National Register of Historic Places listings in Boulder County, Colorado

This is a list of the National Register of Historic Places listings in Boulder County, Colorado.

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Boulder County, Colorado, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.

There are 89 properties and districts listed on the National Register in the county, including 2 National Historic Landmarks. Another two properties were once listed but have been removed.

This National Park Service list is complete through NPS recent listings posted April 4, 2025.