Cobden, IL has a population of 1,359 and is the 13,277th largest city in the United States. The population density is 1,115 per sq mi which is 401% higher than the Illinois average and 1130% higher than the national average. The median age in Cobden is 34 which is approximately 10% lower than the Illinois average of 37. In Cobden, 47% of the population over 15 years of age are married, 77% speak English and 23% speak Spanish. 67% of Cobden residents were born in Illinois, 20% were born out of state, 1% were born outside of the United States and 12% were foreign born.