The US population increased by 61%, from 205 to 330 million. Indiana population increased by 30%, from 5.2 to 6.8 million. Indiana added nearly 1.6 million people during these 5 decades. It would have added another 1.6 million if it grew as fast as the US average. Indy Metro Area Grew by a Strong 72%. … Continue reading Indiana Population Grew Half as Fast as the US from 1970-2020.