Keetmanshoop was the next to secede in 1924, but even after that separation, Mariental still covered an area as large as the entire Orange Free State.
Three more congregations seceded in quick succession from 1944 onward: Leonard (1944), Maltahöhe (1946), and Gochas (1950).
Even after all this, there were still five additional districts where the congregation held services outside of Mariental proper.
The name Gibeon derives from a small village that eventually became a suburb of Mariental.
Gibeon was the first congregation of the NGK in SWA to do missionary work among the Cape Colored who had emigrated there from the Union of South Africa.