Plymouth, IL has a population of 383 and is the 21,118th largest city in the United States. The population density is 683 per sq mi which is 207% higher than the Illinois average and 654% higher than the national average. The median age in Plymouth is 52 which is approximately 39% higher than the Illinois average of 37. In Plymouth, 61% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 76% of Plymouth residents were born in Illinois, 24% 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 Plymouth is 207% higher than Illinois.
The median age in Plymouth is 39% higher than Illinois.
In Plymouth 98.43% of the population is White.
In Plymouth 0.00% of the population is Black or African American.