Joplin, MO has a population of 51,231 and is the 794th largest city in the United States. The population density is 1,394 per sq mi which is 1513% higher than the Missouri average and 1438% higher than the national average. The median age in Joplin is 37 which is approximately 5% lower than the Missouri average of 38. In Joplin, 53% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 57% of Joplin residents were born in Missouri, 39% were born out of state, 1% were born outside of the United States and 3% were foreign born.