Jackson County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 1,379, and it was the fourth least populated in the state. The county is named after the United States President Andrew Jackson. The county seat and only municipality in the county is Walden.

Walden is the Statutory Town that is the county seat, the most populous community, and the only incorporated municipality in Jackson County, Colorado, United States. It is situated in the center of a large open valley called North Park. People from Walden and the surrounding area refer to themselves as "North Parkers". The town population was 606 at the 2020 census. The town sits at an elevation of 8,099 feet. It was established in 1889 and was incorporated December 2, 1890. Mark A. Walden, an early postmaster, gave the community his name.