Shell Ridge, California
Shell Ridge is a census-designated place in Contra Costa County, California, United States. Shell Ridge sits at an elevation of . The 2010 United States census reported Shell Ridge's population was 959. Geography. According to the United States Census Bureau, the CDP has a total area of , all of it land. Demographics. At the 2010 census Shell Ridge had a population of 959. The population density was 2,230.6 people per square mile (861.2/km). The racial makeup of Shell Ridge was 821 (85.6%) White, 5 (0.5%) African American, 2 (0.2%) Native American, 73 (7.6%) Asian, 6  (0.6%) Pacific Islander, 8 (0.8%) from other races, and 44 (4.6%) from two or more races. Hispanic or Latino of any race were 59 people (6.2%). The census reported that 100% of the population lived in households. There were 357 households, 128 (35.9%) had children under the age of 18 living in them, 263 (73.7%) were opposite-sex married couples living together, 20 (5.6%) had a female householder with no husband present, 13 (3.6%) had a male householder with no wife present. There were 7 (2.0%) unmarried opposite-sex partnerships, and 4 (1.1%) same-sex married couples or partnerships. 52  households (14.6%) were one person and 32 (9.0%) had someone living alone who was 65 or older. The average household size was 2.69. There were 296 families (82.9% of households); the average family size was 2.96. The age distribution was 229 people (23.9%) under the age of 18, 46 people (4.8%) aged 18 to 24, 157 people (16.4%) aged 25 to 44, 353 people (36.8%) aged 45 to 64, and 174 people (18.1%) who were 65 or older. The median age was 48.3 years. For every 100 females, there were 106.2 males. For every 100 females age 18 and over , there were 100.0 males. There were 370 housing units at an average density of 860.6 per square mile (332.3/km),of which 357 were occupied, 334 (93.6%) by the owners and 23 (6.4%) by renters. The homeowner vacancy rate was 0%; the rental vacancy rate was 11.1%. 887 people (92.5% of the population) lived in owner-occupied housing units and 72 people (7.5%) lived in rental housing units.