Kirk's birthplace isn't established in canon.
That he lived in Iowa, probably for a long time as a child, is indicated by one line in "Star Trek IV:" "No, I'm from Iowa. I only work in outer space."
Now, I was born in the District of Columbia. My parents moved elsewhere when I was six months old (I managed to track them down. Hah!). I'm sure many other people have the same experience: if asked specifically to provide my place of birth I respond "Washington DC" but if asked "where I'm from" I answer with the name of the state where I spent my entire childhood and most of my life since.
That he lived in Iowa, probably for a long time as a child, is indicated by one line in "Star Trek IV:" "No, I'm from Iowa. I only work in outer space."
Now, I was born in the District of Columbia. My parents moved elsewhere when I was six months old (I managed to track them down. Hah!). I'm sure many other people have the same experience: if asked specifically to provide my place of birth I respond "Washington DC" but if asked "where I'm from" I answer with the name of the state where I spent my entire childhood and most of my life since.