Search new-to-market homes for sale in Round Rock, TX, a city located in Williamson County. These listings are updated daily from the MLS. For more info about any of these Round Rock real estate listings, click the "Request More Information" button located on the detail page of each property. And, register for a free account to automatically receive email alerts whenever new listings hit the Round Rock market that match your specific search criteria and save your favorite properties for quick access.