Flat Rock, IL has a population of 329 and is the 21,980th largest city in the United States. The population density is 384 per sq mi which is 73% higher than the Illinois average and 324% higher than the national average. The median age in Flat Rock is 44 which is approximately 17% higher than the Illinois average of 37. In Flat Rock, 60% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 66% of Flat Rock residents were born in Illinois, 33% were born out of state, 0% were born outside of the United States and 1% were foreign born.
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The population density in Flat Rock is 73% higher than Illinois.
The median age in Flat Rock is 17% higher than Illinois.
In Flat Rock 94.83% of the population is White.
In Flat Rock 0.00% of the population is Black or African American.