Yamunanagar district is one of the 21 districts of the Indian state of Haryana. The district came into existence on 1 November 1989 and occupies an area of 1,756 square kilometres (678 sq mi). Yamunanagar town is the district headquarters.
The district is bounded by Himachal Pradesh state in the north, by Uttar Pradesh state in the east, by Karnal district in the south, by Kurukshetra district in the southwest and Ambala district in the west.
Yamuna Nagar has the river Yamuna running through the district, and forming the eastern boundary with the neighbouring Saharanpur district. This boundary is also a state boundary, as Saharanpur is in the state of Uttar Pradesh. The district also separates the Yamuna system from the Satluj river system.
Towards its northern edge is a sub-mountainous region, which has more forest cover and lots of streams; it is the area where the river Yamuna flows out of the hills and into the plains. The northern boundary is also an interstate boundary with the state of Himachal Pradesh to the north. Sirmour in Himachal is the district to its north with the towns of Nahan and Paonta Sahib close to the boundary with Yamuna nagar.
To its west and northwest is Ambala district, and to its west and southwest is Kurukshetra district. To its south is Karnal district.
This town was once part of District Kurukshetra before it was made as separate District of [Haryana]. This town became the new home of the refugees who migrated to this part of the country on the partition of the country in 1947 .Rampura Colony, Model Colony, Model Town and Gandhi Camp areas of modern city were reserved for them, the position remained as such up to 1970s. The place was earlier known as ‘Abdullahpur’ which was later renamed by the city’s eminent people as Jamnanagar and later on as Yamunanagar. Till 1947, it was a small hamlet of 6000 people, mostly population concentrated around Jagadhri Railway Station and Yamuna Gali, Old Radaur Road area. After partition of India, many migrants from Punjab in Pakistan chose to make Yamuna Nagar/Jagadhri their new home, and in the process. adding to the culture of the town. The area where land was allocated to the migrants, later developed into the Model Town area of Yamuna Nagar, the centre of the city area. The Topra Asokan pillar of Delhi was found in the village Topra Kalan, about 20 km from yamunanagar. Archaeological survey of India has found many Harrapan bricks and stones from the area.