The weekly average rate borrowers were quoted on Zillow Mortgage Marketplace for thirty-year mortgages fell during the past week. Last week's rate was 5.06 percent, down from 5.10 percent the week prior, according to the Zillow Mortgage Rate Monitor, compiled by leading real estate Web site Zillow.com®.

Meanwhile, rates for 15-year fixed mortgages decreased to 4.68 percent, down from 4.73 percent and 5-1 adjustable rate mortgages decreased substantially, down to 4.47 percent from 4.65 percent the week prior.

Rates for 30-year fixed purchase mortgages fell even further on Monday, with the average rate on Zillow Mortgage Marketplace at 4.99 percent.

Thirty-year fixed mortgage rates varied by state. Maryland mortgage rates and New Jersey mortgage rates decreased the most, down from 5.17 percent to 5.10 percent in Maryland, and from 5.12 percent to 5.05 percent in New Jersey. Georgia mortgage rates (4.99%) and Florida mortgage rates (4.99%) were the lowest in the country, while Ohio mortgage rates (5.17%) were the highest. California mortgage rates were the most requested among all states.

The Zillow Mortgage Rate Monitor is compiled each week using thousands of mortgage rates quoted on Zillow Mortgage Marketplace by mortgage lenders to borrowers who have submitted loan requests. State-level data is gathered for the top 20 states with the highest quote volume on Zillow.