See also https://ykalaska.wordpress.com/2006/03/13/richest-cities-in-the-us-bethel/

http://en.wikipedia.org/wiki/Poorest_places_in_the_United_States

100 Poorest Counties by Per Capita Income

Number of counties by state in the 100 poorest counties: Texas, 17; Kentucky, 16; Mississippi, 14; South Dakota, 10; Louisiana, 5; Alabama, 4; Georgia, 4; Montana, 4; New Mexico, 4; North Dakota, 3; Arizona, 2; Idaho, 2; Nebraska, 2; Tennessee, 2; West Virginia, 2; Alaska, 1; Arkansas, 1; Colorado, 1; Florida, 1; Missouri, 1; Oklahoma, 1; South Carolina, 1; Utah, 1; Wisconsin, 1.

Twenty-six states do not have any counties in the 100 poorest counties.

United States of America: $21,587
#8 Wade Hampton, Alaska $8,717

100 Poorest Counties by Median Household Income

Number of counties by state in the 100 poorest counties: Kentucky, 29; Mississippi, 13; Texas, 10; Alabama, 7; Arkansas, 7; South Dakota, 6; West Virginia, 6; Louisiana, 5; Georgia, 3; Missouri, 3; Oklahoma, 3; Tennessee, 2; Colorado, 1; Hawai’i, 1; North Dakota, 1; New Mexico, 1; South Carolina, 1; Virginia, 1.

Thirty-two states do not have any counties in the 100 poorest counties.
Alaska?

United States of America: $41,994