The youth was arrested on Monday while the incident took place on Saturday night. The accused belong to a former village pradhan's family and are from a different community.
Unnao district in Uttar Pradesh has been in the news for all the wrong reasons in recent years.
The Dalit woman was allegedly raped by four upper-caste men in Hathras on September 14.
The accused have been charged under the Indian Penal Code (IPC) and the Protection of Children from Sexual Offences (POCSO) Act.
Based on a complaint filed by the woman, a case was registered against two men on charges of gang rape and three others on charges of criminal conspiracy, the police said.
The family members alleged that the girl ended her life as her complaint was not registered, a charge denied by the police, who said that the victim's kin had not given any application to lodge an FIR.
The case was earlier registered at Chandpa Police Station, in Hathras district of Uttar Pradesh, on a complaint by the victim's brother.
"The UP government claims that the journalist has links with some groups but has not offered any proof in this regard."
A case has been registered against Congress leaders Rahul Gandhi and Priyanka Gandhi Vadra, and over 200 others, according to the Gautam Buddh Nagar Police.
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