Postal code on GMB

I wan to get serp GMB results in all the state. "Car repearing alaska"

But my main clients (85%) comes from 5 postal codes areas.

Should I add in GMB all the postal codes of Alaska, or just the 5 postal codes where 85% of my clients are from?

Thanks

I would put the postal codes that are nearest your business in alaska, or you have multiple car repairing workshops?

I have multiple car repearing carshops, but they are in "side by side" postal code. In other words, the towns beside

lets say nd I also rent cars, clients from Washinton and canada when they arrive to Alaska for hollidays, wants to rent these cars..

Thats why is important is also important to serp alaska.
There are clients that knows exactly where they are staying, so they search exactly for a zip code or city.

A client that is staying for hollidays 200 miles away from our service is not a client.

But there are clients that stay for hollidays closer than 200 miles that instead of searching for the exact city or zip code, they search for the state. That's a client.

What should I do?

Also, just imagine I rent bikes.

Clients may want to move with car to my postalcode, becouse the views in my postal code are much more beatiful than in other area.

Anyway, 200 miles is not a client

As for me, you need to understand, which of these 5 postal codes are exactly your 85% of clients? If you'll look at any zip code finder, like https://worldpostalcode.com for example, there are 27 regions in Alaska with about 5-10 postal code in each one. So it will be difficult to get results from all of them.

I would suggest to make 50 listings and optimize them all and not only GMB but create social media pages also for these listings and get them listed in local directories so that all seems genuine.