Ratangarh - Its old name was Kolasar, which was converted to present name by Raja Surat Singh in name of his son Kunwar Ratan Singh in 1803.
Sardarshahar - Its old name was Rajiasar village of Saran Jats, built a fort here and then first changed it to Sardargarh, later changed to Sardarshahar in name of Kunwar Sardar Singh of Bikaner in 1838.