Marietta, IL has a population of 100 and is the 26,928th largest city in the United States. The population density is 366 per sq mi which is 65% higher than the Illinois average and 304% higher than the national average. The median age in Marietta is 56 which is approximately 49% higher than the Illinois average of 37. In Marietta, 67% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 89% of Marietta residents were born in Illinois, 11% 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 Marietta is 65% higher than Illinois.
The median age in Marietta is 49% higher than Illinois.
In Marietta 83.00% of the population is White.
In Marietta 15.00% of the population is Black or African American.