What is a service area page?
A service-area page is a dedicated page about a specific location that a business services, but does not have a physical office in.
For example, if you are a local business you should have a dedicated page for each service-area that you travel to for work. This gives the site the opportunity to rank for all the locations that they provide services in.
Read this guide for more in-depth details: https://contentamigo.com/articles/service-area-page-examples-best-practices-must-have-elements/