i suspect that's really about average town size. not mean average of course, because the few huge cities that most people live in skew it upward. but median and mode average anyway. the county i live in, for example, has one town of 15,000 and one town of 6,500. then there's 7 towns in the 500-2,500 range, and about 30 small communities of under 500. so even though most of the population is in the bigger cities, most towns are actually pretty small.