Cambridge, IL has a population of 2,162 and is the 10,560th largest city in the United States. The population density is 1,091 per sq mi which is 391% higher than the Illinois average and 1104% higher than the national average. The median age in Cambridge is 42 which is approximately 12% higher than the Illinois average of 37. In Cambridge, 68% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 76% of Cambridge residents were born in Illinois, 21% were born out of state, 0% were born outside of the United States and 2% were foreign born.