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Chamarajanagar is a town in the southern end of Karnataka, a state in India. It is also the headquarters of the Chamarajanagar district of Karnataka. It is named after Chamaraja Wodeyar IX (1774–1796), king of Mysore, who was born in the town. It is also one of the less developed towns in Karnataka, even though it is situated on the interstate that links Tamil Nadu and Kerala
Chamarajnagar is located at  It has an average elevation of 662 metres (2171 feet)..
As of the 2008 India census, Chamrajanagar had a population of 77,810. Males constituted 51% of the population and females 49%. Chamrajanagar has an average literacy rate of 60%, higher than the national average of 59.5%; with male literacy of 65% and female literacy of 54%. 12% of the population is under 6 years of age.
From the state capital Bangalore, the State Highway 17 can be used to reach Chamarajanagar via Mysore, Chamarajanagar is at a distance of 61 km from Mysore. The distance from Bangalore to Chamarajanagar is about 185 km. The Bangalore-Kanakapura-Kollegal-Chamarajanagar road can also be used with the distance being the same.
Chamarajanagar-Nanjangud railway line was opened to service on 27 August 1926. Chamarajanagar has a new railway station since the railway track was upgraded to broad gauge from one metre gauge in November 2008. The project to construct a new railway line from Chamarajanagar to Satyamangalam, Gobichettipalayam, Erode is progressing slowly. It will reduce the distance between Bangalore and Chamarajanagar and other cities of Tamil Nadu. The proposal to extend the railway line further to Mettupalayam in Tamil Nadu has not yet received environmental clearance.
On the day of the new BG line inauguration, a local committee at Chamarajanagar presented a memorandum to the then Minister for Railways for State, Dr. Velu to take up the construction work between Chamarajanagar and Mettupalayam directly, and also to take up the construction work of the Bangalore—Mettupalayam railway line via Satyamangalam. They have conveyed the importance of connecting Satyamangalam with Gobichettipalayam and Erode. This proposal will bring the eastern as well as the western coastal regions closer to the northern region via Chamarajanagar.
Since Feb 2010, the Tirupati Express (213) has been extended to Chamarajanagar station and is the only long route train from Chamarajanagar.
In 2010, the Railway Budget proposed to conduct a survey for the newline between Chamarajanagar and Krishnagiri. This line will connect Chennai and Mysore directly; that means: through Chennai-Krishnagiri-Chamarajanagar-Mysore instead of the busy Chennai-Bangalore-Mysore route.
The 2011 railway budget proposed to conduct a survey for a newline between Tumkur and Chamarajanagar.
Chamarajanagar Railway Station is the 'Southern Most' rail point of Karnataka.Station code is CMNR.
Chamarajanagar is also known as the 'Granite City'. There are many tourist spots to visit around the city. These are:
- Chamarajeshwara temple
- Janana Mantapa of Sri Chamaraja Wodeyar
- B R Hills (Biligiri Rangana Betta)
- Haralukote Anjaneya & Janardhanaswamy Temple is about 5 km from Chamarajanagar
- Bannari Amman Temple Bannari is about 60 km from Chamrajnagar
- K.Gudi (Jungle Lodge)
- MM Hills (Male Mahadeshwara Betta)
- Bandipura (Wild life Sanctuary)
- Talkad (Piligrimage centre)
- Somanathpur (Historical place)
- Shivanasamudra (Shivanasamudra Falls)
- Karivaradarayana Hills
- water reservoirs,Chikkahole and Suvarnavathi just 15 km from Chamarajanar.
- Boodhipadaga, Veerappan was jailed here.
- Sri Kshetra Kanakagiri, Jain Pilgrim Centre 
- Parsvanatha Jain Basadi, A.D 1117, located at heart of the City.
- Himavad_Gopalaswamy_Betta', 60 km from Chamarajanagar towards Bandipur
- Sri Hulugana Maradi Venkataramanaswamy Betta', 35 km from Chamarajanagar Via Terakanambi
- Sri Swarnagowri Devalaya, Kuderu-571316', 18 km from Chamarajanagar Via Santhe Marahalli
- Sri Kaavi Basaveswara Temple, Kuderu-571316', 18 km from Chamarajanagar Via Santhe Marahalli
- Sri VeerabadreswaraSwamy Temple, Kuderu-571316', 18 km from Chamarajanagar Via Santhe Marahalli
Bhavani sagar dam 75 km from Chamrajnagar via Bannari
Notable Personalities of the District
- Yadayur Siddalingeshwara, 15-16th century, saint & philosopher
- Nijaguna Shivayogi, 16-17th century, saint, classical musician & poet
- Sanchi Honnamma, 17th century, revolutionary lady poet
- B.Rachaiah, ex-governor of Kerala
- Dr. Rajkumar, prominent Kannada film actor
- K.Venkataraju, Local theater person and play writer, founder of Shanthala Kalavidaru
- 'C.M.Narasimha Muthy', Folk singer and Ex member of Karnataka Nataka Academy
- Shivu surapura', Software Engineer and Folk Singer
- 'Lakshmi Narasimha', Historian, Columnist, leading farmer.
- Sri Venkata Dasappa alias Pachappa',Famous Hotelier
- Subhash.Y.R', Follower of Leading Swadeshi Andolan Sri. Rajiv Dixith
- R Pradeep Dixit', Sanskrit Vidwan. "Sri Ramashesha Samskrutha Patasala"
- Falling Rain Genomics, Inc - Chamarajnagar
- "Census of India 2001: Data from the 2001 Census, including cities, villages and towns (Provisional)". Census Commission of India. Archived from the original on 2004-06-16. Retrieved 2008-11-01.
Temple comt members shri shri shri varasiddi vinayaka temple.vinayakana gudi beedi.Ramasamudra.R.N.sundar., R.D.Nagaraju,Sheshu,Nataraju,R.M.Nagu,Sheshadri.R.B, Shridhara,