Location in Jharkhand, India
|Elevation||183 m (600 ft)|
|• Official||Hindi, Santali|
|Time zone||UTC+5:30 (IST)|
Sini is located at  It has an average elevation of 183 metres (600 feet). The main source of livelihood for the common people is the Railway Workshop situated near the Sini Railway Station. There is also one Zonal Railway Training Institute (Z.R.T.I.) of Indian Railways situated at Sini. Sini is also blessed to have a very old cricket ground, popular as "Shershah Ground" (South Eastern Railway Sports Association or S.E.R.S.A.) where many inter division level competitions are held on a regular basis..
As of 2001 India census, Sini had a population of 6,489. Males constitute 53% of the population and females 47%. Sini has an average literacy rate of 72%, higher than the national average of 59.5%: male literacy is 80%, and female literacy is 63%. In Sini, 12% of the population is under 6 years of age.