Castro Valley is a suburb outside of the Hayward area and is located in Alameda County, in North California. Many come to Castro Valley to find a stunning house for rent, or a middle class rental home that is situated in a family oriented neighborhood. Those that like this area also tend to check out Hayward home rentals which are nice as well. Castro Valley has very unique rental houses that many find simply charming. The town is picturesque and the locale is convenient. The scenic landscaping of the area is a perfect backdrop to this residential wonderland.