New Jersey is about 315 times bigger than San Marino.

San Marino is approximately 61 sq km, while New Jersey is approximately 19,211 sq km, making New Jersey 31,393% larger than San Marino. Meanwhile, the population of San Marino is ~34,682 people (8.8 million more people live in New Jersey).
This to-scale comparison of San Marino vs. New Jersey uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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