Membership in the Knights of Columbus is open to practicing Catholic men who are at least 18 years old. Blank applications (known as Form 100s) are available from any member of the Knights of Columbus, and also available at the information counter in the vestibule of the Church. 

Here is a link to the Knights.net, if you are interested in learning more about joining the Knights of Columbus. It has a lot of information about joining, and it is extremely easy to do so, even as an online member (or E-member) now. If you wish to join as an E-member, here is a link to do so. 

What is a practicing Catholic? Also known as being in union with the Holy See, this is someone who actively lives out their faith, is active in their church community, regularly receives the sacraments (including Eucharist through regular weekly attendance at Mass and at least annual reception of Reconciliation during the Easter Season). A practicing Catholic is someone who takes seriously the commitment of living out, through their actions and lifestyle, the Commandments of God and the precepts and teachings of the Church. A practicing Catholic, in short, is someone who is an example to others of what it means to live their faith.