St. Joseph, IA has a population of 121 and is the 26,393rd largest city in the United States. The population density is 140 per sq mi which is 157% higher than the Iowa average and 55% higher than the national average. The median age in St. Joseph is 14 which is approximately 63% lower than the Iowa average of 38. In St. Joseph, 85% of the population over 15 years of age are married, 95% speak English and 5% speak Spanish. 95% of St. Joseph residents were born in Iowa, 5% 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 St. Joseph is 157% higher than Iowa.
The median age in St. Joseph is 63% lower than Iowa.
In St. Joseph 100.00% of the population is White.
In St. Joseph 0.00% of the population is Black or African American.