Justice, IL has a population of 12,957 and is the 3,221st largest city in the United States. The population density is 4,564 per sq mi which is 1953% higher than the Illinois average and 4938% higher than the national average. The median age in Justice is 31 which is approximately 17% lower than the Illinois average of 37. In Justice, 49% of the population over 15 years of age are married, 55% speak English and 11% speak Spanish. 68% of Justice residents were born in Illinois, 7% were born out of state, 0% were born outside of the United States and 24% were foreign born.