The headquarters of the OECD (Organisation for Economic Co-operation and Development) is located in Paris, France.

Background of OECD:
The OECD is an international organization that aims to promote economic growth, stability, and improved living standards among its member countries. It was established in 1961 and currently has 38 member countries, including both developed and developing nations.

Location of OECD Headquarters:
The headquarters of the OECD is situated in Paris, France. It is specifically located in the 16th arrondissement of Paris, which is a prestigious and affluent neighborhood in the city. The exact address is 2 rue André Pascal, 75775 Paris Cedex 16.

Reasons for Choosing Paris:
There are several reasons why Paris was chosen as the location for the OECD headquarters:

1. Historical and Cultural Significance: Paris is known for its rich history, culture, and intellectual heritage. It has long been a center for academia, art, and diplomacy, making it a suitable location for an international organization like the OECD.

2. Central Location: Paris is situated in the heart of Europe, making it easily accessible from other major European cities. This central location facilitates communication and cooperation among member countries.

3. Political Influence: France is one of the founding members of the OECD and has played a significant role in its establishment and development. Choosing Paris as the headquarters strengthens France's position within the organization and allows for closer collaboration with the French government.

4. Infrastructure and Facilities: Paris offers excellent infrastructure and facilities, including modern office spaces, transportation networks, and accommodation options. This ensures that the OECD headquarters can operate efficiently and effectively.

5. International Environment: Paris is a global city that attracts people from all over the world. Its diverse and cosmopolitan atmosphere provides an ideal setting for an international organization like the OECD, which aims to foster cooperation and dialogue among different nations.

In conclusion, the headquarters of the OECD is located in Paris, France, due to its historical significance, central location, political influence, infrastructure, and international environment.