- Does your site include a requirement to specify your gender? Consider whether or not you actually need that. You probably don't. If you do, add an "other/none/decline to say" option for non-binary, trans people and people who just don't want to identify or share their gender. Treat it a bit like Facebook's "it's complicated" option. Don't press the issue.
- I know it's difficult to contemplate, but there are people outside of the United States. We tend to not have zip codes or live in states.