It's generally considered pretty rude to ask about income in America. My wife knows how much I make, of course. I told my parents what the pay was when I got my first career-job almost 10 years ago.

I've got vague impressions about some family members, friends, and coworkers, but nothing solid (unless I wanted to look up the pay scales for the few with government jobs, I guess). I could probably get accurate answers from close friends if I "needed" to, but it would be an uncomfortable conversation.