Alpena Township is a civil township located in the U.S. state of Michigan. It is within Alpena County. It has a total area of 141.2 square miles at 45°5′5″N 83°26′23″W. The elevation is 627 feet above sea level. As of the 2010 census data, it had a total population of 9,060. The population density was 87/sq mi. Recent job growth is negatively decreased by 1.93 percent. The average travel time is 16 minutes. It has Zip code 49707.