Oregon Citizen Population By County in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for Oregon was 3,853,530 and represented 94.40% of the total Oregon population.

Among all Oregon counties, Multnomah had the highest citizen population (740.04K), followed by Washington (525.22K), and Clackamas (391.91K).

In terms of percentages, Grant had the highest percentage of its population being citizens (99.51%), followed by Sherman (99.38%), and Wallowa (99.06%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

You can see similar information for other states and by state for the United States.

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Oregon Citizen Voting-age Population By County in 2018

Data Source: US Census - ACS 5-Year (CVAP).

See this for other years:

Oregon Citizen Population By County in 2018

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County	Citizen Population	% of County Population
Multnomah	740035	92.66
Washington	525220	90.27
Clackamas	391905	96.58
Lane	356025	96.52
Marion	307990	91.79
Jackson	206755	96.50
Deschutes	176375	97.64
Linn	119450	97.22
Douglas	106880	98.67
Yamhill	98480	94.86
Josephine	83450	97.63
Benton	83280	92.76
Polk	77335	94.98
Umatilla	70825	92.10
Klamath	64290	96.95
Coos	62140	98.15
Columbia	50150	98.62
Lincoln	46565	97.25
Clatsop	37355	96.88
Malheur	28200	92.67
Union	25325	97.29
Tillamook	25095	96.24
Wasco	24245	93.74
Curry	22265	98.93
Jefferson	22265	96.20
Crook	21900	98.05
Hood River	20445	88.39
Baker	15750	98.53
Morrow	9795	87.34
Lake	7740	98.66
Grant	7150	99.51
Harney	7150	98.89
Wallowa	6860	99.06
Gilliam	1870	98.16
Sherman	1595	99.38
Wheeler	1380	96.84