A 2001 Standard (ST) sector is one of 2 special postcode sectors created for 2001 Census Output.
A postcode sector comprises all the unit postcodes that have the same identifier except for the last two characters. Special postcode sectors are created for census output to ensure sectors conform to a minimum threshold and do not cross Council Area boundaries. ST sectors have a minimum threshold of 400 households and 100 persons. There are 859 ST sectors.
