Seabrook is a city in Harris County, with some water surface area located within Chambers County in the U.S. state of Texas. The population was 9,443 at the 2000 census. Seabrook is known for its fish markets on Waterfront Drive where resident shrimpers and fishermen bring in their catches daily. Besides bordering the bay, the city encompasses marshes though which runoff from inland fields drain to the bay. There are eight miles (13km) of continuous trails from Hammer Street to Galveston Bay at Pine Gully Park, where the Lucky Trails Marathon is run in March. Seabrook is also host to the Texas Concours d'Elegance "Keels & Wheels" classic car and boat show held each year the first weekend in May at Lakewood Yacht Club.