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At the time of the Constitutional Convention there were actually thirteen colonies and in that sense, no "States" were represented. However, of those thirteen colonies, the only one absent was Rhode Island at the behest of Patrick Henry who with Thomas Jefferson were vehemently opposed to the formation of a new Constitution rather than simply amending the then current Articles of Confederation.
Thus, there were actually twelve colonies that were "represented" at the Constitutional Convention. All of the existing colonies with the exception of Rhode Island would have meant that 55 representatives of 12 colonies including Georgia, South Carolina, North Carolina, Virginia, Deleware, Maryland, New York, Pennsylvania, Connecticut, New Jersey, New Hampshire and Massachussets would have been represented there.
Not all of the representatives present actually supported or signed the final draft of the Constitution of the United States. In fact, one of the things most commonly agreed upon at the Convention was that they would never really be able to agree on anything. At the behest of many of the Federalists of the day however, the Constitution was put to a vote and ultimately passed despite many objections most notably from people such as Patrick Henry and Thomas Jefferson. Thomas Jefferson was away in France at the time of the writing and despite being friends with James Madison only reluctantly supported the Constitution with the agreement that a Bill of Rights should be included as well ... and even this was not completed until his return from France.
