2005 Out of Reach Report from the National Low Income Housing Coalition.  Detailed annual report:

Out of Reach is a side-by-side comparison of wages and rents in every county, Metropolitan Area (MSAs/HMFAs), combined nonmetropolitan area and state in the United States.

We really don't need to hear "working" and "poor" in the same sentence ever again.  Long past time for a Living Wage.  Rep. Barbara Lee's H.R. 1050 is a good start.