|Motto: "Harmony And Industry"|
|Area||0.80 sq mi (2 km2)|
|- land||0.80 sq mi (2 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||2,470 / sq mi (954 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Rockdale, Illinois|
According to the 2010 census, the village has a total area of 0.80 square miles (2.1 km2), all land.
As of the census of 2000, there were 1,888 people, 762 households, and 473 families residing in the village. The population density was 2,377.4 people per square mile (922.7/km²). There were 826 housing units at an average density of 1,040.1 per square mile (403.7/km²). The racial makeup of the village was 82.89% White, 0.85% African American, 0.48% Native American, 0.37% Asian, 10.86% from other races, and 4.56% from two or more races. Hispanic or Latino of any race were 21.98% of the population.
There were 762 households out of which 30.2% had children under the age of 18 living with them, 45.0% were married couples living together, 10.8% had a female householder with no husband present, and 37.8% were non-families. 31.1% of all households were made up of individuals and 11.4% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 3.11.
In the village the population was spread out with 25.2% under the age of 18, 9.4% from 18 to 24, 32.3% from 25 to 44, 20.6% from 45 to 64, and 12.6% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 101.5 males. For every 100 females age 18 and over, there were 93.4 males.
The median income for a household in the village was $39,954, and the median income for a family was $47,232. Males had a median income of $35,761 versus $24,375 for females. The per capita income for the village was $18,738. About 7.7% of families and 9.3% of the population were below the poverty line, including 13.1% of those under age 18 and 4.5% of those age 65 or over.
Emergency service 
The village's fire suppression services are operated by the Rockdale Fire Protection district. EMS is provided by Kurtz Ambulance Service, and law enforcement by Rockdale Police.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.