Bellwood, IL has a population of 19,146 and is the 2,270th largest city in the United States. The population density is 7,983 per sq mi which is 3491% higher than the Illinois average and 8712% higher than the national average. The median age in Bellwood is 36 which is approximately 5% lower than the Illinois average of 37. In Bellwood, 42% of the population over 15 years of age are married, 82% speak English and 16% speak Spanish. 70% of Bellwood residents were born in Illinois, 20% were born out of state, 1% were born outside of the United States and 8% were foreign born.