Udayapur District (Nepali: उदयपुर जिल्ला, is one of the 14 districts of Koshi Province in eastern Nepal. The district, with Triyuga as its district headquarters, covers an area of 2,063 km2 and in 2001 had a population of 287,689, in 2011 of 317,532, in 2021 of 342,773
Triyuga is one of the eight municipalities of Udayapur district of the Koshi Pradesh of Nepal. Gaighat is the headquarter of the municipality. According to the 2021 Nepal census the total population of the municipality is 103,475. It is divided into 16 wards. Triyuga Municipality was established on B.S. Chaitra 13, 2053. It was named after Triyuga River. A river which flows through the town. Triyuga is the 3rd largest municipality in Nepal and 1st largest in Koshi Pradesh in term of size (area). The total area of the municipality is 547.43 square kilometres (211.36 sq mi)
Baraha, Sagarmatha is a village development committee in Udayapur District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 2738 people living in 471 individual households.
Bărăi is a village development committee in Udayapur District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 4613.
Chaudandi is a village development committee in Udayapur District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 2715 people living in 469 individual households.
Jalpachilaune is a populated place located in Triyuga municipality of Udayapur District in Province No. 1 of Nepal. At the time of 2011 Nepal census it had a population of 3,864 people living in 807 individual households.
Jante is a village development committee in Udayapur District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 2142 people living in 385 individual households.
Jogidaha is a populated place located in Triyuga municipality of Udayapur District in Province No. 1 of Nepal. At the time of 2011 Nepal census it had a population of 6,665 people living in 1,451 individual households.
Katari is a Municipality in Udayapur District in the Koshi province of south-eastern Nepal. It lies by the Tawa river having the bridge of length 123.5m. This was established by merging two existing village development committees i.e. Triveni and Katari on 18 May 2014. At the time of the 1991 Nepal census it had a population of 7230 people living in 1410 individual households. Thirty years later, Katari had undergone rapid growth, achieving a population of 56,146 people by the 2011 census. There is a big Government school Triveni secondary school
Khanbu is a populated place located in Triyuga municipality of Udayapur District in Province No. 1 of Nepal. At the time of 2011 Nepal census it had a population of 4,350 people living in 782 individual households.
Panchawati is a village in, and headquarter of, Udayapurgadhi rural municipality in Udayapur District in Province No. 1 of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 6,580 people living in 1223 individual households.
Risku is a village development committee in Udayapur District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 11,546 people living in 2083 individual households.
Saune is a populated place located in Triyuga municipality of Udayapur District in Province No. 1 of Nepal. At the time of 2011 Nepal census it had a population of 2,678 people living in 518 individual households.
Tapeshwari is a village development committee in Udayapur District in Province No. 1 of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 97045.
Tawasri is a village development committee in Udayapur District in the Sagarmatha Zone of south-eastern Nepal. At the time of the 1991 Nepal census it had a population of 4612 people living in 843 individual households.
Triveni is a town in Katari Municipality, Udayapur District, in the Sagarmatha Zone of south-eastern Nepal. The formerly Triveni village development committee was merged to form a new municipality in May 2014. At the time of the 1991 Nepal census, Triveni had a population of 6,015 people, living in 1,105 individual households.
Udayapur is a village in Kapilvastu District of the Lumbini Province of southern Nepal. At the time of the 1991 Nepal census it had a population of 2814 people living in 478 individual households.
Belaka is a municipality located in Udayapur District of Province No. 1 of Nepal. It is one of four urban municipalities located in Udayapur District.
Limchungbung (earlier:Sunkoshi) is a rural municipality in Udayapur district of Koshi Province in Nepal. There are 4 rural municipalities in Udayapur district. There are 5 wards in this municipality. According to 2011 census of Nepal, the total population of the municipality is 11,992 and total area is 106.8 km². The headquarter of the municipality is in Baraha
Tapli Rural Municipality is a rural municipality in Udayapur district of Province No. 1 in Nepal. There are 4 rural municipalities in Udayapur district. There are 5 wards in this municipality. According to 2011 census of Nepal, the total population of the municipality is 14,567 and total area is 119. km². The headquarter of the municipality is in Rupatar
Nepal 
