Where is Ramanujacharya's Jeeva Samadhi located? Is it located in Tamilnadu or anywhere else in India?
There is no Jeeva samadhi for Ramanujacharya. The actual body of Ramanujacharya is still preserved in Sri Rangam temple. There is Udayavar Sannidhi. Udayavar is another name of Ramanujacharya conferred by Lord Ranganatha himself.
For more details on the mortal remains of the body, see How much does the divinely created statue of Ramanujacharya resemble him?