United States — Tuesday, June 29, 2010National mortgage rates on 30-year fixed mortgages remained stable at 4.50% on June 29, 2010, according to Zillow Mortgage Marketplace. As a comparison, state rates ranged from a low of 4.23% (MT) to a high of 4.75% (NV).Compared to the week prior to June 29, 2010, the national 30-year mortgage rate is down 2 basis points from 4.52%. Compared to three months ago, the 30-year rate is down 43 basis points from its average rate of 4.93%.