Harvard, IL has a population of 9,589 and is the 4,062nd largest city in the United States. The population density is 1,177 per sq mi which is 429% higher than the Illinois average and 1199% higher than the national average. The median age in Harvard is 28 which is approximately 25% lower than the Illinois average of 37. In Harvard, 62% of the population over 15 years of age are married, 62% speak English and 37% speak Spanish. 64% of Harvard residents were born in Illinois, 17% were born out of state, 1% were born outside of the United States and 19% were foreign born.