San Marino Map with Castelli

San Marino has 9 castelli, and all 9 are drawn on this map. Castello is the Sammarinese word for a municipality, and the nine cover the whole republic: the City of San Marino, Borgo Maggiore, Serravalle, Acquaviva, Chiesanuova, Domagnano, Faetano, Fiorentino and Montegiardino. Their combined area is 61.19 km² (23.63 sq mi). Each one is run by a Giunta di Castello elected every five years, the internal boundaries have been stable since 1463, and a 1925 law gave the castelli their modern administrative form.

Serravalle is the largest castello in San Marino at 10.53 km² (4.07 sq mi), based on January 2025 figures. That is about a sixth of the republic's total 61.19 km² (23.63 sq mi). Serravalle lies north of Monte Titano on flatter ground, which is where most of the country's industry and commerce sits. It is also first by population, with 11,226 residents in January 2025. For comparison, the smallest castello, Montegiardino, measures 3.31 km² (1.28 sq mi), so Serravalle is roughly three times larger.

Serravalle is the most populous castello in San Marino, with 11,226 residents recorded in January 2025. It is the republic's main productive hub and holds the largest concentration of population and workplaces, sitting on the lower, flatter northern ground rather than on Monte Titano. The capital, the City of San Marino, is smaller in population despite housing the government, the UNESCO-listed old town and the Three Towers. At the other end of the scale, Montegiardino counted 1,004 residents in January 2025, fewer than a tenth of Serravalle's total.

Montegiardino is the smallest castello in San Marino on both measures. It covers 3.31 km² (1.28 sq mi) and had 1,004 residents in January 2025, making it the least populous of the nine as well as the smallest by area. It sits in the southeast of the republic, in the rural belt that also includes Fiorentino with its medieval fortress. Even so, Montegiardino has the same institutional standing as Serravalle: it elects a Giunta di Castello for a five-year term, exactly like every other castello.

The capital of San Marino is the City of San Marino, which is both a castello in its own right and the seat of the republic's institutions. It occupies the summit of Monte Titano and contains the Three Towers, Guaita, Cesta and Montale, along with the historic center listed by UNESCO. Below it, Borgo Maggiore holds Piazza Grande and the lower station of the cableway that links the two. The capital is not the largest castello by population: that is Serravalle, with 11,226 residents in January 2025.

In San Marino, castello is the official name for a first-level administrative division, and it works the same way a municipality does elsewhere. English sources usually translate it as "municipality" or "township", but the Sammarinese term is distinctive: it recalls the fortified medieval castles around which the districts grew, while the boundaries roughly follow the republic's old parishes. The word does not mean each one is a castle, although fortifications do stand in several, including the Three Towers in the City of San Marino and the medieval fortress at Fiorentino. Every castello elects a Giunta di Castello every five years.

San Marino's internal boundaries date to 1463, the year of the republic's last territorial expansion, after which the lines settled into their current form. As administrative units the castelli are younger: a 1925 law formalized the nine districts, councils were added in 1945, and direct election of the Giunte di Castello followed in 1979. Unlike most European countries, San Marino has never gone through a modern municipal merger reform, so the count has stayed at 9 across the whole 61.19 km² (23.63 sq mi) national territory.

Ultimaps handles San Marino maps entirely on the site, in a browser tab; using the free tier involves no account at all. Nine shapes means the data route is short: a nine-line table, castello names in one column and figures in the next, is all the input a shaded map needs. Hand-coloring is available as well — clicking Faetano or Domagnano opens a fill picker for that castello only. You choose the color ramp, while background, label wording, typeface and boundary weight are set separately. Point markers accept a place or a coordinate pair, so you can flag the Three Towers or Borgo Maggiore, with a caption if useful. For output, choose between PNG, PDF and SVG.