Millbrook, IL has a population of 341 and is the 21,776th largest city in the United States. The population density is 164 per sq mi which is 26% lower than the Illinois average and 81% higher than the national average. The median age in Millbrook is 47 which is approximately 27% higher than the Illinois average of 37. In Millbrook, 63% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 83% of Millbrook residents were born in Illinois, 14% were born out of state, 1% were born outside of the United States and 2% were foreign born.
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The population density in Millbrook is 26% lower than Illinois.
The median age in Millbrook is 27% higher than Illinois.
In Millbrook 99.71% of the population is White.
In Millbrook 0.00% of the population is Black or African American.