La Paz County Arizona has 8 places on the National Register of Historic Places including 3 places of National significance and 3 places of Statewide significance. Significant places include Harquahala Mountain Smithsonian Solar Observatory Historic District, Harquahala Peak Observatory, Ripley Intaglios, Eagletail Petroglyph Site and Old La Paz.
Prehistoric cultural affiliation(s) include Hohokam, Late Archaic, Patayan and Yuman dating back to 1999 BC.
Some of the country's most noteable architects helped create the La Paz County places including Lucas, Frank, et al., Thomas Banks, John King and John F. Collins. Prominent architectural styles found in La Paz Country are .