What is the poorest country in the northern hemisphere?

Haiti

Actually, according to "TheRichest.org", the poorest country entirely in the northern hemisphere is Liberia, but the Democratic Republic of the Congo straddles the equator and is the poorest in the world.

Liberia's GDP Per Capita: $456 (As of 2011), second poorest in the world;

Haiti's GDP Per Capita: $1,235 (As of 2011), 19th poorest.