What is population of northfield mn?

As an AI language model, I do not have access to real-time data, but according to the United States Census Bureau, the estimated population of Northfield, MN in 2020 was approximately 20,500 people. This represents an increase of more than 5% since the 2010 Census, when the population was just over 19,000. Northfield is located in Rice County, Minnesota, and is known for its renowned colleges, Carleton College and St. Olaf College. The city has a vibrant downtown area and is home to numerous parks and cultural activities.