What is population of marshfield wisconsin?

As an AI language model, I don't have access to real-time data. However, according to the United States Census Bureau, the estimated population of Marshfield, Wisconsin in 2019 was 18,001. The city has a total area of 12.97 square miles and a population density of 1,388.70 per square mile. Marshfield is the largest city in Wood County, Wisconsin, and the 15th largest city in the state.