Population of Kasigluk, Alaska is 543 people. 96.50% of the people are Yup'ik. It is located off the Johnson River and it is approximately 20 miles northwest of Bethel. Kasigluk first appeared on the 1940 U.S. Census as an unincorporated native village named "Kaseglok." In 1950 and 1960, it appeared as "Kasiglook." In 1969, Kasigluk and a nearby village of Nunapitchuk merged to form the city of Akolmiut. In 1982, both communities decided to dissolve Akolmiut and become separate cities again. 1990 was the first census where Kasigluk appeared with its present spelling.