Hennepin, IL has a population of 815 and is the 16,480th largest city in the United States. The population density is 155 per sq mi which is 30% lower than the Illinois average and 71% higher than the national average. The median age in Hennepin is 43 which is approximately 16% higher than the Illinois average of 37. In Hennepin, 68% of the population over 15 years of age are married, 90% speak English and 10% speak Spanish. 81% of Hennepin residents were born in Illinois, 14% were born out of state, 0% were born outside of the United States and 5% were foreign born.
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The population density in Hennepin is 30% lower than Illinois.
The median age in Hennepin is 16% higher than Illinois.
In Hennepin 97.67% of the population is White.
In Hennepin 0.25% of the population is Black or African American.