Collierville is a census-designated place in San Joaquin County, California. Collierville sits at an elevation of 62 feet (19 m). The 2020 United States census reported Collierville's population was 2,698.

According to the United States Census Bureau, the CDP covers an area of 6.6 square miles (17.1 km), 99.85% of it land, and 0.15% of it water.

Historical population

Census	Pop.	Note	%±
2020	2,698		—
U.S. Decennial Census 1850–1870 1880-1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

The 2010 United States Census reported that Collierville had a population of 1,934. The population density was 292.8 inhabitants per square mile (113.1/km). The racial makeup of Collierville was 1,552 (80.2%) White, 14 (0.7%) African American, 21 (1.1%) Native American, 49 (2.5%) Asian, 1 (0.1%) Pacific Islander, 229 (11.8%) from other races, and 68 (3.5%) from two or more races. Hispanic or Latino of any race were 518 persons (26.8%).

The Census reported that 1,912 people (98.9% of the population) lived in households, 22 (1.1%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.

There were 667 households, out of which 239 (35.8%) had children under the age of 18 living in them, 420 (63.0%) were opposite-sex married couples living together, 57 (8.5%) had a female householder with no husband present, 48 (7.2%) had a male householder with no wife present. There were 36 (5.4%) unmarried opposite-sex partnerships, and 8 (1.2%) same-sex married couples or partnerships. 113 households (16.9%) were made up of individuals, and 59 (8.8%) had someone living alone who was 65 years of age or older. The average household size was 2.87. There were 525 families (78.7% of all households); the average family size was 3.18.

The population was spread out, with 459 people (23.7%) under the age of 18, 157 people (8.1%) aged 18 to 24, 395 people (20.4%) aged 25 to 44, 602 people (31.1%) aged 45 to 64, and 321 people (16.6%) who were 65 years of age or older. The median age was 43.3 years. For every 100 females, there were 100.0 males. For every 100 females age 18 and over, there were 97.5 males.

There were 714 housing units at an average density of 108.1 per square mile (41.7/km), of which 519 (77.8%) were owner-occupied, and 148 (22.2%) were occupied by renters. The homeowner vacancy rate was 3.0%; the rental vacancy rate was 5.1%. 1,440 people (74.5% of the population) lived in owner-occupied housing units and 472 people (24.4%) lived in rental housing units.

According to the Köppen Climate Classification system, Collierville has a warm-summer Mediterranean climate, abbreviated "Csa" on climate maps.