Whitman County was originally a part of Walla Walla County

Whitman County was originally a part of Walla Walla County, which was established in 1853-1854. In 1859 the county was divided at the Snake River, and the northern part was known as Spokane County with Colville as the county seat. In 1863 Stevens County, named for the first territorial governor, was formed which in 1864 annexed the county of Spokane. On November 29, 1871, Whitman County was created by an act of the territorial legislature; the north, south, and east boundaries were established then as they are at present, the Columbia River being the western boundary. There were no incorporated towns in the county at the time. In 1883, the present boundaries were established. Several times since efforts have been made to divide the county, but on account of rivalry between towns for the honor of being county seat. One meeting for this purpose was held in Rosalia, November 20, 1889.

Taken from: A Short History of Rosalia; by Alice V. Campbell

Here are the the Communities in Whitman County (www.whitmancounty.org)