According to the
2022 Bangladeshi census, Lalmonirhat Sadar Upazila had 91,859 households and a population of 373,470. 9.12% of the population were under 5 years of age. Lalmonirhat Sadar had a literacy rate (age 7 and over) of 69.11%: 72.82% for males and 65.46% for females, and a sex ratio of 99.11 males for every 100 females. 91,371 (24.47%) lived in urban areas. According to the
2011 Census of Bangladesh, Lalmonirhat Sadar Upazila had 79,147 households and a population of 333,166. 78,228 (23.48%) were under 10 years of age. Lalmonirhat Sadar had a literacy rate (age 7 and over) of 47.37%, compared to the national average of 51.8%, and a sex ratio of 998 females per 1000 males. 60,322 (18.11%) lived in urban areas. As of the
1991 Bangladesh census, Lalmonirhat Sadar has a population of 260876. Males constitute are 51.52% of the population, and females 48.48%. This Upazila's eighteen up population is 131281. Lalmonirhat Sadar has an average literacy rate of 27.7% (7+ years), and the national average of 32.4% literate. ==Administration==