Best way to organize service area pages for local businesses

(Website nhà tài trợ: https://baohiemlienviet.com/bao-hiem-nhan-tho-daiichi-viet-nam-an-tam-hung-thinh-toan-dien)
I've been working around local service business websites recently and noticed that service area pages can either help local visibility a lot or create duplicate/thin content problems if they are not organized properly.

A few things that seem to work well:

- Creating unique content for each city/service area
- Adding local details instead of copying the same text everywhere
- Including real service examples or project types
- Keeping navigation simple and organized by region
- Using clear internal linking between related areas
- Adding FAQs related to that specific location
- Embedding maps and keeping contact details consistent

For local businesses with multiple locations, organizing these pages correctly can improve both user experience and local search visibility.

How do you usually structure service area pages for scalability without creating duplicate content issues?