View source for Yamhill County, Oregon

===2010 census===
As of the [[2010 United States census|2010 census]], there were 99,193 people, 34,726 households, and 25,020 families living in the county.<ref name="census-dp1">{{Cite web |title=DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data |url=http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_DP/DPDP1/0500000US41071 |url-status=dead |archive-url=https://archive.today/20200213011151/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_DP/DPDP1/0500000US41071 |archive-date=February 13, 2020 |access-date=February 23, 2016 |publisher=[[United States Census Bureau]]}}</ref> The population density was {{convert|138.6|PD/sqmi}}. There were 37,110 housing units at an average density of {{convert|51.8|/mi2|/km2|disp=preunit|units&nbsp;|units|}}.<ref name="census-density">{{Cite web |title=Population, Housing Units, Area, and Density: 2010 - County |url=http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/GCTPH1.CY07/0500000US41071 |url-status=dead |archive-url=https://archive.today/20200213185404/http://factfinder.census.gov/bkmk/table/1.0/en/DEC/10_SF1/GCTPH1.CY07/0500000US41071 |archive-date=February 13, 2020 |access-date=February 23, 2016 |publisher=[[United States Census Bureau]]}}</ref> The racial makeup of the county was 85.4% white, 1.5% Asian, 1.5% American Indian, 0.9% black or African American, 0.2% Pacific islander, 7.2% from other races, and 3.3% from two or more races. Those of Hispanic or Latino origin made up 14.7% of the population.<ref name="census-dp1" /> In terms of ancestry, 23.6% were [[German American|German]], 13.7% were [[English American|English]], 12.2% were [[Irish American|Irish]], and 5.0% were [[Americans|American]].<ref name="census-dp2">{{Cite web |title=DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates |url=http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP02/0500000US41071 |url-status=dead |archive-url=https://archive.today/20200213011105/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP02/0500000US41071 |archive-date=February 13, 2020 |access-date=February 23, 2016 |publisher=[[United States Census Bureau]]}}</ref>

Of the 34,726 households, 35.8% had children under the age of 18 living with them, 56.0% were married couples living together, 11.1% had a female householder with no husband present, 28.0% were non-families, and 21.7% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.12. The median age was 36.8 years.<ref name="census-dp1" />

The median income for a household in the county was $52,485 and the median income for a family was $61,524. Males had a median income of $44,946 versus $33,717 for females. The per capita income for the county was $24,017. About 9.0% of families and 12.7% of the population were below the [[poverty line]], including 16.8% of those under age 18 and 7.7% of those age 65 or over.<ref name="census-dp3">{{Cite web |title=DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates |url=http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP03/0500000US41071 |url-status=dead |archive-url=https://archive.today/20200213021512/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP03/0500000US41071 |archive-date=February 13, 2020 |access-date=February 23, 2016 |publisher=[[United States Census Bureau]]}}</ref>