Sun City is the a master-planned community for active adults (the community's catchphrase for senior citizens over age 55).
The four-square mile residential community has two public golf courses, two recreation centers with tennis courts and swimming pools, and a "small-town" of small shops for resident consumers.
Another development boom arrived in the late 1980's and 1990's with another master-planned community on the southeast edge of Sun City: Menifee and as of 2005, the one-square-mile area of homes, condos, schools, retail shops, golf courses and tennis courts still grows.
Recently, there has been an effort to incorporate Sun City and some or all of the nearby areas of Menifee and Romoland as Menifee Valley. As of September 2006, Riverside County is currently investigating the viability of the proposed new city.
Menifee Valley Medical Center is a General Acute Care Hospital in Sun City with Basic Emergency Services as of 2005. 
|Sun City, California|
|Riverside County and the state of California|
|- City||7.8 sq mi (20.2 km²)|
|- Land||7.8 sq mi (20.2 km²)|
|- Water||0 sq mi (0 km²)|
|- Density||2,278.6/sq mi (879.9/km²)|
Sun City is located at GR1.(33.708291, -117.199152)
As of the censusGR2 of 2000, there were 17,773 people, 8,750 households, and 5,197 families residing in the CDP. The population density was 879.8/km² (2,280.0/mi²). There were 9,440 housing units at an average density of 467.3/km² (1,211.0/mi²). The racial makeup of the CDP was 89.63% White, 2.13% African American, 0.51% Native American, 1.19% Asian, 0.15% Pacific Islander, 4.11% from other races, and 2.29% from two or more races. Hispanic or Latino of any race were 12.31% of the population.
There were 8,750 households out of which 12.7% had children under the age of 18 living with them, 52.6% were married couples living together, 5.2% had a female householder with no husband present, and 40.6% were non-families. 37.5% of all households were made up of individuals and 31.1% had someone living alone who was 65 years of age or older. The average household size was 1.99 and the average family size was 2.57.
In the CDP the population was spread out with 14.2% under the age of 18, 2.6% from 18 to 24, 13.2% from 25 to 44, 18.0% from 45 to 64, and 51.9% who were 65 years of age or older. The median age was 66 years. For every 100 females there were 78.9 males. For every 100 females age 18 and over, there were 74.9 males. Sun City is renowned for a large senior citizen population, most of them are white non-Hispanic Americans. Sun City has multiple ethnic ancestral groups and the area has a sizable American Jewish community.
The median income for a household in the CDP was $29,814, and the median income for a family was $38,131. Males had a median income of $41,174 versus $29,036 for females. The per capita income for the CDP was $19,859. About 6.0% of families and 8.8% of the population were below the poverty line, including 14.4% of those under age 18 and 6.5% of those age 65 or over.