alpena,_michigan | country | united_states <sep> alpena ( al-pee-nə) is a city in the us state of michigan it is the county seat of alpena county, and is the only city within the county the population was 10,197 at the 2020 census, making it the third most populated city in the northern michigan region, after traverse city and cadillac the city is surrounded by alpena township, but the two are administered autonomously 
alpena. michigan is located in the united states.no information