Alpena is a city located in South Dakota. With a 2020 population of 294, it is the 156th largest city in South Dakota and the 15393rd largest city in the United States. Alpena is currently growing at a rate of 1.38% annually and its population has increased by 2.80% since the most recent census, which recorded a population of 286 in 2010. Spanning over 2 miles, Alpena has a population density of 180 people per square mile.
The average household income in Alpena is $93,255 with a poverty rate of 4.79%. The median rental costs in recent years comes to $721 per month, and the median house value is $55,600. The median age in Alpena is 51.6 years, 47.3 years for males, and 54.7 years for females. For every 100 females there are 100.6 males.