The line graph illustrates population changes in three counties: Columbia, Yamhill, and Washington—in the U.S. state of Oregon from 1940 to 2000.
Overall, the populations of all three counties increased over this period. Washington had the highest population throughout, while Columbia and Yamhill followed a similar trend with more modest growth.
In 1940, Columbia’s population started at 30,000. This figure rose steadily to approximately 45,000 in 1970 and doubled to reach 90,000 by 2000. Similarly, Yamhill’s population grew gradually, beginning at just under 30,000 in 1940, slightly surpassing 30,000 in 1970, and reaching 75,000 by the end of the period.
Washington, on the other hand, saw a more dramatic increase. Starting with 75,000 in 1940, its population rose significantly to 125,000 by 1970. By 2000, Washington’s population had surged to around 245,000, far outpacing the growth in the other two counties.
