| Lake | County | Latitude | Longitude |
| Kalmia Lake | Trinity | 40.988561 | -123.031926 |
| Kangaroo Lake | Siskiyou | 41.334028 | -122.634967 |
| Karls Lake | Tuolumne | 38.145971 | -119.762280 |
| Keller Lake | Glenn | 39.719425 | -122.890114 |
| Kelley Reservoir | Modoc | 41.527705 | -120.692606 |
| Kelsey Reservoir | Merced | 37.541247 | -120.354152 |
| Kennedy Lake | Tuolumne | 38.260473 | -119.654673 |
| Kent Lake | Marin | 37.979773 | -122.684745 |
| Kerckhoff Lake | Fresno | 37.139076 | -119.515679 |
| Kern Lake | Tulare | 36.316083 | -118.404734 |
| Kerr Lake | San Luis Obispo | 35.775251 | -120.360047 |
| Keystone Lake | San Joaquin | 37.685529 | -121.278051 |
| Kibbie Lake | Tuolumne | 38.053050 | -119.845420 |
| Kidd Lake | Placer | 39.310246 | -120.427879 |
| Kidney Lake | Mono | 37.897419 | -119.198054 |
| Kilborn Lake | Nevada | 39.317782 | -120.415480 |
| Kimball Reservoir | Napa | 38.622907 | -122.613795 |
| Kingsley Lake | Tehama | 40.033215 | -122.943568 |
| Kinney Reservoir | Alpine | 38.554418 | -119.810117 |
| Kirman Lake | Mono | 38.340096 | -119.499041 |
| Kittridge Lake | Santa Clara | 37.190195 | -122.014320 |
| Klondike Lake | Inyo | 37.207110 | -118.304506 |
| Koenig Lake | Mono | 38.281475 | -119.628500 |
| Kopta Slough | Tehama | 39.915501 | -122.096888 |
| Kuna Lake | Tuolumne | 37.851513 | -119.252573 |
| Kunkle Reservoir | Butte | 39.714676 | -121.574054 |
| Kutras Lake | Shasta | 40.578923 | -122.367618 |