Mortgage rates remained low last week and many states saw sub-5.00 percent rates for the first time in recent history. The weekly average rates for 30-year fixed mortgages declined to 4.96 percent, down from 5.15 percent the week prior, according to the Zillow Mortgage Rate Monitor, compiled by leading real estate Web site Zillow.com(R).

Rates for 15-year fixed mortgages decreased to 4.91 percent, down from 5.00 percent and 5-1 adjustable rate mortgages decreased significantly to 5.54 percent from 5.94 percent.

Rates for 30-year fixed mortgages remained fairly steady on Monday evening with the average rate on Zillow Mortgage Marketplace at 5.11 percent.

At a state level, the 30-year fixed mortgage rate in Arizona had the biggest decrease, falling from 5.22 percent to 4.40 percent. Rates on 30-year fixed mortgages were lowest in the states of Georgia (4.87%) and Texas (4.88%), while Illinois (5.07%), Maryland (5.05%) and New York (5.05%) had the highest rates.