Which states have the most Section 8 housing per person?

I recently used open data from HUD about public-housing inventory and Census population data to examine which states had the most Section 8 housing units per person in 2010. (Section 8 is a federally subsidized program for low-income renters.) Here’s the top 6 and bottom 6:

which states have the most section 8 housing

I’m not surprised that DC is number one, since it has the nation’s highest poverty rate. Nor am I surprised that NYC, with its relatively well-organized housing initiatives, is number two. But what about Massachusetts and North Dakota? Any ideas? Here’s a visualization of this data:

Section 8 Housing per State Map