I count at least four, more if you want to include the Russians and Indians. The US, UK, Japan and France certainly all have had that capability at one time or another. China will soon have it, if you count the level the Russians and Indians had/have as being up to the task.
I forgot France, tho Im not sure of their amphib capability. The Soviets did have a small CV but did they have the amphib capability? If I remember right they used CVs like they used the rest of their surface fleet, in order to clear lanes for their missile subs to break out into the North Atlantic.
I dont think the Indians have the ability to project that type of invasion power so far away and China, tho building, has a very small amphib/marine force. Im not just talking having a CV, or CV type, but the ability to float a powerful ground force to a far away conflict, invade, and provide both support and air power. this takes a powerful amphibious element, CVs with both attack and defensive fighters, helicopters, marines, troop ships, supply ships, offensive and defensive missile/gun platforms. Its far more complicated then just sailing a CV somewheres.