The Ohinemuri County Council first met on 17 November 1885.[1] It was formed from a portion of Thames County.[2] A 1919 petition[3] resulted in loss of the western part of the area[4] to a new Hauraki Plains County in 1920.[5]
The population was 1,516 in 1891,[7] 3,056 in 1945[8] and 5,579 in 1986.[9]
In 1923 Ohinemuri County covered 253mi2 (660km2) and had a population of 2,678, with 66mi (106km) of gravel roads, 55mi (89km) of mud roads and 50mi (80km) of tracks.[10]
The 1911 Italianate county offices at 41 Belmont Road, Paeroa, were used by the county until 1986. They are now used by Hauraki Māori Trust Board and protected by an A Category listing in Hauraki District Plan.[11]