Lathrop, MO has a population of 2,249 and is the 10,381st largest city in the United States. The population density is 1,260 per sq mi which is 1358% higher than the Missouri average and 1290% higher than the national average. The median age in Lathrop is 37 which is approximately 4% lower than the Missouri average of 38. In Lathrop, 59% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 74% of Lathrop residents were born in Missouri, 24% were born out of state, 1% were born outside of the United States and 1% were foreign born.