Collocations for constituency - noun

important, key
home (AmE), local
marginal (BrE)
The Tories are concentrating their campaign in the key marginal constituencies.

target
electoral, parliamentary (BrE), senatorial (AmE)
inner-city, urban
suburban
county, rural

represent
He represents a constituency in the north of England.

boundaries
MP (BrE)

in a/the constituency
the people in this constituency

broad, wider
core, key, natural, traditional
These people are the party's natural constituency.

important, powerful (esp. AmE)
domestic, political, religious (esp. AmE)
Democratic, Republican, etc. (AmE)
African-American voters are a key Democratic constituency.

appeal to, represent
The party needs to appeal to a broader constituency.

build, create (both esp. AmE)
alienate (esp. AmE)
This position risks alienating an important constituency.

in a/the constituency