2020 census As of the
2020 census, Marina had a population of 22,359. The population density was . The median age was 35.6 years, with 23.7% of residents under age 18, 10.8% aged 18 to 24, 27.1% aged 25 to 44, 23.8% aged 45 to 64, and 14.6% aged 65 or older. For every 100 females there were 90.4 males, and for every 100 females age 18 and over there were 88.4 males. There were 7,608 households, of which 33.6% had children under the age of 18 living in them. Of all households, 44.2% were married-couple households, 8.4% were
cohabiting-couple households, 17.8% had a male householder with no spouse or partner present, and 29.6% had a female householder with no spouse or partner present. About 23.6% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.72. There were 5,108
families (67.1% of all households). There were 8,022 housing units at an average density of , of which 7,608 (94.8%) were occupied. Of the occupied units, 43.8% were owner-occupied and 56.2% were occupied by renters. The homeowner vacancy rate was 0.4% and the rental vacancy rate was 3.7%. The median household income in 2023 was $88,518, and the
per capita income was $39,382. About 10.5% of families and 14.6% of the population were below the poverty line.
2010 census At the
2010 census Marina had a population of 19,718. The population density was . The racial makeup of Marina was 8,904 (45.1%) White, 1,487 (7.5%) African American, 140 (0.7%) Native American, 2,931 (9.9%) Asian, 544 (2.8%) Pacific Islander, 2,738 (13.9%) from
other races, and 1,974 (10.0%) from two or more races. Hispanic or Latino of any race were 5,372 persons (27.2%). The census reported that 18,827 people (95.5% of the population) lived in households, 891 (4.5%) lived in non-institutionalized group quarters, and no one was institutionalized. There were 6,845 households, 2,517 (36.8%) had children under the age of 18 living in them, 3,126 (45.7%) were
opposite-sex married couples living together, 1,128 (16.5%) had a female householder with no husband present, 417 (6.1%) had a male householder with no wife present. There were 517 (7.6%)
unmarried opposite-sex partnerships. 1,587 households (23.2%) were one person and 553 (8.1%) had someone living alone who was 65 or older. The average household size was 2.75. There were 4,671 families (68.2% of households); the average family size was 3.26. The age distribution was 4,773 people (24.2%) under the age of 18, 2,543 people (12.9%) aged 18 to 24, 5,188 people (26.3%) aged 25 to 44, 4,970 people (25.2%) aged 45 to 64, and 2,244 people (11.4%) who were 65 or older. The median age was 34.0 years. For every 100 females, there were 92.8 males. For every 100 females age 18 and over, there were 88.5 males. There were 7,200 housing units at an average density of 737.5 per square mile, of the occupied units 2,963 (43.3%) were owner-occupied and 3,882 (56.7%) were rented. The homeowner vacancy rate was 2.4%; the rental vacancy rate was 3.6%. 7,857 people (39.8% of the population) lived in owner-occupied housing units and 10,970 people (55.6%) lived in rental housing units. The military has been a significant part of life in Marina, which is located adjacent to the former
Fort Ord, a US Army installation which closed in 1994 during the country's base closure initiative. Many former and retired military personnel reside in the city. The American Legion and the Veterans of Foreign Wars are active organizations. The
Veterans Transition Center is instrumental in placing numerous US and state flags along Del Monte Blvd. and Reservation Road during the various holidays and special events, creating an "avenue of flags." ==Parks and recreation==