As a kid my state didn't permit or sell projectile type fireworks to the public. Just fountain, snakes, sparklers, etc. But that didn't stop us, or anyone, from just driving into the next state over to get the good stuff then come on back to where they were illegal to fire them off.

Some places, despite any potential law, don't care one way or another. Where I grew up no one cared so long as you didn't cause a fire. That was rural though. In general those areas operate differently.

Where I live now is a suburb. I could get away with doing some fireworks on a non-holiday but doing too much of a display or too frequently and I would likely run into issues. Though doesn't stop some people.