As of May 2026, the population of San Marino is 33.6 thousand. The number of inhabitants has decreased by 21 in the last year, representing a decline of 0.07%. The median age of the population has increased in recent years, rising from 43.9 years in 2016 to 48.7 years in 2026. Currently, life expectancy at birth is 84 years and population density is 550.2 inhabitants per square kilometer.
The population growth rate of San Marino peaked in 2011, reaching around 3.34% annually, but has since declined to approximately -0.06% in 2026. The annual increase in the number of people has also decreased from a peak of around 1.08 thousand in 2011 to nearly -21 in 2026.
In San Marino, life expectancy at birth has been increasing, with the indicator rising from 81.6 years in 2006 to 84 years in 2026, representing an increase of more than 2 years over the past 2 decades.
The cities of San Marino are small, with the 5 most populated adding up to around 34.2 thousand inhabitants. The most populous city is Serravalle, with approximately 9.3 thousand inhabitants. It is followed by Dogana, Serravalle with 7 thousand and Valdragone, Borgo Maggiore with 7 thousand.
These are the 15 most populous cities in San Marino:
| # | City | Population |
|---|---|---|
| 1 | Serravalle | 9,258 |
| 2 | Dogana, Serravalle | 7,000 |
| 3 | Valdragone, Borgo Maggiore | 6,983 |
| 4 | Borgo Maggiore | 6,424 |
| 5 | San Marino | 4,500 |
| 6 | Domagnano | 3,161 |
| 7 | Fiorentino | 2,510 |
| 8 | Cailungo, Borgo Maggiore | 2,076 |
| # | City | Population |
|---|---|---|
| 9 | Murata, San Marino | 1,580 |
| 10 | Acquaviva | 1,530 |
| 11 | Faetano | 1,177 |
| 12 | Falciano, Serravalle | 1,000 |
| 13 | Poggio di Chiesanuova, Chiesanuova | 951 |
| 14 | Monte Giardino, Montegiardino | 910 |
| 15 | Fiorina, Serravalle | 889 |