places, 2011 and 2006 censuses (Alberta)". Statistics Canada. 2012-02-08. Retrieved 2012-04-07.
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