As of July 2018, 189 countries are States parties to the CEDAW Convention, meaning that they agree to be bound by its terms.
The full list of State parties to CEDAW can be accessed here. The latest country to ratify is South Sudan (30 April 2015).
As of July 2018, countries that have not ratified CEDAW are:
Western Europe and other States
United States of America
Asia and the Pacific
Iran (Islamic Republic of)