The phrase "home borough" is correct and usable in written English.
You can use it to refer to someone's area of origin or the place where they live. For example, "He was born in the Bronx, his home borough."
More than 80 percent of Manhattanites live and work in their home borough.
His home borough, the precious to the point of overly precious Brooklyn, is a winner, too.
In the Miliband family's home borough of Islington, Labour represents 47 of the 48 wards.
Over 17,000 of those 50,970 households have ended up living outside their home borough.
And they all had relatives in my home borough of Queens.
The Bronx, Yankee Stadium's home borough, was conspicuously underserved by All-Star events.
Where has she been while her own home borough has slid into such a shameful condition?
The larger and longer New York festival also has retrospective screenings outside its home borough.
Even the Mets pulled 3percentt from the Yankees' home borough.
Their club never did find a ground to play on in their home borough of Merton.
Deba is nearing the Bronx, her home borough, where she should get a huge reception of cheers.
