Zip Realty, the Emeryville, Calif. online real esate brokerage with local offices, reported Monday that home listings in the 28 metro markets in which it operates declined for the 15th consecutive month in July.

The combined total number of single family homes and condos listed for sale according to Multiple Listing Service (MLS) data decreased in July by 2.5 percent compared to June, bringing the total number of active listings in 28 major U.S. markets to 679,748.

Additionally, Zip tracked a year-over-year decrease in housing inventory of 28.5%. Factors such as declining inventory and strong activity from buyers may be contributing to rising asking prices, with the median list price increasing nationally last month and agents in California reporting an increase in the number of homes receiving multiple offers in several markets, Zip said.

Among its markets, Austin reported 9,149 lisings, down 10.5% from June and down 17.4% from last July. Among other markets, respectively, Bakersfield had 6,261, down 2.5% and 57.2%; Baltimore had 9,473, -1.3% and -9.9%; Boston had 34,997, -4.4% and -7.8%; Charlotte had 20,395,-1.7% and-8.3%; Chicago had 73,860, -1% and -14.6%; Dallas-Ft. Worth had 37,149, -0.2% and -11.4%; Denver had 18,583, -1% and -14.6%; Houston had 29,347, +0.7% and -20.2%; Jacksonville had 11,168, +0.6% and -18.1%; Las Vegas had 13,103, -6.5% and -43.1%; Los Angeles had 41,669, -5.3% and -55.3%; Miami had 53,311, -4.7% and -34.6%; Minneapolis-St. Paul had 23,585, -1.7% and -21.7%; Norfolk/Virginia Beach had 11,873, +0.5% and -3%; Orange County had 8,528, -4.2% and -43.3%; Orlando had 23,417, -4.7% and -30.2%; Philadelphia had 35,886, -1.7% and -5.3%; Phoenix had 29,962, -2.9% and -44%; Raleigh/Durham had 15,421, -1.7% and -7.3%; Richmond had 9,101, -.3% and -5.4%; Salt Lake City had 16,732, -0.3% and -12.6%; San Francisco Bay Area had 18,586, -4.1% and -46.9%; Sacramento had 15,501, -0.1% and -34%; Seattle had 32,707, +0.3% and -18.8%; Tampa had 40,120, -2.9% and -24.7%; Tucson had 5,476, -3.8% and -23.5%; and Washington, D.C. had 34,388, -3.7% and -32.3%.

Learn more about markets featured in this article: Los Angeles, CA, San Francisco, CA.