How many estimated people have homophobia?

First of all, this "guesstimate" is for the United States. Second, we have to be careful how we define "homophobia." A phobia is an irrational fear, so homophobia is an irrational fear of homosexuality. Some people don't like homosexuals because they haven't met one, or because someone has told them things that aren't true. So these people do not technically have homophobia.

Probably somewhere around 50% of people are ignorant or deceived about homosexuals. But I would guess that no more than one person out of five (20%) has an irrational fear of homosexuals.