That's going to be a moving target for sure and no such map exists. Account ownership does tend to change and evolve, sometimes accounts are handed off to different sales reps, and with the way Meraki is growing, sometimes regions get split, plus new sales reps are coming in frequently, and territories & accounts sometimes get divided. There's also a difference between "inside" accounts and "field" accounts, which map back to different reps based on things like total enrollment in a school district or university, or the population of a city. One way to find out could be just asking your local Meraki rep (or partner rep) if you have one, and if not, you could fill out the "Contact Us" form https://meraki.cisco.com/form/contact to have your rep contact you, (which can/should also happen if you attend a webinar) and if you're already a Meraki customer you could probably also call Support and ask them to have the sales rep for whatever city to contact you.
HTH,
Dave