Solid methane (CH 4 ) was compressed up to 202GPa at 300K in a diamond-anvil cell. The crystal structure and equation of state over this entire range were determined from angle dispersive X-ray diffraction results. CH 4 undergoes phase transitions from rhombohedral to a simple cubic phase at 19GPa and from simple cubic to a higher pressure cubic phase at approximately 94GPa. This higher pressure cubic phase was stable to the maximum pressure investigated. Combined with previous optical measurements, it was found that at room temperature compressed CH 4 remains an insulator with cubic structure to 202GPa.