[9] San Felipe sold part of its original 22,000-acre (8,900 ha) township to the Gulf, Colorado and Santa Fe Railroad to create Sealy in 1879.

In 1881, Daniel Haynes, a cotton gin builder, filled a request for a cotton-filled mattress which started a company.

Business grew exponentially, which led to more innovation and several patents, such as a machine that compressed cotton.

[11] As of the 2020 United States census, there were 6,839 people, 2,524 households, and 1,921 families residing in the city.

Blinn College has a Sealy Campus located along Interstate 10, east of State Highway 36.

[15] The Greyhound Bus Lines operates the Sealy Station at Mazac Muffler City AC.