(Seattle, WA)  --  Portland residents spend a larger portion of their incomes on mortgage payments than people in many other parts of the county.  A new Zillow report finds a Portland homeowners spend just under 28-percent of their incomes to pay the mortgage.  U.S. residents as a whole spend 20-percent of their incomes on monthly mortgage payments.  Los Angeles mortgages are the least affordable, costing more than 46-percent of median income.