Ceylon Mission took over Chellappah School in 1901 and named it American Mission English School. It became a Bilingual School in 1929. In 1939 the schools amalgamated as Tellippalai Union High School. In 1940 it got the current name Tellippalai Union College. In 1961 the school became a government school. From 12/12/1990, the school begins functioning at Ramanathan College as the Sri Lankan army moved into Tellippalai and the whole population from the area got displaced. 10/09/2002 The school started functioning at its original location of Tellippalai which was inside the high security zone. In 2006 a new class room block was built as most of the buildings were damaged. In 2011 high security zone at Tellippalai area was removed and the school started operating normally. In 2016 the school is celebrating its 200th anniversary. Principals of Union College Before 1939: Rev B. H. Rice, Rev. S. Veerakathy, Mr. S. M. Kandaihpillai, Mr. Taylor Thuraiappapillai, Mr J. V Chellappah, Mr. S. M. Veluppillai, Mr G.A. Ratnavarathar, Mr. C. C. Kanapathippillai, Mr. S.. K. Rasiah After 1939: I.P.Thurairatnam, K.Krishnapillai, T.Nadarajah, Kathir Balasundaram, N.Pushpanathan, N.Kandasamy, P.Kamalanathan, S.Punniyaseelan and V. K. Radnakumar I.P.Thurairatnam's noteworthy accomplishments: introduced Senior School Certificate, London Matriculation, University Entrance and High School Certificate classes, inter-house system, Student Christian Movement, Old Boys' Association, Prize Giving, Scout Troop, Cricket and Football, and constructed Malaya Block, pipe-water supply, acquired Second Playground, renovated Biology and Physics laboratories, held Union Carnival and Exhibition and published The Union Pictorial. Union College became Grade I school in 1947. T. Nadarajah reversed the decline of the school after the school was acquired by the government in 1961. Novelist Kathir Balasundaram's noteworthy accomplishments: built a large Water Tank and an Open Air Theatre in a newly acquired piece of land, produced good G.C.E A/L results in the period 1986–1990 and constructed a Hindu Temple in 1986. Saturday Review in 1986 in its editorial declared him the best public school administrator in the Jaffna District. K. Kandasamy successfully managed the school when it got displaced in 1990 due to Sri Lankan Civil War. S.Punniyaseelan brought the school back to normal operation after the Sri Lankan Civil War. Old Students Associations Union college Old Students Association, Jaffna Union college Old Students Association, Colombo Union college Old Students Association, Canada Union college Old Students Association, UK Union College Old Students Association, Sydney Union college Old Students Association, Melbourne Union college Old