Member states of the International Labour Organization

The International Labour Organization (ILO), a specialized agency of the United Nations that sets international standards related to work, presently has 187 member states. Created in 1919 as a result of the Versailles Treaty, the ILO is the third oldest existing multilateral organization and the only remaining organization with direct links to the League of Nations.
At the founding of the ILO in 1919, there were 42 member states. 29 states which were signatories to the Versailles Treaty are considered "founder members", another 13 states, who were not signatories, were invited to be members and granted status as founder members. 
Member states.
Founding members appear with a blue background; states invited to be founding members appear with a khaki background.
Member withdrawals.
According to the ILO's constitution, a member state may only withdraw after giving notice of two years and settling all outstanding financial dues; following withdrawal a former member state is still obliged to comply with the ILO conventions the country has ratified. Readmission of a former member state, that has remained a UN member, requires formal communication to the ILO Director-General of acceptance of the obligations of the ILO constitution. A former member state that is not a UN member can only be approved for readmission by a decision of the International Labour Conference. Since 1927, 22 member states have withdrawn from the ILO, all subsequently were readmitted. 
Former non-sovereign state members.
The ILO constitution indicates that members must be sovereign states (initially, members of the League of Nations or, after 1945, members of the United Nations). This provision was affirmed on 26 August 1930 when the Permanent Court of International Justice ruled that Danzig, whose external relations were under Poland's control, was inadmissible to the ILO. Despite this ruling, three non-sovereign states, prior to achieving sovereign status, were for various periods admitted as members of the ILO.
Former members.
A blue background indicates an ILO founding member.