Population: 11,149 Growth: 15.6 percent Clackamas County / ˈ k l æ k ə m ə s / is a county in the U.S. state of Oregon.As of the 2010 United States Census, the population was 375,992, making it Oregon's third-most populous county. The population count of Clackamas County, OR was 405,788 in 2018. The ACS adheres to definitions of race and ethnicity set forth by the 1997 Office of Management and Budget (OMB) standards. Population Data for Clackamas, OR . Its county seat is Oregon City. Established: July 5, 1843. This chart shows the proportion of each racial group as a percentage of the total population. Multnomah County was the most populated county with 809,072 residents, followed by Washington County with 596,904 residents, and Clackamas County with 415,416 residents.Wheeler County with a population of 1,351 was the least populated county in Oregon in 2018. Close to Portland, a world away Clackamas County is located in the heart of the Metro region. Visitors and residents, alike, can jump on public transit to visit the big city, drive to Mt. Total Population: 381,697 [Most Recent City Population] Population Density: 204 [The number of residents per square mile of area.Population Change: 12.72% [The percent change in the citys population since 2000.Negative percentages represent a decrease in population. Population. Between 2017 and 2018 the population of Clackamas County, OR grew from 412,672 to 416,075, a 0.825% increase and its median household income grew from $79,878 to $81,278, a 1.75% increase. QuickFacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more. According to the US Census Bureau population estimates, there were 4,181,886 people living in Oregon in 2018. This small Clackamas County community just outside of the Portland urban growth area has long grown faster than the county as a whole. Population (2018): 419,425. How is Clackamas County's population distributed by race? The population count of Ada County, ID was 446,052 in 2018. In 2018, Clackamas County, OR had a population of 416k people with a median age of 41.4 and a median household income of $81,278. QuickFacts Clackamas County, Oregon; United States. The population count of Clackamas County, OR was 405,788 in 2018. Population Change. Hood, and visit an equestrian farm or raft the river all in one day. The county's location is just outside the hustle and bustle of the urbanized areas of the region, with all the same amenities. Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API - Notes: 1. ... "County QuickFacts" (population and economic data from U.S. Census Bureau) County Seat Map ... Clackamas County was named for the resident Clackamas Tribe and was one of the four original Oregon counties created in 1843. Name Status County Population Census 2000-04-01 Population Census 2010-04-01 Population Estimate 2019-07-01 ; Barlow: City: Clackamas: 127: 135: 147 → Canby: City: Clackamas