Since you seem unwilling to browse any sources I cite, I'm not going to bother looking up suburban poverty.
If you are interested in understanding poverty in the US, you should skim that 642 page report. It's a fantastic report and it answers many questions one might have about the material conditions of the poor (and many other categories of people).
http://www.ers.usda.gov/Publications/EIB59/EIB59.pdf
Some quick math suggests about 30% of poor people live in nonmetro areas.
http://www.ers.usda.gov/Briefing/Population/
Since you seem unwilling to browse any sources I cite, I'm not going to bother looking up suburban poverty.
If you are interested in understanding poverty in the US, you should skim that 642 page report. It's a fantastic report and it answers many questions one might have about the material conditions of the poor (and many other categories of people).