Ireland is approximately 70,273 sq km, while Costa Rica is approximately 51,100 sq km, making Costa Rica 72.72% the size of Ireland. Meanwhile, the population of Ireland is ~5.2 million people (78,581 fewer people live in Costa Rica).
This to-scale map shows a size comparison of Ireland compared to Costa Rica. For more details, see an in-depth quality of life comparison of Costa Rica vs. Ireland using our country comparison tool.