Although it's hard to predict what the future will hold, we've come up with a list of 15
To compile this list we looked at job growth, population growth and demographics, affordability, livability, and the health and well being of the residents.
We also considered how the city is innovating in terms of technology, sustainability, culture, and more. And we thought about how "cool" the city is--an important factor in attracting the young, creative types who will make the city hot.
We looked at how the next generation will influence the city--whether they're hipsters, tech-savvy pros, artists, or environmentalists. The cities that made this list vary greatly, but they all have one thing in common: great people and great ideas.
Click here to see the cities >
MORE: 'Where Will Americans Be Living In 20 Years?' at The Great Debate →