Usage patterns
〈場所〉区に住むto live in ~ ward
He lives in Shibuya Ward.
選挙区で当選するto be elected in a district
He was elected in this electoral district.
区役所に行くto go to the ward office
I went to the ward office and got a residence certificate.
〈場所〉を区に分けるto divide ~ into districts
The city divided the town into several districts.
Expressions
区別がつくtell apart; distinguish; know the difference 区別をつけるdistinguish between; tell the difference between