- The approximate areas of the states (as per current figures, which are generally expected unless the question specifies a historical context) are: - Andhra Pradesh: ~162,975 sq km - Gujarat: ~196,024 sq km - Karnataka: ~191,791 sq km - Tamil Nadu: ~130,058 sq km - Comparing these figures, Tamil Nadu (130,058 sq km) is the smallest in area among the four states listed.