Editing Grass Valley, California (section)

===2010===
The [[2010 United States Census]]<ref>{{cite web|url=http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0630798|archive-url=https://archive.today/20140715035412/http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0630798|url-status=dead|archive-date=July 15, 2014|title=2010 Census Interactive Population Search: CA - Grass Valley city|publisher=U.S. Census Bureau|access-date=July 12, 2014}}</ref> reported that Grass Valley had a population of 12,860. The population density was {{convert|2,711.3|PD/sqmi|PD/km2|sp=us|adj=off}}. The [[Race and ethnicity in the United States Census|racial makeup]] of Grass Valley was 11,493 (89.4%) White, 208 (1.6%) Native American, 188 (1.5%) Asian, 46 (0.4%) African American, 9 (0.1%) Pacific Islander, 419 (3.3%) from other races, and 497 (3.9%) from two or more races. Hispanics or Latinos of any race were 1,341 persons (10.4%).

The census reported that 12,401 people (96.4% of the population) lived in households, 118 (0.9%) lived in noninstitutionalized group quarters, and 341 (2.7%) were institutionalized.

Of the 6,077 households, 1,544 (25.4%) had children under the age of 18 living in them, 1,665 (27.4%) were [[marriage|opposite-sex married couples]] living together, 980 (16.1%) had a female householder with no husband present, and 316 (5.2%) had a male householder with no wife present, 466 (7.7%) were [[POSSLQ|unmarried opposite-sex partnerships]], and 33 (0.5%) were [[Domestic partnership|same-sex married couples or partnerships]]. About 2,605 households (42.9%) were made up of individuals, and 1,415 (23.3%) had someone living alone who was 65 years of age or older. The average household size was 2.04. The 2,961 [[Family (US Census)|families]] (48.7% of all households) had an average family size of 2.78.

The population was distributed as 2,625 people (20.4%) under the age of 18, 1,146 people (8.9%) aged 18 to 24, 2,882 people (22.4%) aged 25 to 44, 3,183 people (24.8%) aged 45 to 64, and 3,024 people (23.5%) who were 65 years of age or older. The median age was 43.2 years. For every 100 females, there were 78.9 males.  For every 100 females age 18 and over, there were 73.5 males.

The 6,637 housing units averaged 1,399.3 per square mile (540.3/km{{sup|2}}), of which 2,391 (39.3%) were owner-occupied, and 3,686 (60.7%) were occupied by renters. The homeowner vacancy rate was 4.0%; the rental vacancy rate was 6.7%; 4,663 people (36.3% of the population) lived in owner-occupied housing units and 7,738 people (60.2%) lived in rental housing units.