Source note: This graph brings together archaeological research, historical records, census data, and modern tribal enrollment figures. Because reliable population counts do not exist for many periods, some figures are estimates and the values between known benchmarks are approximations. The shaded areas show where greater uncertainty exists. Early figures estimate the Lenape population within Lenapehoking, while modern figures reflect enrollment in six recognized Lenape nations, so the historical and modern numbers are not directly comparable.

Precontact and seventeenth-century population

Becker, Marshall Joseph. “Lenape Population at the Time of European Contact: Estimating Native Numbers in the Lower Delaware Valley.” Proceedings of the American Philosophical Society 133, no. 2 (1989): 112–122. JSTOR.

This is the most directly relevant scholarly population study. Becker uses archaeological and documentary evidence but defines the lower Delaware Valley narrowly, producing estimates considerably lower than many broad Lenapehoking estimates.

Goddard, Ives. “Delaware.” In Handbook of North American Indians, Volume 15: Northeast, edited by Bruce G. Trigger, 213–239. Washington, DC: Smithsonian Institution, 1978.
A foundational scholarly overview of Lenape identity, territory, language, population movements and historical classification.

Grumet, Robert S. The Munsee Indians: A History. Norman: University of Oklahoma Press, 2009. Publisher information.
Important for Munsee populations in northern Lenapehoking and their movements through New York, Pennsylvania and neighboring regions.

Soderlund, Jean R. Lenape Country: Delaware Valley Society Before William Penn. Philadelphia: University of Pennsylvania Press, 2015. University of Pennsylvania Press.
Provides the historical context for Lenape settlement, trade, warfare and colonial disruption during the seventeenth century.

Weslager, C. A. The Delaware Indians: A History. New Brunswick, NJ: Rutgers University Press, 1972. Rutgers University Press.
A comprehensive history of Lenape displacement and migration. Older in interpretation but still valuable for tracing scattered communities through the eighteenth and nineteenth centuries.

“Native Peoples to 1680.” Encyclopedia of Greater Philadelphia. Online article.
This source provides the clearest published numerical anchors used in the graph:

• Approximately 7,500 in 1600

• Approximately 4,000 in the 1650s

• Approximately 3,000 by 1670

Disease and demographic collapse

Thornton, Russell. American Indian Holocaust and Survival: A Population History Since 1492. Norman: University of Oklahoma Press, 1987. University of Oklahoma Press.
Provides the broader demographic framework for understanding population loss through disease, warfare, removal, relocation and disruption. It does not supply every Lenape-specific number in the graph.

Patterson, K. David, and Gerald F. Pyle. “The Geography and Mortality of the 1918 Influenza Pandemic.” More relevantly, Patterson’s associated work on Native American smallpox examines the transmission and demographic consequences of introduced epidemics. American Journal of the Medical Sciences.

National Park Service. “The Lenape: Native Inhabitants of the St. Paul’s Area.” National Park Service.
Supports the conclusion that thousands of Lenape and other Eastern Native people died from introduced epidemics during the seventeenth and eighteenth centuries, although it does not provide a complete population series.

Eighteenth through early twentieth centuries

National Archives and Records Administration. “Indian Census Rolls, 1885–1940.” National Archives.
These rolls help document federally supervised Delaware populations, but NARA cautions that they did not necessarily include everyone and were not produced consistently for every community or every year.

United States Census Bureau. “Censuses of American Indians.” Census Bureau.
Provides access to early federal enumerations and the 1950 special reservation census. It also explains why historical Native counts are incomplete and methodologically inconsistent.

Oklahoma Historical Society. “Delaware, Western.” Encyclopedia of Oklahoma History and Culture. Oklahoma Historical Society.

Useful for the Western Delaware, now Delaware Nation. It records 1,298 members in 1999 and provides the historical context for migration and separate political development.

Late twentieth-century census methodology

United States Census Bureau. Characteristics of American Indians by Tribe and Language: 1990 Census of Population. Washington, DC: U.S. Government Printing Office, 1994. Census publication collection.
Provides self-reported tribal-identification data, which should not be confused with legal enrollment.

Sandefur, Gary D., Ronald R. Rindfuss, and Barney Cohen, eds. “The Growing American Indian Population, 1960–1990.” In Changing Numbers, Changing Needs: American Indian Demography and Public Health. Washington, DC: National Academies Press, 1996. National Academies.

Explains why recorded American Indian populations grew faster than births alone could explain. Changing self-identification, census procedures and improved reporting contributed substantially.

Current enrollment and registration

Delaware Tribe of Indians. “From the Desk of Chief Brad KillsCrow.” Delaware Indian News, April 2023.
The chief reports more than 12,000 enrolled members. Delaware Indian News PDF.

Delaware Nation. 2024 Annual Report. Anadarko, Oklahoma: Delaware Nation, 2024. Official report page.
Reports approximately 2,255 Delaware Nation citizens.

Great Lakes Inter-Tribal Council. “Stockbridge-Munsee Community.” Tribal profile.
Reports approximately 1,500 Stockbridge-Munsee citizens.

Indigenous Services Canada. “First Nations Registered Population: Munsee-Delaware Nation.” First Nation Profiles, August 2026. Official population profile.
Reports 764 registered members.

Eelūnaapèewii Lahkèewiit. “Delaware Nation.” Official community website.
Reports more than 1,000 members, approximately 550 of whom live in the community.

Indigenous Services Canada. “Six Nations of the Grand River.” First Nation Profiles. Official profile.
Canadian registration information identifies the Delaware community within Six Nations. Recent tabulations place it at approximately 747 registered people.