Nikkō is a city in Tochigi Prefecture, Japan. As of 2 December 2020, the city had a population of 80,239, in 36,531 households. The population density was 55 persons per km2. The total area of the city is 1,449.83 square kilometres (559.78 sq mi).

Tochigi Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Tochigi Prefecture has a population of 1,897,649 and has a geographic area of 6,408 km². Tochigi Prefecture borders Fukushima Prefecture to the north, Gunma Prefecture to the west, Saitama Prefecture to the south, and Ibaraki Prefecture to the southeast.