Lakhai is located at Sylhet, Dhaka & Chittagong of Bangladesh. It is surrounded by Habiganj Sadar Upazila, Baniachang Upazila, Madhabpur Upazila of Habiganj, Nasirnagar Upazila of Brahmanbaria and Astagram Upazila of Kishoreganj where Lakhai Upazila is the centre Point. Main rivers- Meghna, Sutang, Monikhai, Balabhadra rivers.. It has 19465 units of house hold and total area 196.56 km². Lakhai is the connecting point of 3 administrative divisions
|Area Total||196.56 km2 (75.9 sq mi)|
|Population Total (1991)||110,319|
|Density||561/km2 (1,453/sq mi)|
|Time zone||BST (UTC+6)|
As of the 1991 Bangladesh census, Lakhai has a population of 110319. Males constitute are 49.24% of the population, and females 50.76%. This Upazila's eighteen up population is 53164. Lakhai has an average literacy rate of 21.6% (7+ years), and the national average of 32.4% literate. 
Lakhai thana, now an upazila, was established in 1922.
Lakhai Upazila's Head Quarter was shifted at the movement of people in 1983, started in 1974 centering the demand of establishing Thana Health Complex at the middle of Thana. On 19 January 1979 President Zia went to middle place of Bamai union instead of then proper union Lakhai and declared Lakhai as his thana. People of Lakhai Union filed writ against Presidential Order & movement were continued by both Lakhai Union and Bamai Union people for establishing Thana Headquarter in their own union. For Bamai union people Kadar Ali, Brigadier Shabab Ashfaq, Mukhles Chowdhury, Nazrul Islam, Moidor Ali, Tokon Mia, among others led the movement of Thana headquarters shipment to Kalauk of Bamai Union. In early eighties Dr Soroj Kumar Das & associates versus Mokhlesur Rahman Chowdhury were at daggers point in writing to various newspapers regarding Thana headquarters issue to the other fortnight. Retired Army personnel late Kadar Ali & his son Brigadier Shabab Ashfaq's role in making new headquarters at it's middle place Kalauk has been written in the history of Lakhai Upazila. In charge army officers submitted contradicting reports to the government but, finally on 15 April 1983 Lakhai thana's Headquarter was moved to the middle place at Kalauk of Bamai Union was inaugurated by Brigadier General A B M Elias later which turned into Upazila. As Kalauk is newly formed Mouza and Lakhai Union Parishad is 8 Kilometer away from present Upazila Headquarter a township is still in Lakhai, where a police inspection center is located and another police fari (post) is located at Madna of the same Upazila. Later a township was established centering Bamai 24 & 25 Zamindari Parganas as Mokhlesganj named after former adviser to the President of Bangladesh Mukhlesur Rahman Chowdhury where development council, club, and Mokhlesganj pourashava was also declared. Lakhai was a Police check post on Meghna during British Raj between Sylhet & Mymensing & finally became Thana.
Lakhai is connected through Habiganj, Ashuganj, Fandauk, Chatiain by road; Bhairab by launch and Shayestaganj, Shahjibazar, Nayapara by rail communications. Alhaj Azizur Rahman Chowdhury regional highway runs through Sarail, Nasirnagar, Lakhai, Habiganj route is important for road communications in this region. Lakhai-Dhaka and Lakhai-Sylhet direct bus services are available.
As of 2001 census average literacy rate of lakhai upazila is 28.7.0% (7+ years), where national average is 46.2%. . Lakhai literacy rate is low in general, but people are always advanced as they lived in Calcutta, Karachi & Dhaka all along for mainly business purpose, others are hard working. In Dhaka several thousands people of Lakhai reside where most of hotels, restaurants, Bakarkhani shops, newspaper stores, feriwalas are from Lakhai. Movements for establishing Sylhet Division were also organized by people of Lakhai as they are in large number in Dhaka.
Lakhai is famous for pithas and hospitality, rich with cross cultures of greater Sylhet, Dhaka & Chittagong's flavour & foreign connections, it is unique of Bangladesh.
Important educational institutes are-
Lakhai, Bamai, Morakori, Muriauk, Karab, Bulla, Katihara, Mokhlesganj, Madna, Sinhagram, Begunai, Teghoria, Bhadikara, Shibpur, Krishnapur, Dharampur, Moshadia, Fulbaria, Satauk,Sajangram, Begunai, Rarishal, Marugach, Noagaon, Sontoshpur, Zirunda Manpur, Kamrapur, Montoil.