Certified Local Districts are historic districts established by state or local governments that have been certified by the Secretary of the Interior as substantially meeting the National Register Criteria for Evaluation. Such certification may be used as a basis for applying for federal historic preservation related income tax credits.

Boulder County

Boulder

Mapleton Hill Historic District

Certified Historic District (Local Landmark District eligible for the National Register)
Roughly bounded by Broadway, the alley between Pearl and Spruce Sts., 4th St., and the alley between Dewey St. and Concord Ave.
Officially eligible 9/5/1984, 5BL.535

Denver City & County

Denver

Lafayette Street Historic District

Certified Historic District (Local Landmark District eligible for the National Register)
2100 Block of Lafayette St.
Officially Eligible 5/7/89, 5DV.2315

Lower Downtown Historic District

Certified Historic District (Local Landmark District eligible for the National Register)
Wynkoop to Market between 13th and 20th Streets
Officially Eligible 1/5/1989, 5DV.47
 

Pitkin County

Aspen

Aspen Historic District

Certified Historic District(Local Landmark District eligible for the National Register)
Roughly bounded by Durant Ave., the alley behind Main St., Monarch and Hunter Sts.
Officially eligible 9/5/1984, 5PT.113