...In 1785, seven newly-defined "counties" were created wholly within the existing Camden District - Chester, Claremont, Clarendon, Fairfield, Lancaster, Richland, and York - but, the overarching Camden District remained intact. The town of Camden was always its district seat.
In 1800, South Carolina abolished all "overarching Districts" and essentially went with the county concept from that year forward. However, in 1800, all counties were now called "districts" and would continue being called districts until after the US Civil War. In 1868, South Carolina reverted back to the term "county" and this term has been used continuously since then.
Sources: SC GenWeb Project at http://www.rootsweb.ancestry.com/~scoldcam/ and Carolina at http://www.carolana.com/SC/Counties/camden_district_sc.html