A 2001 Census Area Statistic (CAS) ward is one of 2 special wards created for 2001 Census Output. These are both created by aggregating output areas and are only best-fit for electoral wards.
Using master postcodes, OAs are assigned to electoral wards. The resulting 1,222 aggregations are denoted CAS wards and will fall within a council area boundary and meet a threshold of 20 households and 50 persons.
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