How To Boost Maps Ranking For City Specific Keywords?

In episode 105 of our weekly Hump Day Hangouts, one participant asked how one can boost the maps rankings for city-specific keywords.

The exact question was:

Hi guys, hope you’re having fun!

Q about ranking maps. I am in Tampa Bay, with 3 large cities in a 25 mile radius. A local client is showing in the maps for a few kw, but only for the kw, not with a city modifier. What do I need to focus on to get him in the maps for kw city, even if it’s just for Tampa? It’s a service biz with a brick and mortar location in a small town just outside Tampa (so it’s not a Tampa address), showing a service area instead of the address. Service area includes the 3 cities. Cities are in the schema description and on the website.