In The Handbook of British Honduras 1888-89 it is stated that S. Castillo was appointed as Deputy Registrar for San Antonio in 1887.[1]
San Antonio is often referred to as San Antonio Rio Hondo to differentiate from other San Antonio's in Belize as seen in multiple documents such as the 1980 census.[2]
In 1949 the police force consisted of 1 officer.[3]