Varies by state.
In Ohio, last call is 2:00 a.m., though it used to be that a bar could pay for an extra license to stay open until 2:30 a.m. -- not sure if that's still a thing or not. I never played in a bar that was serving until 2:30 -- 2:00 in Ohio was always last call. Same for CA and most other states (NY is 4 a.m.)
Well then I guess it's a goddamn shame you never played in NY. I'd love to hear your opinion about women who are at the bar at 4am. Also, Flagpole, if I go out with a group of friends (some being women), and we all leave together at 2 or 4am, are the women still chickenheads, as you seem to imply?