Annapolis Mall in Maryland has a quite nice nursing mothers area according to mommies who've breastfed and pumped there.
One mom wrote:
"we stopped into the family restroom area that was kinda in the middle... one of the hallways connecting the new area to the old part of the mall. I was very impressed!...There was also a tv playing some animated show or movie and a couple play areas with toys. And two curtained off nursing areas with comfy chairs."