The following is a list of the 35 municipalities ( comuni ) of the Province of Siena in the region of Tuscany in Italy.
| Municipality | Population (2025) [1] | Area (km²) [2] | Density |
|---|---|---|---|
| Abbadia San Salvatore | 6,105 | 58.99 | 103.5 |
| Asciano | 6,756 | 215.64 | 31.3 |
| Buonconvento | 2,964 | 64.84 | 45.7 |
| Casole d'Elsa | 3,675 | 148.69 | 24.7 |
| Castellina in Chianti | 2,605 | 99.80 | 26.1 |
| Castelnuovo Berardenga | 8,851 | 177.11 | 50.0 |
| Castiglione d'Orcia | 2,081 | 141.66 | 14.7 |
| Cetona | 2,438 | 53.57 | 45.5 |
| Chianciano Terme | 7,096 | 36.58 | 194.0 |
| Chiusdino | 1,702 | 141.62 | 12.0 |
| Chiusi | 8,081 | 58.15 | 139.0 |
| Colle di Val d'Elsa | 21,605 | 92.06 | 234.7 |
| Gaiole in Chianti | 2,485 | 128.89 | 19.3 |
| Montalcino | 5,569 | 310.31 | 17.9 |
| Montepulciano | 13,032 | 165.33 | 78.8 |
| Monteriggioni | 9,950 | 99.72 | 99.8 |
| Monteroni d'Arbia | 9,029 | 105.91 | 85.3 |
| Monticiano | 1,605 | 109.50 | 14.7 |
| Murlo | 2,479 | 114.61 | 21.6 |
| Piancastagnaio | 3,849 | 69.63 | 55.3 |
| Pienza | 1,928 | 122.96 | 15.7 |
| Poggibonsi | 28,062 | 70.59 | 397.5 |
| Radda in Chianti | 1,436 | 80.42 | 17.9 |
| Radicofani | 1,044 | 118.10 | 8.8 |
| Radicondoli | 950 | 132.57 | 7.2 |
| Rapolano Terme | 5,115 | 83.04 | 61.6 |
| San Casciano dei Bagni | 1,421 | 92.14 | 15.4 |
| San Gimignano | 7,452 | 138.60 | 53.8 |
| San Quirico d'Orcia | 2,560 | 42.12 | 60.8 |
| Sarteano | 4,515 | 84.81 | 53.2 |
| Siena | 52,990 | 118.53 | 447.1 |
| Sinalunga | 12,084 | 78.66 | 153.6 |
| Sovicille | 9,852 | 143.61 | 68.6 |
| Torrita di Siena | 6,957 | 58.24 | 119.5 |
| Trequanda | 1,137 | 63.98 | 17.8 |
