Are you including the cities in your page titles and page descriptions? Do you mention the cities in your content body?
Page Title: Company | adjective product servicing city A & city B
maybe a sub-page for city A and a sub-page for city B
anchor text and links to the main page which will carry some juice to the sub-pages.
Link building strategy county-wide to the main page, link building city specific to the sub-pages.
I'm not super experienced so take my advice cautiously.