Explore San Marino - A Nation of 33745 People. San Marino (SM) is a diverse and thriving country spanning 61 km² (24 sq mi). With a population density of 553 people per km², it offers a unique blend of cultural heritage, economic opportunities, and breathtaking landscapes. Whether you're interested in tourism, business, or history, San Marino stands out as a global destination. Stay informed about San Marino’s geographic insights, demographic trends, and more. Discover why San Marino is a key player on the world stage today!