Do most freemasons belong to the Republican Party?

First of all, Freemasonry is a global organization, so your question is implicitly limited to American Freemasonry. There are no statistics available upon which to base an answer to that question. The Masonic fraternities themselves are non-political as a rule. The discussion of politics and religion are forbidden within a Masonic temple. The specific political or religious persuasions of any member is their own private business. Within any Masonic lodge however, you are sure to find a diverse group of individuals of many different political parties, ethnic backgrounds, religions, etc. I personally know of Freemasons who are Rebuplican, Democrat, Libertarian, Catholic, Lutheran, Presbyterian, Jewish, Buddhist, Wiccan, of European descent, African, South American, Indian, Pakistani, Chinese, etc. etc. It would definitely be a mistake to assume that there is Republican majority in American Freemasonry.

A previous answer to this question said that Freemasons are probably members of the KKK, which is an outrageous, absurd and ignorant accusation. For one thing there are thousands of African-American Freemasons, not to mention many more tens of thousands of non-white Masons throughout the world.