Prehistoric cultural affiliation(s) include Anasazi Basketmaker Ii, Anasazi Basketmaker Iii, Athabascan and Ute dating back to 499 BC.
The famous person Charles Newman is associated with one of more of the La Plata County historic places.
Some of the country's most noteable architects helped create the La Plata County places including Gen. William J. Palmer, Charles Thomas, Dan Cummins, Baldwin Locomotive Works, Works Progress Administration and E.F. Scheide. Prominent architectural styles found in La Plata Country are Late 19th And 20th Century Revivals, Late Victorian and Mission/Spanish Revival.