Nikkō Kaidō
Oyama-shuku was a post station on the Nikkō Kaidō connecting Edo with the shrines at Nikkō, and was controlled by Utsunomiya Domain during the Edo period. Oyama town was established within Shimotsuga District, Tochigi with the establishment of the modern municipalities system on April 1, 1889. Oyama merged with the neighboring village of Otani on March 31, 1954 and was elevated to city status. On April 18, 1963, Oyama annexed the town of Mamada and village of Mita, both from Shimotsuga District. This was followed by the town of Kuwakinu on September 30, 1965.