Ireland is approximately 70,273 sq km, while United States is approximately 9,833,517 sq km, making United States 13,893% larger than Ireland. Meanwhile, the population of Ireland is ~5.0 million people (321.6 million more people live in United States).
This to-scale map shows a size comparison of Ireland compared to United States. For more details, see an in-depth quality of life comparison of United States vs. Ireland using our country comparison tool.
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