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 through which runoff from inland fields drain to the bay. The piece of land was purchased by Seabrook W. Sydnor in 1895. In March 1903, the Seabrook Company of Houston created a layout of the proposed Seabrook Town site. The new town attracted fishermen, merchants and even a few residents.
The Galveston Hurricane of 1900 demolished the local school, but by 1905 it was restored and was run by three teachers who taught 100 students. The local schools became part of the Clear Creek Independent School District in 1947. The population of Seabrook rose from 200 to 560 before the Great Depression, but fell to 200 in 1936, and remained at 400 from 1940 until 1947, when the Albert and Ernest Fay shipyard opened. It could handle 150 boats, and opened up jobs and is the main cause of the population increase. Despite damage from Hurricane Carla, a bridge linking Seabrook and Kemah was completed in 1961. With the opening of the bridge and the Johnson Space Center (JSC) in Houston, Seabrook's population rose to approximately 6,000.
In 1986, the decision was made to start the construction of a fixed-span bridge that was tall enough for sailboats to pass under. After this bridge was finished, Highway 146 was linked all the way from Galveston to Texas State Highway 225. This spurred a further increase in the population of Seabrook to its present level of nearly 12,000 people. Seabrook's residents are quite diversified and are employed in a variety of professional positions. Quite a few residents have ties to the chemical and oil industry as well as the NASA space program.