Marathon, IA has a population of 270 and is the 23,017th largest city in the United States. The population density is 360 per sq mi which is 560% higher than the Iowa average and 298% higher than the national average. The median age in Marathon is 47 which is approximately 24% higher than the Iowa average of 38. In Marathon, 62% of the population over 15 years of age are married, 88% speak English and 13% speak Spanish. 69% of Marathon residents were born in Iowa, 25% were born out of state, 0% were born outside of the United States and 6% were foreign born.
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The population density in Marathon is 560% higher than Iowa.
The median age in Marathon is 24% higher than Iowa.
In Marathon 98.15% of the population is White.
In Marathon 0.00% of the population is Black or African American.