Santa Rosa is the county seat of Sonoma County, California. As of July 1, 2005, the population was approximately 156,200 residents. Santa Rosa is the largest city in California's Wine Country and fifth largest in the San Francisco Bay Area.
Santa Rosa is located at 38°26'55" North, 122°42'17" West (38.448611, -122.704646).
According to the United States Census Bureau, the city has a total area of 104.6 km2 (40.4 mi2). 103.9 km2 (40.1 mi2) of it is land and 0.6 km2 (0.2 mi2) of it is water. The total area is 0.62% water.
Santa Rosa lies along the U.S. Highway 101 corridor approximately 50 miles north of San Francisco via the Golden Gate Bridge. The city lies on the Santa Rosa Plain; its eastern extremities stretch into The Valley of the Moon (Sonoma Valley), while its western edge abuts the largely-rural rolling hills of western Sonoma County. To the north and to the south, a relatively developed corridor along Highway 101 leads to neighboring towns of Windsor and Rohnert Park, respectively.
The population of Santa Rosa was estimated by the U.S. Census Bureau to be 153,386 residents as of July 1, 2003. That was an increase of 0.5 % from a year earlier and an increase of 3.7 % from the 2000 Census. That is a rate of increase that, if continued, would double the population in 59 years.
According to the 2000 Census, Santa Rosa's population was 147,595 residents, a 30.3 % increase from the 113,313 residents in 1990. During the previous decade, the population increased by 37.1 % from 82,658 residents in 1980.
Per the 2000 Census, the population density is 1,420.1/km2 (3,678.3/mi2). There are 57,578 housing units at an average density of 554.0/km2 (1,434.9/mi2). The racial makeup of the city is 77.60% White, 2.15% African American, 1.42% Native American, 3.84% Asian, 0.26% Pacific Islander, 10.28% from other races, and 4.44% from two or more races. 19.19% of the population are Hispanic or Latino of any race.
There are 56,036 households out of which 30.9% have children under the age of 18 living with them, 46.9% are married couples living together, 11.0% have a female householder with no husband present, and 37.3% are non-families. 27.8% of all households are made up of individuals and 11.9% have someone living alone who is 65 years of age or older. The average household size is 2.57 and the average family size is 3.14.
In the city, the population is spread out with 24.3% under the age of 18, 9.5% from 18 to 24, 30.0% from 25 to 44, 22.3% from 45 to 64, and 13.9% who are 65 years of age or older. The median age is 36 years. For every 100 females there are 95.4 males. For every 100 females age 18 and over, there are 91.8 males.
The median income for a household in the city is $50,931, and the median income for a family is $59,659. Males have a median income of $40,420 versus $30,597 for females. The per capita income for the city is $24,495. 8.5% of the population and 5.1% of families are below the poverty line. Out of the total population, 9.5% of those under the age of 18 and 4.7% of those 65 and older are living below the poverty line.