2014 Popultation: 619,360
Growth Rate (from 2010): +6.10%
Here’s a city that actually already has a plan to build a baseball-only stadium in place! That’s something none of the other cities on this list can claim. Portland wants baseball, and has an outstanding sports culture. There’s Nike, the Portland Trailblazers, and the Portland Timbers. The Blazers and the Timbers have rabid fanbases. Portland’s market is growing and the city is about three hours away from Seattle and the Mariners. Portland would serve as a nice midpoint between San Francisco and Northern California and Seattle. Portland has the reputation for being a rainy place to live, but very little of that rain actually comes in the summer. Beautiful weather all summer, outdoorsy, athletic people, and an overall slightly irrational love for everything associated with the city by its residents could make Portland a very attractive place for Major League Baseball.
The only downside to the city is its slightly limited metropolitan area. The surrounding regions are sparsely populated. The Mariners would also likely fight the addition of a team only three hours south of their home. The City of Portland itself might want baseball more than baseball wants Portland.