The Hāmākua Mill Company was first established in 1877 by Theo Davies and his partner Charles Notley, Sr. In 1878, the first sugarcane was planted at the plantation and Hilo Iron Works was hired to build a mill. The mill was located at Paʻauilo.
By 1910, it had 4,800-acres planted in sugarcane and employed more than 600 people. The company ran three locomotives on nine miles of light gauge rail. There was a warehouse and landing below the cliff at Koholālole where ships were loaded by crane.
In 1914, the Kūkaʻiau Mill Company became a part of the Hāmākua Mill Company. In 1917, the Kūkaʻiau mill was sold and moved to Formosa (Taiwan.)
In 1917, the Hāmākua Mill Company was renamed the Hāmākua Sugar Company. The Kaiwiki Sugar Company was merged with the Theo H Davies Company-owned Laupāhoehoe Sugar Company on May 1, 1956 and operations were merged with the latter beginning January 3. 1957.
In 1978, the Hāmākua Sugar Company, Honokaʻa Sugar Company and the Laupāhoehoe Sugar Company were merged to form the Davies Hāmākua Sugar Company.
In 198 the Davies Hāmākua Sugar Company was bought by Francis Morgan and renamed the Hāmākua Sugar Company (1984-1994). The Hāmākua Sugar Company operated until October of 1994, and its closing marked the end of the sugar industry at Hāmākua, as well as the Island of Hawaiʻi.
Hāmākua Sugar Plantation Days Festival is being celebrated 10 am – 5 pm, Saturday, August 16, 21014 in Honokaʻa, commemorates the closure of the Hāmākua Sugar Co 20 years ago.