Major highways

Adjacent counties

The county includes parts of two national forests: Mount Hood National Forest and Willamette National Forest.

2010 census

As of the 2010 census, there were 375,992 people, 145,790 households, and 100,866 families in the county.^[10] The population density was 201.0 inhabitants per square mile (77.6/km²). There were 156,945 housing units at an average density of 83.9 per square mile (32.4/km²).^[11] The racial makeup of the county was 88.2% white, 3.7% Asian, 0.8% American Indian, 0.8% black or African American, 0.2% Pacific islander, 3.1% from other races, and 3.2% from two or more races. Those of Hispanic or Latino origin made up 7.7% of the population.^[10] In terms of ancestry, 24.9% were German, 14.5% were English, 13.3% were Irish, 5.0% were Norwegian, and 4.9% were American.^[12]

Of the 145,790 households, 32.8% had children under the age of 18 living with them, 54.8% were married couples living together, 9.8% had a female householder with no husband present, 30.8% were non-families, and 24.1% of all households were made up of individuals. The average household size was 2.56 and the average family size was 3.04. The median age was 40.6 years.^[10]

The median income for a household in the county was $62,007 and the median income for a family was $74,905. Males had a median income of $53,488 versus $39,796 for females. The per capita income for the county was $31,785. About 6.1% of families and 9.0% of the population were below the poverty line, including 11.2% of those under age 18 and 6.2% of those age 65 or over.^[13]

2000 census

As of the 2000 census, there were 338,391 people, 128,201 households, and 91,663 families in the county. The population density was 181 people per square mile (70 people/km²). There were 136,954 housing units at an average density of 73 units per square mile (28/km²). The racial makeup of the county was 91.27% White, 2.45% Asian, 0.71% Native American, 0.66% Black or African American, 0.17% Pacific Islander, 2.28% from other races, and 2.46% from two or more races. 4.95% of the population were Hispanic or Latino of any race. 20.7% were of German, 11.6% English, 9.1% Irish and 7.5% American ancestry.

There were 128,201 households, out of which 34.20% had children under the age of 18 living with them, 58.60% were married couples living together, 9.00% had a female householder with no husband present, and 28.50% were non-families. 22.00% of all households were made up of individuals, and 7.80% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.07.

The county population contained 26.20% under the age of 18, 8.00% from 18 to 24, 28.70% from 25 to 44, 26.00% from 45 to 64, and 11.10% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 97.50 males. For every 100 females age 18 and over, there were 94.90 males.

The median income for a household in the county was $52,080, and the median income for a family was $60,791. Males had a median income of $43,462 versus $30,891 for females. The per capita income for the county was $25,973. About 4.60% of families and 6.60% of the population were below the poverty line, including 7.60% of those under age 18 and 5.10% of those age 65 or over.

Cities

Census-designated places

Hamlet

• Molalla Prairie

Unincorporated communities

Former unincorporated communities

• Bissell – named for W. S. Bissell, U.S. Postmaster General from 1893 to 1895.^[14] Bissell had its own post office from at least 1899 to 1923.^[15][16]

Incorporated communities

Clackamas County is the first county in Oregon to have four models of governance for its communities. Like the rest of Oregon, it has cities (which are formally incorporated) and rural communities (some of which for federal purposes are considered census-designated places).

After the completion of a process that began in late 1999, the county adopted an ordinance on August 11, 2005, which defined hamlets and villages. By the November 30, 2005, deadline, three communities had submitted petitions to be designated as such. Boring petitioned to become a village, but the application was rejected in a town hall referendum in August 2006. The communities along U.S. Route 26 near Mount Hood from Brightwood to Rhododendron petitioned to become "The Villages at Mount Hood", and it was approved by residents in May 2006. Beavercreek petitioned to become a hamlet, and was recognized as such in September 2006.

While the other counties in the Portland Metropolitan Area are solidly Democratic, Clackamas County typically serves as a swing county. It has usually voted for the eventual winner of presidential elections, with exceptions in 1884, 1892, 1916, 1948, 1960, 1976, and 2016.

^[17]

State representatives

State senators