At the end of 19th century, the workers of the Bengal Duras Railway (BDR) while digging the mud for the installation of rail line, found a red color stone and since then, the place was recognized as Lalmoni.

Whereas some legendary opinions that the railway which acquire the land owned by a lady named Lalmoni for which people kept the place after her name as the recognition of her contribution of land for the rail line.

Others are of the opinion that in 1783, a woman named Lalmoni along with peasant leader, Nuruldin fought against the English soldiers and land lords for the cause to establish the interest of general peasants and laid down her life against the atrocity of the rulers.

[3] Lalmonirhat emerged as a district from mahakuma by the inauguration of then gender and social welfare minister of Bangladesh government Dr. Shafia Khatun on 1 February 1984.

[4] Lalmonirhat is in the north of Bangladesh and lies in the Teesta floodplain, and largely consists of agricultural land.

[6] The upazilas are: According to the 2022 Census of Bangladesh, Lalmonirhat District had 342,028 households and a population of 1,428,406, of whom, 20.42% of the inhabitants lived in urban areas.

The literacy rate (age 7 and over) was 71.30%, compared to the national average of 74.80% and the sex ratio was 100.09 males per 100 females.