| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sycamore | city | California | United States | 39.13 | -121.94 | 39 | |
| Sycamore Cove | city | California | United States | 34.07 | -119.01 | 88 | |
| Sycamore Creek Mobile Home Park | city | California | United States | 33.21 | -117.23 | 400 | |
| Sycamore Flat | city | California | United States | 36.27 | -121.39 | 830 | |
| Sycamore Hills | city | California | United States | 33.60 | -116.95 | 2509 | |
| Sycamore Springs | city | California | United States | 35.19 | -120.71 | 830 | |
| Sycamore Springs | city | California | United States | 33.62 | -116.96 | 2509 | |
| Sydney Town (historical) | city | California | United States | 37.80 | -122.40 | 55 | |
| Sykes | city | California | United States | 36.04 | -117.96 | 3507 | |
| Sylmar | city | California | United States | 34.31 | -118.45 | 1213 | |
| Sylvan Lodge | city | California | United States | 38.08 | -120.16 | 5029 | |
| Sylvan Meadows | city | California | United States | 33.53 | -117.28 | 1853 | |
| Sylvan Park | city | California | United States | 37.38 | -122.06 | 121 | |
| Sylvandale (historical) | city | California | United States | 39.49 | -123.42 | 2509 | |
| Sylvia Park | city | California | United States | 34.12 | -118.58 | 1669 |