2020 census As of the
2020 census, Nipomo had a population of 18,176. The population density was . The median age was 39.5 years. 23.9% of residents were under the age of 18 and 17.7% of residents were 65 years of age or older. For every 100 females there were 97.0 males, and for every 100 females age 18 and over there were 95.5 males age 18 and over. 89.1% of residents lived in urban areas, while 10.9% lived in rural areas. There were 6,065 households in Nipomo, of which 34.9% had children under the age of 18 living in them. Of all households, 56.4% were married-couple households, 13.5% were households with a male householder and no spouse or partner present, and 23.5% were households with a female householder and no spouse or partner present. About 18.7% of all households were made up of individuals and 10.4% had someone living alone who was 65 years of age or older. The census reported that 16,703 people (99.9% of the population) lived in households, 11 (0.1%) lived in non-institutionalized group quarters, and no one was institutionalized. There were 5,474 households, 2,258 (41.2%) had children under the age of 18 living in them, 3,353 (61.3%) were
opposite-sex married couples living together, 686 (12.5%) had a female householder with no husband present, 326 (6.0%) had a male householder with no wife present. There were 338 (6.2%)
unmarried opposite-sex partnerships, and 49 (0.9%)
same-sex married couples or partnerships. 807 households (14.7%) were one person and 346 (6.3%) had someone living alone who was 65 or older. The average household size was 3.05. There were 4,365 families (79.7% of households); the average family size was 3.35. The age distribution was 4,422 people (26.5%) under the age of 18, 1,531 people (9.2%) aged 18 to 24, 4,058 people (24.3%) aged 25 to 44, 4,593 people (27.5%) aged 45 to 64, and 2,110 people (12.6%) who were 65 or older. The median age was 37.0 years. For every 100 females, there were 97.8 males. For every 100 females age 18 and over, there were 94.9 males. There were 5,759 housing units at an average density of 387.8 per square mile, of the occupied units 3,898 (71.2%) were owner-occupied and 1,576 (28.8%) were rented. The homeowner vacancy rate was 1.7%; the rental vacancy rate was 3.1%. 11,583 people (69.3% of the population) lived in owner-occupied housing units and 5,120 people (30.6%) lived in rental housing units.
2000 census At the
2000 census there were 12,626 people, 4,035 households, and 3,316 families in the CDP. The population density was . There were 4,146 housing units at an average density of . The
racial makeup of the CDP was 75.9% White, 0.6% African American, 1.3% Native American, 1.4% Asian, 0.1% Pacific Islander, 16.0% from other races, and 4.7% from two or more races. Hispanic or Latino of any race were 34.6%. Of the 4,035 households 41.4% had children under the age of 18 living with them, 66.9% were married couples living together, 10.9% had a female householder with no husband present, and 17.8% were non-families. 13.5% of households were one person and 6.6% were one person aged 65 or older. The average household size was 3.13 and the average family size was 3.42. The age distribution was 30.7% under the age of 18, 7.5% from 18 to 24, 27.9% from 25 to 44, 21.7% from 45 to 64, and 12.1% 65 or older. The median age was 36 years. For every 100 females, there were 97.4 males. For every 100 females age 18 and over, there were 93.2 males. The median household income was $49,852 and the median family income was $54,338. Males had a median income of $41,288 versus $25,509 for females. The per capita income for the CDP was $18,824. About 5.6% of families and 7.3% of the population were below the
poverty line, including 9.5% of those under age 18 and 6.1% of those age 65 or over. ==Parks and recreation==