As of 2007, there were 327,780 people, and 77,922 housing units. Santa Ana's property occupation density is 4.6 per housing unit, the highest of any American city over 50,000. (By contrast, New York's is 2.8, and Los Angeles's density is 2.6 persons per housing unit.)
The racial makeup of the city, as of 2007, is 42.6% White, 1.1% African American, 0.2% Native American, 9.4% Asian, 0.4% Pacific Islander, 46.3% from Some other race, and 1.5% from two or more races. Hispanic and Latino Americans compose 79.6% of all residents, including 74.1% who are Mexican American. Non-Hispanic Whites made up 12.4% of the population in 2000 and has declined since then.
53.2% of households had children under the age of 18 living in them, 60.6% were married couples living together, 13.5% had a female householder with no husband present, and 18.1% were non-families. 12.7% of all households were made up of individuals and 4.6% had someone living alone who was 65 years of age or older. The average household size was 4.55 and the average family size was 4.72.
In the city the population was spread out with 34.2% under the age of 18, 12.8% from 18 to 24, 34.1% from 25 to 44, 13.5% from 45 to 64, and 5.5% who were 65 years of age or older. The median age was 26 years. For every 100 females there were 107.7 males. For every 100 females age 18 and over, there were 108.7 males. Santa Ana bucks the national trend on a large percentage of young people under the age of 21.
The median income for a household in the city was $43,412, and the median income for a family was $41,050. Males had a median income of $23,342 versus $21,637 for females. The per capita income for the city was $12,152. About 16.1% of families and 25.3% of the population were below the poverty line, including 24.1% of those under age 18 and 10.4% of those age 65 or over. Santa Ana is a city divided by socio-economic class stratification after decades of immigration and economic prosperity.
Amtrak, the national passenger rail system, provides service to Santa Ana several times on weekdays with less frequent service on weekends. It operates its Pacific Surfliner between San Diego to the south and either Los Angeles or Paso Robles to the north (see Santa Ana Regional Transportation Center). Greyhound USA is the largest bus transportation service in Santa Ana. Greyhound serves the continental United States and Canada. The bus lines Crucero, Intercalifornias, and others serve all points into Mexico.
Santa Ana is also served by Metrolink's Orange County Line (Oceanside to Union Station), and Inland Empire-Orange County Line (San Bernardino to San Juan Capistrano).
Public transit bus service is available via the Orange County Transportation Authority (OCTA).
John Wayne Airport is located at 18601 Airport Way Santa Ana, CA 92707. The IATA code for the airport is SNA.