Some cities make it harder to pay off debt, according to a ranking by LendingTree.

LendingTree, a free credit monitoring service a with over nine million online users, ranked the 50 most populous U.S. metropolitan areas by a number of factors that impact the ability of residents to pay off their loans.

The factors considered in the ranking included residents' credit utilization; monthly rent-to-income ratio; the prices of goods and services; unemployment rates; and the impact of state and local laws and policies on those in debt.

In descending order, the following were ranked by LendingTree as the worst cities for paying off debt.

10. Baltimore

High unemployment, high rents and a high cost of living add to residents' debt burdens in this city.