The following is a list of the 35 municipalities (comuni) of the Province of Siena, Tuscany, Italy.
| ISTAT Code | Comune | Population, 31.12.2010 |
|---|---|---|
| 52001 | 6,722 | |
| 52002 | 7,299 | |
| 52003 | 3,197 | |
| 52004 | 3,880 | |
| 52005 | 2,971 | |
| 52006 | 9,133 | |
| 52007 | 2,485 | |
| 52008 | 2,913 | |
| 52009 | 7,447 | |
| 52010 | 2,036 | |
| 52011 | 8,838 | |
| 52012 | 21,629 | |
| 52013 | 2,769 | |
| 52014 | 5,272 | |
| 52015 | 14,558 | |
| 52016 | 9,165 | |
| 52017 | 8,812 | |
| 52018 | 1,565 | |
| 52019 | 2,427 | |
| 52020 | 4,187 | |
| 52021 | 2,186 | |
| 52022 | 29,634 | |
| 52023 | 1,690 | |
| 52024 | 1,165 | |
| 52025 | 954 | |
| 52026 | 5,308 | |
| 52027 | 1,703 | |
| 52028 | 7,806 | |
| 52030 | 2,774 | |
| 52031 | 4,905 | |
| 52032 | 54,543 | |
| 52033 | 12,926 | |
| 52034 | 9,925 | |
| 52035 | 7,522 | |
| 52036 | 1,380 | |