| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Kachess Resort | city | Washington | United States | 47.33 | -121.25 | 2509 | |
| Kahlotus | city | Washington | United States | 46.64 | -118.56 | 1000 | |
| Kalaloch | city | Washington | United States | 47.60 | -124.37 | 19 | |
| Kalama | city | Washington | United States | 46.01 | -122.84 | 180 | |
| Kamilche | city | Washington | United States | 47.13 | -123.10 | 200 | |
| Kanaskat | city | Washington | United States | 47.32 | -121.89 | 997 | |
| Kanaskat Junction | city | Washington | United States | 47.33 | -121.89 | 1072 | |
| Kangley | city | Washington | United States | 47.36 | -121.88 | 1669 | |
| Kapowsin | city | Washington | United States | 46.99 | -122.23 | 830 | |
| Karamin | city | Washington | United States | 48.77 | -118.65 | 2509 | |
| Kariotis | city | Washington | United States | 47.63 | -122.61 | 311 | |
| Kariotis Mobile Estates | city | Washington | United States | 47.62 | -122.61 | 311 | |
| Karwin Village Mobile Home Park | city | Washington | United States | 47.18 | -122.47 | 298 | |
| Keller | city | Washington | United States | 48.08 | -118.69 | 1669 | |
| Kellogg Village Mobile Home Park | city | Washington | United States | 48.09 | -122.15 | 108 | |
| Kellys Korner | city | Washington | United States | 46.98 | -122.77 | 242 | |
| Kelso | city | Washington | United States | 46.15 | -122.91 | 180 | |
| Kendall | city | Washington | United States | 48.92 | -122.14 | 830 | |
| Kenilworth | city | Washington | United States | 47.63 | -122.11 | 200 | |
| Kenmore | city | Washington | United States | 47.76 | -122.24 | 157 | |
| Kennard Corner | city | Washington | United States | 47.82 | -122.21 | 200 | |
| Kennard Mobile Estates | city | Washington | United States | 47.82 | -122.20 | 265 | |
| Kennewick | city | Washington | United States | 46.21 | -119.14 | 400 | |
| Kennydale | city | Washington | United States | 47.52 | -122.21 | 29 | |
| Kenova | city | Washington | United States | 47.21 | -117.55 | 2509 | |
| Kent | city | Washington | United States | 47.38 | -122.23 | 187 | |
| Kenwood | city | Washington | United States | 47.73 | -122.30 | 226 | |
| Kerriston | city | Washington | United States | 47.45 | -121.86 | 1669 | |
| Ketron | city | Washington | United States | 47.15 | -122.62 | 301 | |
| Kettle Falls | city | Washington | United States | 48.61 | -118.06 | 1669 | |
| Kewa | city | Washington | United States | 48.20 | -118.28 | 1889 | |
| Key Center | city | Washington | United States | 47.34 | -122.75 | 200 | |
| Keyport | city | Washington | United States | 47.70 | -122.62 | 3 | |
| Keystone | city | Washington | United States | 48.16 | -122.63 | 0 | |
| Keystone | city | Washington | United States | 47.24 | -118.15 | 1961 | |
| Keystone | city | Washington | United States | 48.56 | -119.48 | 1669 | |
| Keystone Ferry Landing | city | Washington | United States | 48.16 | -122.67 | 0 | |
| Kibler | city | Washington | United States | 46.09 | -118.22 | 1669 | |
| Kickerville | city | Washington | United States | 48.89 | -122.70 | 213 | |
| Kid Valley | city | Washington | United States | 46.37 | -122.62 | 830 | |
| Killarney Woods Mobile Home Park | city | Washington | United States | 47.27 | -122.30 | 298 | |
| King Corner | city | Washington | United States | 45.79 | -122.60 | 223 | |
| King Hill | city | Washington | United States | 48.04 | -123.27 | 1062 | |
| King's Mobile Home Court | city | Washington | United States | 47.82 | -122.26 | 400 | |
| Kingsbury East Mobile Home Park | city | Washington | United States | 47.84 | -122.29 | 830 | |
| Kingsbury West Mobile Home Park | city | Washington | United States | 47.84 | -122.30 | 830 | |
| Kingsgate | city | Washington | United States | 47.73 | -122.18 | 200 | |
| Kingston | city | Washington | United States | 47.80 | -122.50 | 0 | |
| Kinneyville (historical) | city | Washington | United States | 46.21 | -119.79 | 830 | |
| Kiona | city | Washington | United States | 46.25 | -119.48 | 830 | |
| Kirby | city | Washington | United States | 46.51 | -117.39 | 2509 | |
| Kirkland | city | Washington | United States | 47.68 | -122.21 | 75 | |
| Kirklandas | city | Washington | United States | 47.68 | -122.21 | 75 | |
| Kitsap Lake | city | Washington | United States | 47.58 | -122.71 | 200 | |
| Kitsap Lake Mobile Home Park | city | Washington | United States | 47.56 | -122.70 | 301 | |
| Kitsap West Mobile Home Court | city | Washington | United States | 47.48 | -122.61 | 213 | |
| Kittitas | city | Washington | United States | 46.98 | -120.42 | 1669 | |
| Kitts Corner | city | Washington | United States | 47.30 | -122.31 | 321 | |
| Kitzmiller | city | Washington | United States | 46.76 | -117.17 | 2598 | |
| Klaber | city | Washington | United States | 46.56 | -123.13 | 400 | |
| Klahanie | city | Washington | United States | 47.43 | -122.44 | 0 | |
| Klaus | city | Washington | United States | 46.58 | -122.84 | 400 | |
| Klickitat | city | Washington | United States | 45.82 | -121.15 | 1115 | |
| Klickitat Heights | city | Washington | United States | 45.78 | -121.32 | 2509 | |
| Klickitat Springs | city | Washington | United States | 45.82 | -121.12 | 830 | |
| Klipsan Beach | city | Washington | United States | 46.47 | -124.05 | 22 | |
| Klipsan Meadows Park | city | Washington | United States | 46.47 | -124.04 | 9 | |
| Kloshe Illahee Mobile Home Park | city | Washington | United States | 47.27 | -122.30 | 351 | |
| Knapp | city | Washington | United States | 45.74 | -122.73 | 177 | |
| Knappton | city | Washington | United States | 46.28 | -123.81 | 0 | |
| Koontzville | city | Washington | United States | 48.02 | -118.95 | 1066 | |
| Kooskooskie | city | Washington | United States | 46.01 | -118.12 | 2086 | |
| Kopiah | city | Washington | United States | 46.71 | -122.81 | 400 | |
| Koren | city | Washington | United States | 46.80 | -119.02 | 1227 | |
| Kosmos (historical) | city | Washington | United States | 46.50 | -122.19 | 830 | |
| Krain | city | Washington | United States | 47.24 | -121.99 | 830 | |
| Kruse | city | Washington | United States | 48.10 | -122.18 | 49 | |
| Kruse Junction | city | Washington | United States | 48.10 | -122.18 | 49 | |
| Kulshan | city | Washington | United States | 48.84 | -122.14 | 347 | |
| Kulzer | city | Washington | United States | 48.15 | -117.72 | 1952 | |
| Kummer | city | Washington | United States | 47.29 | -122.02 | 390 | |
| Kumtux | city | Washington | United States | 45.79 | -122.52 | 321 |