According to the
2022 Bangladeshi census, Kalia Upazila had 59,436 households and a population of 243,166. 10.52% were under 5 years of age. Kalia had a literacy rate of 73.17%: 74.46% for males and 71.93% for females, with a sex ratio of 97.32 males per 100 females. 51,328 (21.11%) lived in urban areas. Ethnic population was 3,051 (1.25%), of which 2,020 are Malo. As of the
2011 Census of Bangladesh, Kalia upazila had 48,579 households and a population of 220,202. 54,831 (24.90%) were under 10 years of age. Kalia had an average literacy rate of 55.25%, compared to the national average of 51.8%, and a sex ratio of 1019 females per 1000 males. 35,744 (16.23%) of the population lived in urban areas. ==Administration==