Plymouth, IA has a population of 344 and is the 21,722nd largest city in the United States. The population density is 787 per sq mi which is 1341% higher than the Iowa average and 769% higher than the national average. The median age in Plymouth is 51 which is approximately 33% higher than the Iowa average of 38. In Plymouth, 74% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 81% of Plymouth residents were born in Iowa, 18% 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 Plymouth is 1341% higher than Iowa.
The median age in Plymouth is 33% higher than Iowa.
In Plymouth 98.26% of the population is White.
In Plymouth 0.29% of the population is Black or African American.