constituency
US /kənˈstɪtʃ.u.ən.si/
UK /kənˈstɪtʃ.u.ən.si/

1.
a body of voters in a specified area who elect a representative to a legislative body
:
•
The candidate visited every town in his constituency.
•
She represents a diverse constituency.
2.
a body of customers or supporters
:
•
The restaurant has a loyal constituency of regulars.
•
The politician worked hard to build a strong constituency among young voters.