It was formed in 1816 from parts of York County in the Home District and parts of the Niagara District.
The district town was Hamilton.
Two new counties were created: In 1838, parts of Halton County and parts of Home and Huron Districts were separated to form a new Wellington District.
In 1849, the district was replaced by the United Counties of Wentworth and Halton, which were separated again in 1854.
This Ontario geographical article about a location in the Golden Horseshoe is a stub.