Lomita originally spanned 7 square miles. However, over time, much of this area was annexed by neighboring cities. A notable example is "Lomita Fields," now Zamperini Field (the Torrance Municipal Airport).
As of the census of 2000, there were 20,046 people, 8,015 households, and 5,033 families residing in the city. The population density was 4,073.6/km² (10,572.7/mi²). There were 8,295 housing units at an average density of 1,685.6/km² (4,375.0/mi²). The racial makeup of the city was 66.16% White, 4.18% African American, 0.70% Native American, 11.41% Asian, 0.52% Pacific Islander, 10.79% from other races, and 6.23% from two or more races. Hispanic or Latino of any race were 26.20% of the population.
There were 8,015 households out of which 32.9% had children under the age of 18 living with them, 43.0% were married couples living together, 14.5% had a female householder with no husband present, and 37.2% were non-families. 30.6% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.13.
In the city the population was spread out with 25.5% under the age of 18, 7.6% from 18 to 24, 34.2% from 25 to 44, 21.9% from 45 to 64, and 10.9% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 92.2 males. For every 100 females age 18 and over, there were 87.8 males.
The median income for a household in the city was $51,360, and the median income for a family was $53,003. Males had a median income of $41,582 versus $31,353 for females. The per capita income for the city was $27,748. About 9.3% of families and 11.1% of the population were below the poverty line, including 15.3% of those under age 18 and 11.0% of those age 65 or over.
In the state legislature Lomita is located in the 28th Senate District, represented by Democrat Jenny Oropeza, and in the 53rd Assembly District, represented by Democrat Ted Lieu. Federally, Lomita is located in California's 36th congressional district, which has a Cook PVI of D +11 and is represented by Democrat Jane Harman.
The United States Postal Service Lomita Post Office is located at 25131 Narbonne Avenue.
Lomita residents are within the Los Angeles Unified School District. The area is within Board District 7. As of 2008 Dr. Richard Vladovic represents the district.
Elementary schools that serve Lomita include:
All residents are zoned to: