West Bengal shares longest border with which state?

The correct answer is Jharkhand. Key Points West Bengal shares the longest border with the state of Jharkhand. The length of border between West Bengal and Jharkhand states is 500 km. Additional Information West Bengal shares its borders with five Indian states ( Bihar, Jharkhand, Odisha, Sikkim, and Assam ). Each of these borders has its own cultural, historical, and political significance.