Hi RS - none of them know I am married. That is correct.
I would flip the question around and ask you in return - what is the benefit to you if they know you are married?
I concur. I'd prefer to keep that private as much as practical (or maybe not as heianth pointed out). Without engaging with a SB (..yet) I just assume it'll be a challenge to conceal especially as the relationship with the SB progress overtime.