Three ZIP Codes on Tucson's south side led the way for highest percentage of homes sold among those on the Multiple Listing Service in May.

The Tucson Association of Realtors reported home sales were highest in the ZIP Codes 85706, with 48.8 percent of listings sold, 85756 at 47.3 percent and 85746 at 34.6 percent.

A key contributing factor could be price, an association official said.

“The prices are all based on affordability," said Tucson Association of Realtors' Multiple Listing Service President Kim Clifton. "The majority of the sales are close to or below the median sales price, which is $167,000.”

Clifton also pointed to the fact that a low cost of living can make housing more affordable in Tucson.

“The cost of living is still relatively inexpensive here, which I think is a factor of why the homes are selling at the price range that they are," Clifton said.

Thirty percent of homes sold in May were priced from $100,000 to $159,999.

An association press release said the data show a clear indication of location and price in Tucson's real estate market, pointing to declining sales for May in Marana, Oro Valley and Sahuarita.