Cape of Good Hope (Colony). Colonial Office. Census of the Colony of the Cape of Good Hope, 1865 / Cape Town, Saul Solomon, 1866. Parliament. Annexures to the Votes and proceedings, 1866. G 682 E1
Cape of Good Hope (Colony). Colonial Secretary's Office Results of a census of the Colony of the Cape of Good Hope, taken on the night of Sunday, the 7th March, 1875. Cape Town : Saul Solomon, 1877-1878. Appendix I, vol. 2 of 1877 with 3 supplementary vols. in a box. G 682 E5
Cape of Good Hope (Colony). Census Office. Results of a census of the Colony of the Cape of Good Hope, as on the night of Sunday, the 5th April, 1891. Cape Town, W.A. Richards & Sons, Government Printers, 1892. G 682 A.POPU.1891.RESU
Cape of Good Hope (Colony). Census Office. Results of a census of the Colony of the Cape of Good Hope, as on the night of Sunday, the 17th April, 1904. Cape Town, Cape Times, Govt. Printers, 1905. G 682 A.POPU.04.RESU
Great Britain. South Africa. Census returns of British South Africa. London : H.M.S.O., 1904. G 42 E3 Cd. 2103 (In U.K. Parliamentary Papers database.)
LSE Digital Library has the Cape of Good Hope Colony Census reports for 1865, 1875, 1891, and the Preliminary report for 1904.