| Locality | Postal Code |
|---|---|
| Kirbyunderdale | YO41 |
| Kirk Ella | HU10 |
| Kirkburn | YO25 |
| Knedlington | DN14 7EU |
| Langtoft | YO25 |
| Laxton | DN14 |
| Laytham | YO42 |
| Leconfield | HU17 |
| Lelley | HU12 |
| Leven | HU17 |
| Lissett | YO25 |
| Little Driffield | YO25 |
| Little Hatfield | HU11 4UZ |
| Little Kelk | YO25 |
| Little Reedness | DN14 8HQ |
| Little Weighton | HU20 |
| Lockington | YO25 |
| Londesborough | YO43 |
| Long Riston | HU11 |
| Low Catton | YO41 |
| Low Gardham | HU17 |
| Low Hunsley | HU20 3UP |
| Lowthorpe | YO25 |
| Lund | YO25 |
| Mappleton | HU18 |
| Market Weighton | YO43 |