Erda (/ˈɜːrdə/ UR-də) is a census-designated place (CDP) in Tooele County, Utah, United States, located just south of Stansbury Park and just north of the county seat of Tooele. The population was 4,642 at the 2010 census, a significant increase from the 2000 figure of 2,473.
According to the United States Census Bureau, the CDP has a total area of 22.5 square miles (58.2 km²), all of it land.
As of the census of 2000, there were 2,473 people, 697 households, and 623 families residing in the CDP. The population density was 110.1 people per square mile (42.5/km²). There were 722 housing units at an average density of 32.2/sq mi (12.4/km²). The racial makeup of the CDP was 96.93% White, 0.28% African American, 0.36% Native American, 0.32% Asian, 0.53% Pacific Islander, 0.61% from other races, and 0.97% from two or more races. Hispanic or Latino of any race were 4.25% of the population.
There were 697 households out of which 54.2% had children under the age of 18 living with them, 81.3% were married couples living together, 5.0% had a female householder with no husband present, and 10.6% were non-families. 9.3% of all households were made up of individuals and 2.4% had someone living alone who was 65 years of age or older. The average household size was 3.55 and the average family size was 3.81.
In the CDP, the population was spread out with 38.0% under the age of 18, 8.1% from 18 to 24, 28.9% from 25 to 44, 21.1% from 45 to 64, and 3.9% who were 65 years of age or older. The median age was 30 years. For every 100 females, there were 105.2 males. For every 100 females age 18 and over, there were 103.6 males.
The median income for a household in the CDP was $62,286, and the median income for a family was $65,494. Males had a median income of $42,386 versus $30,574 for females. The per capita income for the CDP was $18,649. About 3.5% of families and 3.6% of the population were below the poverty line, including 2.3% of those under age 18 and 9.8% of those age 65 or over.