How Many Countries Are In The Organization Of American States?

As of 2026, the Organization of American States (OAS) has 35 member states.

Quick fact: These countries cover every independent nation in North, Central, and South America, plus the Caribbean. Together, they represent over 1.05 billion people—from the Arctic Circle all the way down to Cape Horn. You’ll find the OAS headquarters at 17th Street NW in Washington, D.C., sitting at roughly 38.8951° N, 77.0364° W.

What’s the geographic scope of the OAS?

The OAS stretches from Canada’s northernmost point—Alert, Nunavut—all the way to Ushuaia, Argentina, at the southern tip of South America.

It’s the world’s oldest regional organization, built on shared history, culture, and geopolitics across the Americas. Those 35 members span rainforests, deserts, mountain ranges, and island nations. That diversity makes the OAS a natural forum for tackling climate change, migration, trade, and human rights—issues that don’t respect borders. (Honestly, this is where the organization really earns its keep.) The work feels especially urgent in places like Central America and the Caribbean, where economic inequality and political instability can ripple across entire regions.

What are the key details about the OAS?

Category	Details
Founding Year	1948 (but its roots go back to agreements from 1890 and 1947)
Original Members (1948)	21 countries, including the U.S., Mexico, Brazil, Argentina, Chile, and Venezuela
Most Recent Members	Canada (1990), Guyana and Suriname (1991)
Non-Member Sovereign States in the Americas	Cuba (suspended 1962–2009, withdrew 2012), but could rejoin if it meets the criteria
Decision-Making Threshold	Most resolutions pass with an absolute majority; budget and constitutional matters need two-thirds

Why was the OAS created, and how has it evolved?

The idea started with Simón Bolívar back in 1826 at the Congress of Panama, though the modern OAS took shape after World War II.

Back then, the goal was simple: keep outside powers—especially European ones—from interfering in the Americas and to keep peace among its members. Over time, though, the OAS broadened its focus. Now it monitors elections, fights corruption, and coordinates disaster response. (That’s a far cry from Bolívar’s original vision, but hey, organizations adapt.) You’ll see its influence in places like Haiti and Honduras, where it helped steady shaky democracies. Even territorial disputes—like the long-running tension between Guyana and Venezuela over the Essequibo region—often land on the OAS’s agenda. Culturally, it’s a living bridge, weaving together Indigenous, African, European, and mestizo influences across three continents.

Its home, the Pan American Union Building, is a piece of history. Built in 1910 with a neoclassical design by French architect Paul Cret, the marble halls have hosted everyone from FDR to Pope Francis. Today, diplomats work in six official languages: Spanish, English, Portuguese, French, Dutch, and Haitian Creole.

Can I visit the OAS headquarters?

Yes—you can tour the Pan American Union Building in Washington, D.C., with guided visits that include exhibits on hemispheric cooperation, human rights cases, and environmental projects.

If you swing by, you’ll see firsthand how the organization tackles everything from climate change to youth leadership programs. As of 2026, most meetings happen in a hybrid format, so even remote participants can join in. Want to catch a public event? Check the OAS events calendar. Travelers: the U.S. dollar is widely accepted, but don’t assume it’ll work everywhere—especially in the Caribbean or South America, where local currencies rule.

Curious about membership rules or current projects? The OAS About Us page has real-time updates on summits, resolutions, and court rulings across the Americas.

Which countries are currently members of the OAS?

The OAS has 35 member states, including the U.S., Canada, Mexico, Brazil, Argentina, Chile, and most Caribbean nations.

Here’s the full list: Antigua and Barbuda, Argentina, The Bahamas, Barbados, Belize, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba (though suspended and withdrawn), Dominica, Dominican Republic, Ecuador, El Salvador, Grenada, Guatemala, Guyana, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Paraguay, Peru, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Suriname, Trinidad and Tobago, United States, Uruguay, and Venezuela.

How does a country join the OAS?

Any sovereign state in the Americas can apply, and membership requires approval from a two-thirds majority of existing members.

Here’s the catch: the process isn’t just about paperwork. Countries need to demonstrate a commitment to democracy, human rights, and regional cooperation. Historically, Canada, Guyana, and Suriname followed this path in the early 1990s. Cuba, meanwhile, joined in 1948 but was suspended in 1962 and later withdrew in 2012. It’s still eligible to rejoin if it meets the criteria. (Politics can be messy, right?)

What happens if a country violates OAS principles?

Depending on the severity, the OAS can suspend a member’s voting rights or even expel it from the organization.

Take Cuba, for example. It was suspended in 1962 for aligning with communist states during the Cold War. The suspension lasted until 2009, but Cuba ultimately withdrew in 2012. That said, the OAS prefers dialogue over punishment. Most disputes—like election controversies or human rights violations—get addressed through mediation before escalating to suspension. It’s a last resort, not a first response.

How does the OAS make decisions?

Most decisions pass with an absolute majority, but budget and constitutional matters require a two-thirds majority.

Each member gets one vote, and the General Assembly is the main decision-making body. Smaller committees handle specific issues like human rights or security. That structure keeps things moving, but it also means big decisions can get bogged down in negotiations. (Anyone who’s sat through a committee meeting knows how that goes.) The OAS tries to balance efficiency with inclusivity—no easy feat with 35 members.

What’s the OAS’s role in human rights?

The OAS runs the Inter-American Commission on Human Rights and the Inter-American Court of Human Rights to investigate abuses and enforce protections.

These bodies handle complaints from individuals and groups, issue reports on systemic issues, and even order remedies for victims. Recent cases have tackled everything from police violence in Brazil to indigenous land rights in Canada. (Honestly, this is one of the OAS’s most impactful functions.) The commission can also conduct on-site visits to assess conditions firsthand. It’s not just talk—these mechanisms have real teeth when governments fall short.

How does the OAS handle territorial disputes?

The OAS often mediates disputes between member states, like the ongoing tension between Guyana and Venezuela over the Essequibo region.

Its role isn’t to impose solutions but to facilitate dialogue and propose compromises. In Guyana vs. Venezuela, the OAS has pushed for negotiations under international law, trying to prevent escalation. That’s a tricky balance—diplomacy requires patience, and patience isn’t always in supply. Still, the OAS’s involvement keeps the pressure on both sides to find a peaceful resolution.

What’s the OAS’s budget, and who funds it?

The OAS operates on a biennial budget of roughly $120 million, funded primarily by member state contributions based on their GDP.

Larger economies like the U.S., Brazil, and Canada foot the biggest bills, while smaller Caribbean nations contribute less. The budget covers everything from staff salaries to peacekeeping missions. (Fun fact: the U.S. typically covers about 42% of the total.) Don’t expect luxury—this isn’t a billion-dollar bureaucracy. Instead, it’s a lean operation focused on getting results where it matters most.

How does the OAS support democracy?

The OAS monitors elections, trains electoral observers, and issues reports on democratic backsliding across the Americas.

After political crises in Haiti or Honduras, the OAS often steps in to help restore trust in institutions. It also runs programs for civil society groups and young leaders, hoping to build resilience against authoritarianism. (That’s not just idealism—it’s prevention.) The organization’s election observation missions are particularly well-regarded. They don’t just rubber-stamp results; they provide detailed critiques to help countries improve.

What’s the OAS’s stance on climate change?

The OAS promotes regional cooperation on climate adaptation, disaster response, and sustainable development across the Americas.

Small island nations in the Caribbean are on the front lines of rising seas, while South American countries grapple with deforestation. The OAS tries to coordinate responses, from sharing best practices to securing funding for vulnerable communities. (It’s not a climate authority—more like a coordinator.) Recent initiatives have focused on renewable energy and protecting biodiversity hotspots like the Amazon. If you’re looking for a hemispheric approach to climate action, this is where it happens.

How does the OAS engage with Indigenous peoples?

The OAS works with Indigenous groups through the Indigenous Peoples’ Participation Mechanism, ensuring their voices shape policies on land rights and cultural preservation.

This isn’t just symbolic. The mechanism lets Indigenous leaders attend OAS meetings and submit proposals directly. Recent efforts have targeted issues like illegal mining in the Amazon or the lack of clean water in remote communities. (About time, right?) The OAS also funds projects to revitalize Indigenous languages and traditions. It’s a small but meaningful step toward addressing historical injustices.

What challenges does the OAS face today?

The OAS struggles with political divisions among members, funding shortages, and balancing sovereignty with collective action.

Take the U.S.-backed resolutions on Venezuela or Nicaragua—some members see them as interference, while others call them necessary. Then there’s the budget crunch: when big economies like the U.S. delay payments, programs get cut. (Bureaucracy isn’t pretty anywhere.) Add in rising authoritarianism in parts of Latin America, and you’ve got a perfect storm. The OAS isn’t perfect, but it’s still the best tool the region has for working together.