According to the United States Census Bureau, the city has a total area of 8.6 square miles (22 km2), of which, 8.6 square miles (22 km2) of it is land and 0.12% is water. Webster City is a city in Hamilton County, Iowa, United States. It is the county seat of Hamilton County. Webster City is known as 'Boone River Country' with the Boone River meandering along the east side of the city from north to south. Webster City is home to several large companies that have global reach, including Vantec, Inc., Van Diest Supply Company, McMurray Hatchery, Webster City Custom Meats, Mary Ann's Specialty Foods, and Seneca Foundry. The city, which serves as the county seat, has no courthouse square.