Monmouth, IA has a population of 169 and is the 25,166th largest city in the United States. The population density is 301 per sq mi which is 450% higher than the Iowa average and 232% higher than the national average. The median age in Monmouth is 37 which is approximately 3% lower than the Iowa average of 38. In Monmouth, 59% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 93% of Monmouth residents were born in Iowa, 6% 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 Monmouth is 450% higher than Iowa.
The median age in Monmouth is 3% lower than Iowa.
In Monmouth 98.22% of the population is White.
In Monmouth 0.00% of the population is Black or African American.