Booster does fall into the hypernym category, but it collocates with cities and municipalities. If you don't find a single word, perhaps city-booster.
One that boosts: such as an enthusiastic supporter
A person who enthusiastically supports or promotes something (=
tells people how good it is):
I don't want to come across as a booster for any particular product.
The mayor and town boosters hope the new ballpark will be a catalyst for development. Cambridge
A booster is someone who supports a sports team, organization,
person, or place very enthusiastically.
In the local newspaper, the Corona Daily Independent, city
boosters boasted that great golf tournaments held at the Parkridge
would accrue national and international recognition for their citrus
belt community and generate publicity benefits that would attract
Alison Jefferson; Living the California Dream (2020)
On the general brokers side, the typical realtor was an enthusiastic
booster of urban planning and land-use regulation, mostly beginning around 1914 and particularly during the early 1020s.
Weiss; The Rise of the Community Builders (2002)
The River and Harbor Convention was a classic city-boosting event. Chicago boosters inserted into the convention's printed proceedings a twenty-page statistical appendix that celebrated the city's development.
... The city's boosters had lobbied strenuously to convince
eastern organizers to choose Chicago for the convention site.
Einhorn; Property Rules: Political Economy in Chicago, 1833-1872