From The Official Pueblo Inventory of Cultural Resources

All “A” are:

Properties Listed on the Pueblo Register of Historic Places (Pueblo Historic Landmarks)

A-1 to A-25

All “B” are:

 Properties listed on the Colorado Register of Historic Places

B-1 to B-5

All “C” are:

Properties listed on the National Register of Historic

Places, or located in National Register Historic Districts

C-1 to C-117

Note: National Register Properties outside historic districts are summarized from published Colorado Historical Society descriptions. Properties within Historic Districts (district names denoted in description) summarized from 1980 Pueblo Building Survey and Nominations.