The Maratha people in Uttar Pradesh are the descendants of the Marathi speaking immigrant soldiers and administrators settled in the state of Uttar Pradesh in India. They immigrated to and settled in the present day Uttar Pradesh during the period of Maratha rule in the region. Most of these families arrived as a part of the army sent by Baji Rao Peshwa.
Today, they are found mainly in the districts of Jhansi, Jalaun, Banda, Lalitpur and Kanpur.
The Maratha now speak Bundelkhandi and Hindi, although historically spoke Marathi.
References
Maratha (Uttar Pradesh) Wikipedia(Text) CC BY-SA