San Diego, Texas

===2000 census===
At the [[2000 United States Census|2000 census]] there were 4,753 people, 1,548 households, and 1,187 families living in the city. The population density was {{convert|2,917.1|PD/sqmi|PD/km2|sp=us|adj=off}}. There were 1,793 housing units at an average density of {{convert|1,100.4|/sqmi|/km2|sp=us|adj=off}}.  The [[Race and ethnicity in the United States Census#2000 census|racial makeup]] of the city was 78.06% White, 0.27% African American, 0.78% Native American, 0.02% Asian, 0.04% Pacific Islander, 17.72% from other races, and 3.11% from two or more races. Hispanic or Latino of any race were 96.87%.<ref name="GR2" />

Of the 1,548 households 40.5% had children under the age of 18 living with them, 47.3% were married couples living together, 24.4% had a female householder with no husband present, and 23.3% were non-families. 21.3% of households were one person and 11.0% were one person aged 65 or older. The average household size was 3.03 and the average family size was 3.52.

The age distribution was 32.9% under the age of 18, 9.5% from 18 to 24, 25.1% from 25 to 44, 19.4% from 45 to 64, and 13.1% 65 or older. The median age was 31 years. For every 100 females, there were 87.3 males. For every 100 females age 18 and over, there were 84.5 males.

The median household income was $19,250 and the median family income  was $25,104. Males had a median income of $21,875 versus $14,622 for females. The per capita income for the city was $9,782. About 26.8% of families and 32.2% of the population were below the [[poverty line]], including 44.3% of those under age 18 and 26.8% of those age 65 or over.