Clay City, IL has a population of 824 and is the 16,397th largest city in the United States. The population density is 462 per sq mi which is 108% higher than the Illinois average and 410% higher than the national average. The median age in Clay City is 37 which is approximately 1% lower than the Illinois average of 37. In Clay City, 62% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 88% of Clay City residents were born in Illinois, 12% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in Clay City is 108% higher than Illinois.
The median age in Clay City is 1% lower than Illinois.
In Clay City 100.00% of the population is White.
In Clay City 0.00% of the population is Black or African American.