Nagaokakyō is a city located in Kyoto Prefecture, Japan. As of 1 September 2023, the city has an estimated population of 82,279 in 37718 households and a population density of 4700 persons per km2. The total area of the city is 19.17 square kilometres (7.40 sq mi).

Kyoto Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Kyoto Prefecture has a population of 2,561,358 and has a geographic area of 4,612 square kilometres (1,781 sq mi). Kyoto Prefecture borders Fukui Prefecture to the northeast, Shiga Prefecture to the east, Mie Prefecture to the southeast, Nara Prefecture and Osaka Prefecture to the south, and Hyōgo Prefecture to the west.