No all northern cities follow the NYC formula for the most part. I remember a Chicago dude on CNN laughing at a dude who was claiming Chicago but was from a suburb right outside of it.
He was trying to clown someone from Evanston. You can’t really clown someone from Evanston though.
Chicago has over 300 suburbs and the collective area is called Chicagoland. So suburbanites will say they from Chicago when talking to people out of town. When talking to people in the area, you can be more specific.
It’s can be a bit more complicated with black folks though, especially those living in the suburbs, because most of their families lived in Chicago for generations, and just moved to the burbs within the past 25-30 years. If all your people still in the city (95% of them are), you grew up still going in an out of the city, I don’t really care if you still claim Chicago. All of our families are from there.
Atlanta is different though because it’s a city of transplant. Especially for black people. New York is different because you have a lot of immigrants. Chicago isn’t a black transplant or immigrant city. 99% of the black people there, their families have been in the city for generations and if they left for the burbs within the past 25-30 years, they grew up going back and forth into the city.
For instance me, we had a suburban house, but also had a condo downtown that we went to on the weekends. I say I’m a suburbanite but I can technically say I’m from the city as well. Lots of folks have both city and suburban houses.
Also depends on how long your family been in the city. A person whose family came to the city during the great migration telling a suburban person whose family came to the city before the great migration, that they not from Chicago, can stfu.