Zillow.com and Howard Hanna Real Estate Services today announced a partnership that enables Howard Hanna to automatically feed all of its 21,000 for-sale listings to Zillow. The syndication of Howard Hanna’s listings to Zillow will improve the real estate search experience for Zillow users in Pennsylvania, Ohio, West Virginia and New York. Howard Hanna joins more than eight hundred partners participating in the Zillow listings feed program, which launched in November 2007 and has grown to more than four million for-sale listings and over 65,000 rental listings today. The program allows listing providers to automatically receive free marketing exposure for their listings on one of the most-visited real estate sites in the country while providing Zillow’s users with a more robust search experience.