Hi! If you don't yet have the clients in place to create this type of content, then you don't really yet have a reason to create it. While you're building up your client base in the other cities, some other ideas might be finding opportunities to network in these other cities. Perhaps attending Chamber of Commerce meetings, hosting or attending workshops in these other cities or finding other opportunities for building relationships within these communities that you can then write about. Until then, your pages would by necessity be blank and you don't want blank pages on your site.
If you're talking about a retail business, it's the same thing. The fact that customers in cities B, C and D drive to city A to shop isn't really a compelling reason to develop content. Your other customers will not be interested in this. You have to discover whether you have some more real/interesting connection between the business and the other communities. For example a retail toy store might host a gaming event in city B, sponsor a little league team in city C, etc. Finding ways to become locally involved where your customers live builds relationships that you can then showcase on your website/blog.