The graph below shows the population change between 1940 and 2000 in three different counties in the U.S. state of Oregon.

The line graph displays the

population

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shift between 1940 and 2000 in the counties of Columbia,

Yamhill

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, and Washington, which belong to the state of Oregon, USA.

Overall

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, there was a considerable

population

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increase in the county of Washington, and Columbia and

Yamhill

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both rose slightly. In 1940, Washington had a

population

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of 75 thousand people. After 30 years, there were around 121,000 citizens of

this

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county. During the period after 1970, the

population

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rose sharply until it became more than 240,000 in the year 2000. At the start of the period, exactly 30,000 people lived in

Yamhill

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; it was increasing moderately until it reached a

population

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of 45,000 in 1970. Its

population

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continued to grow and doubled by the end of the period. The

population

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of Columbia was almost 30,000 citizens in 1940, and it had a modest increase to just over 30,000 in 1970.

Similarly

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to

Yamhill

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, it showed a steady rise until it reached 75,000 citizens in the second millennium.