 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 municipalities system on April 1, 1889.Oyama merged with the neighboring village of Otani on March 31, 1954 and was elevated to city status.