This summary covers 120 years of Christmas Bird Counts (CBCs) in the United States. My predecessor, Burt Monroe, summarized the all-time highs (ATHs) for CBCs in 1973 & 1986 and reported 726 species. Since then there has been a considerable amount of splitting of species and much new talent along with better gear entering the birding field. I summarized the results in 2000 and reported 823 species and 45 infraspecific forms, and in 2010 857 species, 66 infraspecific forms and 62 exotics. With the completion of the 120th season, we now have ATHs for 860 species, 93 infraspecific forms and 98 exotics. We also have nine species/forms which were only found during Count Week: Hawaiian Petrel, Galapagos/Hawaiian Petrel, Newell’s Shearwater, Key West Quail-Dove, Military Macaw, Dusky/Naumann’s Thrush, Dusky Thrush, Citrine Wagtail, and Eurasian Bullfinch. These records come from 47 states and 513 CBCs. Records occur as number & skills of observers, coordinated efforts...