North Dakota led the country with the highest gain in state income for 2011 (8.1%), the largest increase in per-capita state income (6.7%), and the highest gain in personal income during the last quarter of 2011 (1.5%).Note: net worth is different than net income. I wonder how much per-capita net worth grew in North Dakota in 2011? It doesn't take many new millionaires to affect a state with a low population like North Dakota.