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2010 Census

Reservations in Dakotas, Washington selected for census test

Two Native American reservations — one in the Dakotas and another in Washington state — have been selected as test sites ahead of the 2020 census, as officials mull whether to ask for the first time about tribal enrollment.

Standing Rock Indian Reservation, which straddles North Dakota and South Dakota, and Colville Reservation in Washington will be the focus of next year's testing on tribal lands, the U.S. Census Bureau announced this month. The bureau has enlisted the help of the tribes on those reservations as it pilots efforts to avoid a 5 percent undercount of the population seen in the 2010 census.

"By selecting these geographic areas, we are...