Step 1: Understanding the Question:
Coal is India's most important commercial energy mineral, and its production is concentrated in a handful of states with large coal-bearing sedimentary basins.
Step 2: Naming two states.
Jharkhand is India's leading coal producing state, home to the Jharia and Bokaro coalfields. Chhattisgarh is another major producer, with large reserves in the Korba coalfield.
Final Answer:
Jharkhand and Chhattisgarh are two important coal producing states of India (Odisha, West Bengal and Madhya Pradesh are other valid examples).\[ \boxed{\text{Jharkhand, Chhattisgarh}} \]