The Incan Empire conducted perhaps the most unique census of the 15th century. The Incas, whose empire stretched across the Andes mountains, above, recorded information on quipus. A quipu is a rope made from llama or alpaca hair or cotton cords. A series of knots on the quipu defined certain numeric and non-numeric values. Quipus recorded the ages, occupations, and wealth of Incan citizens.

Photograph by Rudy King, MyShot
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census
census Encyclopedic Entry

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9-12+

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Mathematics, Geography, Social Studies

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Encyclopedic entry. A census counts the population of a nation, state, or other geographic region. It records information about the population’s characteristics, such as age, sex, and occupation.