 The town of Montesano was born even though it was not incorporated until November 26, 1883 by the Washington Territorial Legislature.Prior to that time, the name "Montesano" was used to refer to the homestead of Isaiah Lancaster Scammon and his wife Lorinda.They filed a 640 Donation Land Claim on January 15, 1853 on the Chehalis River, opposite the mouth of The Wynoochee River, in the area now referred to as "South Montesano".