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

The line graph illustrates the changes in the number of residents in three

counties

(

Columbia

,

Yamhill

, and Washington) in the Oregon state in America over a 60-year

period

.

Overall

, Washington consistently had the largest

population

in the state of Oregon during the whole

period

, with all three

counties

showing varying degrees of upward trends. In detail, Washington County started with about 75,000 residents in 1940 and saw a steady increase to over 120,000 by 1970. From that point, its

population

rose at an even faster pace during the rest of the

period

, reaching over 240,000 in 2000, maintaining the lead in

population

size among the other

counties

.

Similarly

, both

Yamhill

and

Columbia

counties

experienced

population

growth, despite the slower growth rate. In 1940,

Yamhill

and

Columbia

both had nearly 30,000 residents. The

population

of

Yamhill

increased gradually to 45,000 by 1970,

while

Columbia

grew more modestly to just over 30,000. During the final three decades, both

counties

saw

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more accelerated growth, with

Yamhill

reaching 90,000 and

Columbia

reaching 75,000 by the end of the

period

in 2000.