2020 census As of the
2020 census, Oceano had a population of 7,183 and a population density of . 99.6% of residents lived in urban areas, while 0.4% lived in rural areas. The age distribution was 20.9% under the age of 18, 8.3% aged 18 to 24, 26.8% aged 25 to 44, 26.0% aged 45 to 64, and 18.1% who were 65 years of age or older. The median age was 40.5 years. For every 100 females there were 97.0 males, and for every 100 females age 18 and over there were 94.4 males age 18 and over. There were 3,177 housing units at an average density of , of which 2,653 (83.5%) were occupied. Of occupied units, 54.6% were owner-occupied and 45.4% were occupied by renters. 16.5% of housing units were vacant. The homeowner vacancy rate was 1.9% and the rental vacancy rate was 4.1%.
Income and poverty The median household income in 2023 was $69,448, and the
per capita income was $38,764. About 12.0% of families and 17.1% of the population were below the poverty line.
2010 census At the
2010 census Oceano had a population of 7,286. The population density was . The ethnic makeup of Oceano was 5,105 (70.1%) White, 62 (0.9%) African American, 120 (1.6%) Native American, 165 (2.3%) Asian, 7 (0.1%) Pacific Islander, 1,509 (20.7%) from
other races, and 318 (4.4%) from two or more races. Hispanic or Latino of any race were 3,484 persons (47.8%). The whole population lived in households, no one lived in non-institutionalized group quarters and no one was institutionalized. There were 2,603 households, 904 (34.7%) had children under the age of 18 living in them, 1,147 (44.1%) were
opposite-sex married couples living together, 360 (13.8%) had a female householder with no husband present, 197 (7.6%) had a male householder with no wife present. There were 197 (7.6%)
unmarried opposite-sex partnerships, and 38 (1.5%)
same-sex married couples or partnerships. 680 households (26.1%) were one person and 266 (10.2%) had someone living alone who was 65 or older. The average household size was 2.80. There were 1,704 families (65.5% of households); the average family size was 3.39. The population was spread out, with 1,738 people (23.9%) under the age of 18, 747 people (10.3%) aged 18 to 24, 2,028 people (27.8%) aged 25 to 44, 1,870 people (25.7%) aged 45 to 64, and 903 people (12.4%) who were 65 or older. The median age was 35.4 years. For every 100 females, there were 101.9 males. For every 100 females age 18 and over, there were 100.7 males. There were 3,117 housing units at an average density of 2,015.1 per square mile, of the occupied units 1,355 (52.1%) were owner-occupied and 1,248 (47.9%) were rented. The homeowner vacancy rate was 3.7%; the rental vacancy rate was 5.9%. 3,444 people (47.3% of the population) lived in owner-occupied housing units and 3,842 people (52.7%) lived in rental housing units. ==History==