Area of Dhalai: 4,870 acres (19.71 km2).
North: Farhadabad Union
East: Halda River
South: Guman Mardan Union
West: Farhadabad Union
In 1974 The government declared that it is good village in terms of crimes in Bangladesh.
As of 1991 Bangladesh census, Dhalai union has a population of 29,571 and house units 4872.
- Katirhat Woman's College
- Katirhat High School
- Katirhat Girl's High School
- West Dhalai High School
- Enayetpur High School
- Katirhat Dakhil Madrasa
- Hadhurkhil Mohila Dhakil Madrasha
More than 8 primary schools and Kindergarten.
This union was declared 100% literate during 1997 by Govt. of Bangladesh.
Marketplaces and bazars
Katirhat bazar,Hadurkhill, Monia Pokor, Noea Hat,