barrington countryside fpd - serves 3 counties

https://www.bcfpd.org/about/

illinois

apparently they are the fire department having first response duty in 3 counties

the fire department having responsibility

the fire department having jurisdiction

we dont quite have the word or phrase or expression that covers this concept

primary response area - first due area - primary jurisdiction -
response area - response neighborhood (even though rand corp used that
term differently in nyc iirc)