Heyworth, IL has a population of 3,031 and is the 8,767th largest city in the United States. The population density is 1,042 per sq mi which is 369% higher than the Illinois average and 1050% higher than the national average. The median age in Heyworth is 37 which is approximately equal to the Illinois average of 37. In Heyworth, 63% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 82% of Heyworth residents were born in Illinois, 17% were born out of state, 0% were born outside of the United States and 0% were foreign born.