Clarksburg, MO has a population of 226 and is the 23,900th largest city in the United States. The population density is 392 per sq mi which is 353% higher than the Missouri average and 332% higher than the national average. The median age in Clarksburg is 39 which is approximately 1% higher than the Missouri average of 38. In Clarksburg, 56% of the population over 15 years of age are married, 78% speak English and 20% speak Spanish. 73% of Clarksburg residents were born in Missouri, 19% were born out of state, 1% were born outside of the United States and 8% were foreign born.