In 2020, 16.5% of the population of Akaa was under the age of 15, 59.3% were aged 15 to 64, and 24.2% were over the age of 65. The average age was 44.6, over the national average of 43.4 and regional average of 42.8. Speakers of
Finnish made up 97.4% of the population and speakers of
Swedish made up 0.2%, while the share of speakers of foreign languages was 2.4%. Foreign nationals made up 1.8% of the total population. The chart below, describing the development of the total population of Akaa from 1975 to 2020, encompasses the municipality's area as of 2021.
Urban areas in
Kylmäkoski In 2019, out of the total population of 16,475, 14,323 people lived in
urban areas and 1,995 in sparsely populated areas, while the coordinates of 157 people were unknown. This made Akaa's degree of urbanization 87.8%. The urban population in the municipality was divided between four urban areas as follows: == Notable people ==