Source: Statistics South Africa (web) / adrianfrith.com.
The above population figures are derived from sub places (2011 definition) that are completely or mostly urban.
The 2001 and 2011 figures are not completely comparable because of boundary differences between the sub places of 2001 and 2011.
Some densely populated areas have been classified as "traditional" (and not as "urban") by Statistics South Africa and therefore are not considered here.
The aggregation of the sub places to "reasonable" urban areas was done by »City Population«.