In areas with at least one good school, the median home price was nearly double the median home price versus in ZIP codes with no good schools, according to a recent report from RealtyTrac.

The study analyzed school test scores for nearly 27,000 elementary schools in more than 7,200 U.S. ZIP codes and corresponding home price affordability.

Out of 1,823 ZIP codes with at least one good school, 65 percent (1,181) were unaffordable for average wage earners, signifying that average wage earners would need to spend more than one-third of their income to buy a median-priced home. Metro areas with the least affordable ZIP codes and good schools were Los Angeles (184), New York (158), San Francisco (77), Chicago (58) and San Diego (49). Metro areas with the most affordable ZIP codes and good schools were Chicago (179), Detroit (44), Phoenix (22), Miami (20) and Charlotte (18).

The median sales price for homes in areas with good schools was $411,573 on average, 95 percent higher than the median home sales price in ZIP codes without any good schools ($210,662). Home prices in 2015 increased at the same annual pace in areas with at least one good school as in areas with no good schools. Median home prices increased 7 percent on average from 2014 to 2015 across the 1,823 ZIP codes with good schools and also increased 7 percent on average during the same time period in the 5,424 ZIP codes without a good school.

“Student achievement and high graduation rates become important factors during the home selection process,” Michael Mahon, president at Ohio-based HER Realtors, said in a statement. “Popular school districts further increase demand in subject communities leads to multiple offers and high competition amongst homebuyers.”