Portland, MainePortland, on the other hand, is very populous and popular. In fact, Portland is the largest city in Maine with a population of 66,194 (as of 2010 Census). And its population has been increasing at a rate of 3 percent since the census of 2000. This Avia fitness tracker features over the air updates. You can wear it as a watch or wear it discreetly as a belt clip. Whether you decide to workout at home, at the park,…