Clayton, California is located in Contra Costa County. Below is a market update video for Contra Costa County. For detailed market report of your neighborhood, please contact us. City of Clayton. Our city is a very special place, with exceptional people who have a deep appreciation for the community's history, tradition and volunteerism. Clayton is a safe residential community of around 11,288 people. It is a town which values civic partnership with business leaders, community leaders, and our neighbors. Claytonians turn out in high numbers to celebrate the annual family-friendly festivities such as the Art and Wine Festival, our homespun 4th of July Parade, the annual Rib Cook-off, the Oktoberfest celebration, and our ever popular Concerts in The Grove summer series on select Saturdays and Thursdays in the beautiful Downtown Park. Canines and their owners even enjoy the outdoor air at our off-leash Clayton Dog park on east Marsh Creek Road. In Clayton, everyone is family. And families are most important. Clayton is simply a great place to live, work and play for people who cherish small-town living and traditional American values. Outdoor bocce courts in the Clayton Town Center will find friends and families vying for social interaction and first place. In this community, crime is low and police are respected. High-quality public and private schools are plentiful. Trails for pedestrians, equestrians and bicyclists meander through the City connecting one with another. Understandably, Clayton has been listed three times running as one of CNN's Money Magazines "Top 100 Places to Live in the Nation" for small cities. Whether you're a first-time visitor to our city, long-time resident, or are considering moving here to reside, raise a family or open a business, we want you to know we are here to help make your stay the highest quality of life one can enjoy.