Marshfield, MO has a population of 6,958 and is the 5,202nd largest city in the United States. The population density is 1,334 per sq mi which is 1444% higher than the Missouri average and 1373% higher than the national average. The median age in Marshfield is 36 which is approximately 5% lower than the Missouri average of 38. In Marshfield, 61% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 66% of Marshfield residents were born in Missouri, 32% were born out of state, 0% were born outside of the United States and 1% were foreign born.