Hi Alan!
Good question! Provided that each physical location has its own local phone number, then citation building (the practice of building listings on local business directories) is almost certainly going to be an appropriate part of your marketing strategy. When dealing with 200 locations, the use of tools and services that can automate at least some of the process for you will be a tremendous time-saver.
Moz Local is one such service. In order to use this service, you will need to have either a unique Google+ Local page or Facebook Place page for each of the physical locations, already in place. As Ray-pp has mentioned, you should take advantage of Google's bulk upload, which allows you to create a .CSV of all listings and upload them all at once, rather than building 200 individual listings by hand. The good news is, if your Google .CSV is formatted properly, you can also use it in our system So, you'd want to get the Google listings in good order and then, once they are live and verified, upload the same .CSV to Moz Local. This will likely save you a tremendous amount of time in getting the listings pushed out to our 7 supported partner sites, which are some of the most important local data sources on the web.
Hope this helps!