The middle class income range is from 67 percent to 200 percent of a state's median income, per Pew Charitable Trust's definition. Maryland has the highest median income at $72,483 as of 2013, putting the middle class income range for that state at $48,322 to $144,966.
Mississippi has the lowest median income with $37,963, and middle class income ranges from $25,309 to $75,926. Nebraska, the state with the median income level of all states plus Washington, D.C., has a median state income of $51,440. Its middle class ranges from $34,293 to $102,460.
CNN Money Magazine gives four characterizations of middle class other than income: wealth, consumption, aspiration and demographics.