Onslow, IA has a population of 219 and is the 24,054th largest city in the United States. The population density is 972 per sq mi which is 1680% higher than the Iowa average and 973% higher than the national average. The median age in Onslow is 35 which is approximately 9% lower than the Iowa average of 38. In Onslow, 65% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 79% of Onslow residents were born in Iowa, 17% were born out of state, 1% were born outside of the United States and 3% were foreign born.
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The population density in Onslow is 1680% higher than Iowa.
The median age in Onslow is 9% lower than Iowa.
In Onslow 93.15% of the population is White.
In Onslow 2.74% of the population is Black or African American.