Only practicing catholic men and their wives are admitted. Membership spans all cadres of professionals such as Government Administrative Officers, Teachers, Lawyers, Businessmen, Professors, Engineers, Bankers, Doctors and other professionals in all strata of the economy.
The Order has grown in strength over the years from the two (2) sub councils in 1953 to six (6) sub councils in 1960 when Fr. Ojefua handed over to Bro. Robert O. Olisa as the 2nd Supreme Knight. Under Bro Olisa, the number doubled to twelve (12).
Under the leadership of Bro. Da Silva, the Order’s sub councils increased to eighteen (18) and the Ladies of St. Mulumba came on board.
The Mulumba Assurance Company was incorporated in 1985 under Supreme Knight George C. Akabogu. KSM Nigeria became a member of the International Alliance of Catholic Knights (IACK) and Bro. Akabogu was elected as its President from 1989 to 1990.
In 1988, KSM Nigeria also became a member of the International Council of Catholic Men (Unum Omnes).
The same year the number of Sub councils rose to fifty-five (55). This growth in membership and sub councils continued during the tenure of Bro. Christopher Abebe (1996 – 2000). Bro. Abebe handed over a membership of 5,102 and 82 sub councils which under the leadership of Bro. Fidelis R. C. Ezemenari, grew in leaps and bounds to 18,000 (8994 Knights and 9,000 Ladies) across 162 sub councils in 2008.
From 2012 till date, under the administration of Bro. Anthony C. Onuh, the population has further increased to 20,000 (about 11,000 knights and over 9,800 Ladies) in 217 sub councils.