| Place Name | Duncans Mills |
| Place Type | Unincorporated |
| ZIP Code(s) | 95450 |
| County | Sonoma County |
| Area Code(s) | 707 |
| Timezone | Pacific Standard Time (PST) |
| Population () | |
| Metro/Micro Stats Area | Santa Rosa-Petaluma, CA |
| US Congressional District(s) | California 2nd |
| State Assembly Districts | 2 |
| State Senate Districts | 2 |