This is a list of the active sugar plantations as of June 1899. This list was supplied by the Portuguese Genealogical Society of Hawaii.
(From: A Nossa Heranca Portuguese: Our Portuguese Heritage; Portuguese Genealogical Society of Hawaii Newsletter, Autumn 1997, vol. 45)
Island of Hawaii
Paauhau Plantation
Hamakua Mill Co.
Kukaiau Plantation
Kukaiau Mill Co.
Ookala Sugar Co.
Laupahoehoe Sugar Co.
Hakalau Plantation
Honolu Sugar Co.
Pepeekeo Sugar Co.
Onomea Sugar Co.
Waiakea Mill Co.
Hawaiian Agricultural Co.
Hutchinson Sugar Plantation Co.
Hawi Mill
Beecroft Plantation
Union Mill Co.
Kohala Sugar Co.
Halawa Plantation
Niulii Mill
Pacific Sugar Mill
Honokaa Sugar Co.
Kona Sugar Co.
Hilo Portuguese Sugar Mill Co.
Island of Kauai
Kilauea Sugar Co.
Makee Sugar Co.
Hanamaulu Plantation
Lihue Plantation
Koloa Sugar Co.
Eleele Plantation
Hawaiian Sugar Co.
Gay & Robinson
Waimea Sugar Mill
Kekaha Sugar Co., Ltd.
Grove Farm
Island of Lanai
Manunalei Sugar Co.
Island of Maui
Olowalu Sugar Co.
Pioneer Mill Co.
Wailuku Sugar Co.
Hawaiian Commercial & Sugar Co.
Paia Plantation
Haiku Sugar Co.
Hana Plantation
Hamoa Plantation
Kipahulu Plantation
Nahiki sugar Co.
Island of Molokai
American Sugar Co.
Kamalo Sugar Co.
Island of Oahu
Ewa Plantation Co.
Waianae Co.
Waialua Plantation Co.
Kahuku Plantation Co.
Laie Plantation
Heeia Agricultural Co.
Waimanalo Sugar Co.
Oahu Sugar Co.
Honolulu Sugar Co.
[Reprinted by permission of the Portuguese Genealogical and Heritage Society of Hawaii]