My colleague Chris Kirk has pulled together a great interactive map highlighting gender pay gaps by state and by county. Utah is the most inegalitarian state, with its women earning just 55 cents for every dollar earned by a male Utah resident. The most egalitarian states are Nevada and Florida (76 cents) followed by New York, North Carolina, and Maryland (75 cents).
On a county-level basis the most egalitarian major cities are DC and Dallas areas followed by San Francisco, Los Angeles, Austin, Santa Fe, New York, and Boston. I believe that on a metro area basis LA is the most egalitarian.