1. Sacramento Mountains - eastern Mojave Desert
2. Saddle Peak Hills - SE corner of Death Valley NP
3. Sagehen Hills - Nevada County
4. Saline Range - northwest of Death Valley
5. Salmon Mountains - Siskiyou County (subrange of Klamath Mountains)
6. Salt Spring Hills - southeast of Death Valley NP
7. San Bernardino Mountains - Southern California (see San Andreas Fault)
8. SAN EMIGDIO MOUNTAINS - Kern County - Geologic History , Driving Map and see Wheeler Ridge Anticline
9. San Felipe Hills - Santa Clara County
10. San Felipe Hills - eastern San Diego County
11. SAN GABRIEL MOUNTAINS - northern Los Angeles County - Angeles National Forest
12. San Jacinto Mountains - above Palm Springs
13. San Joaquin Hills - coastal Orange County
14. San Jose Hills - Los Angeles County (San Dimas)
15. San Leandro Hills - eastern side of San Francisco Bay
16. San Marcos Mountains - northwestern San Diego County
17. San Rafael Hills - Los Angeles County (adjacent to San Gabriel Valley)
18. San Rafael Mountains - Santa Barbara County (Los Padres National Forest)
19. San Timoteo Badlands - Riverside County
20. San Ysidro Mountains - southern San Diego County
21. Sand Hills - Yuba County
22. Santa Ana Mountains - Southern California (Peninsular Range)
23. Santa Cruz Mountains - Pacific Coast Range (northern & central California)
24. SANTA LUCIA RANGE - Central Coast (San Luis Obispo County)
25. Santa Margarita Mountains - north coast San Diego County
26. Santa Monica Mountains - Los Angeles County (Transverse Range)
27. Santa Rosa Hills - Inyo County (Saline Valley)
28. Santa Rosa Hills - Riverside County (SE of Hemet)
29. Santa Rosa Mountains - west of Coachella Valley
30. Santa Susana Mountains - north of Los Angeles city
31. Santa Teresa Hills - Santa Clara County
32. Santa Ynez Mountains - mainly in Santa Barbara County
33. Sawtooth Range - eastern San Diego County
34. Sawtooth Range - Mojave Desert (east of Lanfair Valley)
35. Scodie Mountains - Kern County (sub-mountain range in southern Sierra Nevada)
36. Scott Bar Mountains - Siskiyou County
37. Scott Mountains - Siskiyou County (subrange of Klamath Mountains)
38. SEVEN SISTERS - San Luis Obispo County (Morro Bay toward San Luis Obispo)
39. Shadow Mountains - Mojave Desert
40. Shale Hills - western Kern County
41. Shandin Hills - San Bernardino city
42. Sheep Hills - Orange County
43. Sheep Hole Mountains - north of Joshua Tree NP
44. Shelton Buttes - Humboldt County
45. Sherburne Hills - Contra Costa County
46. Ship Mountains - San Bernardino County
47. Sierra Azul - Santa Clara County
48. Sierra de Salinas - central Monterey County
49. Sierra Madre - northern Santa Barbara County
50. SIERRA NEVADA - western United States
51. Sierra Pelona (Ridge) - northwest Los Angeles County
52. Silurian Hills - Mojave Desert (southeast of Death Valley NP)
53. Simi Hills - eastern Ventura County
54. Siskiyou Mountains - coasta subrange of the Klamath Mountains
55. Skedaddle Mountains - Lassen County
56. Slate Range - Mojave Desert (east of Trona)
57. Soda Mountains - Mojave Desert (west of Baker)
58. Solomon Hills - northern Santa Barbara County
59. Sonoma Mountains - Sonoma County
60. South Hills - San Gabriel Valley
61. Spangler Hills - Mojave Desert (east of Ridgecrest)
62. Sperry Hills - Mojave Desert (south of Shoshone) 64. Summit Range - Mojave Desert (Fremont Valley)
65. Superstition Hills - Imperial Valley
66. Sweetwater Mountains - Mono County
67. Sweitzer Hills - Yolo County
68. Sylvania Mountains - Inyo County (and into Nevada)