Thornburg, IA has a population of 75 and is the 27,531st largest city in the United States. The population density is 381 per sq mi which is 598% higher than the Iowa average and 321% higher than the national average. The median age in Thornburg is 33 which is approximately 13% lower than the Iowa average of 38. In Thornburg, 60% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 97% of Thornburg residents were born in Iowa, 3% 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 Thornburg is 598% higher than Iowa.
The median age in Thornburg is 13% lower than Iowa.
In Thornburg 100.00% of the population is White.
In Thornburg 0.00% of the population is Black or African American.