History since the establishment of the county

• January 26, 1884 - Usuki County becomes Higashiusuki District. The county office is set up in Okatomi. (3 towns and 53 villages)
• May 1, 1889 - New towns and villages system is established, the following towns and villages were established. (2 towns and 16 villages)
  • Nobeoka Town ← Nobeoka Castle, Okatomi Village, Funakura Town (now Nobeoka City)
  • Okatomi Village ← Okatomi Village, Hozaijima Village (now Nobeoka City)
  • Tsunetomi ← Misu, Tsunetomi, Dekitamura (now Nobeoka)
  • Igata Village ← Akamizu Village, Taina Village, Kushizu Tororo Village, Ifukugata Village (now Nobeoka City)
  • Kadokawa Village ← Kadokawa Oue Village, Kawauchi Village, Kakusa Village, Angawa Village (now Kadokawa Town)
  • Hososhima Town (now Hyuga City)
  • Tomitaka Village ← Zaikoji Village, Shiomi Village, Tomitaka Village, Hichiya Village (now Hyuga City)
  • Iwawaki ← Koyukiwaki, Hiraiwa (now Hyuga City)
  • Togo Village ← San'in Village, Yaehara Sakonouchi Village, Tsuboya Village, Shimosanka Village (now Hyuga City)
  • Nango Village ← Uedagawa Village, Nakatogawa Village, Oni Jinno Village, Kammon Village, Mizuseiya Village (now Misato Town)
  • Saigo Village ← Yamasanga Village, Ohara Village, Tashiro Village, Tateishi Village (now Misato Town)
  • Kitago Village ← Unama Village, Irishita Village, Kuroki Village (now Misato Town)
  • Kitakata Village (now Nobeoka City)
  • Minakata Village ← Miwa Village, Minakata Village, Onuki Village (now Nobeoka City)
  • Tokai Village ← Daitake Town, Awana Village, Inabazaki Village, Kaiko Village, Kawashima Village (now Nobeoka City)
  • Kitagawa Village ← Kawauchi Namura, Nagai Village (now Nobeoka City)
  • Minamiura ← Urajiri, Sugae, Kumanoe, Shimanoura (now Nobeoka)
  • Kitaura ← Furue, Ichimura, Miyanoura, Mikawauchi (now Nobeoka)
• April 1, 1897 - County system enforced.
• October 1, 1921 - Tomitaka village becomes the town of Tomitaka by through the town system. (3 towns and 15 villages)
• April 1, 1923 - The county council is abolished. The county office remains.
• July 1, 1926 - The county government office is abolished. After that, it will be called Area Classification.
• April 1, 1930 - Nobeoka Town, Okatomi Village, Tsunetomi Village merged, Nobeoka Town was reestablished. (3 towns and 13 villages)
• February 11, 1933 - Nobeoka Town became the city of Nobeoka by through the city system and left the county. (2 towns and 13 villages)
• October 25, 1936 - Igata Village and Tokai-mura are incorporated into the city of Nobeoka. (3 towns and 10 villages)
• October 1, 1937 - Tomishima Town was reestablished through the merger of Tomitaka Town and Hososhima Town . (2 towns and 10 villages)
• April 1, 1949 - Nishiusuki district Morotsuka-shiiba changes counties. (2 towns and 12 villages)
• April 1, 1951 - Toshima and Iwawaki-mura merged to form the city of Hyuga , leaving the county. (1 town and 11 villages)
• April 1, 1955 - Minakata Village and Minamiura Village transferred to Nobeoka City. (1 town 9 villages)
• April 1, 1969- Togo Town becomes the township of Togo Town. (2 towns and 8 villages)
• January 11, 1972 - Kitagawa-mura becomes the town of Kitagawa through enforcement of the town system. Kitaura Village also becomes the town of Kitaura.
  • January 1, 2006 - Misato Town is established by the merger of Nango Village, Saigo Village, and Kitago Village. (6 towns and 2 villages)
  • February 20, 2006 - Kitakata and Kitaura are transferred to Nobeoka. (4 towns and 2 villages)
  • February 25, 2006 - Togo Town is incorporated into Hyuga City. (3 towns and 2 villages)
• March 31, 2007 - The town of Kitagawa is incorporated into Nobeoka. (2 towns and 2 villages)