We don't know exactly how many people live in this city, but a 'ballpark' figure/estimate would be about two million.
An offer of $5,000 would be 'in the' (right) 'ballpark' for this car. [=this car is worth about $5,000]
My first guess wasn't even 'in the ballpark'. [=it was not close to being correct]
(..) I'm gonna brush my teeth. No, wait a minute now! Come on, it's your turn. Oh, come on! You know, I don't need the actual number. Just a ballpark. Okay, it is definitely less than a ballpark. I am so glad I'm not Monica right now. Tell me about it. (..)1996 TvShow: Friends Title: The One Where Dr. Ramoray Dies Season: 2 Episode 18