2020 census As of the
2020 census, Grover Beach had a population of 12,701. The population density was . The median age was 41.5 years. 18.8% of residents were under the age of 18, and 18.1% were 65 years of age or older. For every 100 females, there were 95.1 males, and for every 100 females age 18 and over, there were 91.5 males age 18 and over. The census reported that 99.1% of the population lived in households, 115 people (0.9%) lived in non-institutionalized group quarters, and no one was institutionalized. 100.0% of residents lived in urban areas, while 0.0% lived in rural areas. There were 5,197 households, of which 26.7% had children under the age of 18 living in them. Of all households, 43.3% were married-couple households, 8.4% were
cohabiting couple households, 19.2% were households with a male householder and no spouse or partner present, and 29.2% were households with a female householder and no spouse or partner present. About 27.4% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older. The average household size was 2.42. There were 3,253
families (62.6% of all households). There were 5,856 housing units at an average density of , of which 11.3% were vacant. A total of 5,197 units (88.7%) were occupied; of these, 50.3% were owner-occupied and 49.7% were occupied by renters. The homeowner vacancy rate was 1.2%, and the rental vacancy rate was 3.4%. The median household income in 2023 was $82,534, and the
per capita income was $41,607. About 10.4% of families and 12.7% of the population were below the poverty line.
2010 census At the
2010 census, Grover Beach had a population of 13,156. The population density was . The racial makeup of Grover Beach was 9,964 (75.7%) White, 146 (1.1%) African American, 186 (1.4%) Native American, 542 (4.1%) Asian, 35 (0.3%) Pacific Islander, 1,582 (12.0%) from
other races, and 701 (5.3%) from two or more races. Hispanic or Latino of any race were 3,840 persons (29.2%). The census reported that 12,967 people (98.6% of the population) lived in households, 185 (1.4%) lived in non-institutionalized group quarters, and 4 (0.0%) were institutionalized. There were 5,111 households, 1,656 (32.4%) had children under the age of 18 living in them, 2,178 (42.6%) were
opposite-sex married couples living together, 735 (14.4%) had a female householder with no husband present, 335 (6.6%) had a male householder with no wife present. There were 428 (8.4%)
unmarried opposite-sex partnerships, and 54 (1.1%)
same-sex married couples or partnerships. 1,330 households (26.0%) were one person and 439 (8.6%) had someone living alone who was 65 or older. The average household size was 2.54. There were 3,248 families (63.5% of households); the average family size was 3.04. The age distribution was 2,928 people (22.3%) under the age of 18, 1,264 people (9.6%) aged 18 to 24, 3,809 people (29.0%) aged 25 to 44, 3,603 people (27.4%) aged 45 to 64, and 1,552 people (11.8%) who were 65 or older. The median age was 36.9 years. For every 100 females, there were 95.7 males. For every 100 females aged 18 and over, there were 93.6 males. There were 5,748 housing units at an average density of 2,483.5 per square mile, of the occupied units 2,390 (46.8%) were owner-occupied and 2,721 (53.2%) were rented. The homeowner vacancy rate was 2.0%; the rental vacancy rate was 3.7%. 5,719 people (43.5% of the population) lived in owner-occupied housing units and 7,248 people (55.1%) lived in rental housing units. ==Government==