The Region is comprised of Lake, Porter, LaPorte, Newton, and Jasper counties. Although, I think that Lake and Porter are the ones that are thought of moreso than the others since they are closer. The population of Portage is actually closer to 40,000 now (around 38,000, I believe) and seems to be one of the fastest growing communities in the region with many moving from the Chicago, Illinois area to live here instead.
Portage is thriving and having lived here for over 30 years (I'm 34), I feel it is better than it ever has been. It's been a little hard getting used to having so many more people, but I'm excited to see all the new business, restaurants, and shopping coming in. Our new 16 theater Imax is nice too! LOL!
That said, it is less than an hour to get into downtown Chicago by train and that is really nice. Plus, the beaches in the summer and the outlet mall and marina in nearby Michigan City is great too. And then on the other side, you have Merrillville with Westfield Mall and lots of other happenings less than 20 minutes away.