Population Growth

Fueled by job growth and attractive quality of life, the population of Sonoma County has steadily increased over the last 10 years. Between 2000 and 2010, the population increased by 34,671 people, or 7.6 percent. Today there are 493,285 Sonoma County residents. The majority of new residents, 69 percent, live within the boundaries of Sonoma County’s nine cities. The City of Santa Rosa has led this growth in total population, adding 15,841 residents, or 10.7 percent, over ten years to attain its current population of 163,436 people.

Between 1990 and 2000, Sonoma County’s population increased by 70,392 persons, with an average annual growth rate of 1.9 percent. From 2000 to 2010, population in Sonoma County at an average annual rate of 0.7 percent. In 2015 the population is projected to be 519,042 residents. (Source: California Department of Finance (DOF) and the the US Census).

Population Growth


Race/Ethnicity% of Total (2011)
American Indian2.2%

Age Groups

Age Groups% of Total 2011Projected % of Total 2015
0-9 yrs.11.9%14.0%
10-19 yrs.13.5%13.5%
20-34 yrs.18.9%21.6%
35-44 yrs.13.3%10.2%
45-54 yrs15.6%12.1%
55-59 yrs.7.3%6.9%
60-74 yrs.12.8%16.3%
75+ yrs.6.7%5.5%

Education Completed % of Total 2011 (25+ years)

Less than 9th grade7.8%
9th-12th grade, no diploma6.6%
High school diploma/GED21.0%
Some college, no degree25.2%
Associates degree8.5%
Bachelor’s degree20.4%
Graduate or professional degree11.1%

Census 2011

The percent of Sonoma County residents over the age of 25 with college degrees has risen over the past five years. According to the US Census, more than 31 percent of Sonoma County residents over the age of 25 possessed a bachelor’s degree or higher education in 2011, compared to the state average of 29 percent.
Laughing child - Population Growth

Other Sources for Population Information