# HA4

6 sectors, 1,138 postcodes

- **Part of:** [HA](https://openpostcodes.uk/HA)
- **Local authorities:** Hillingdon, Harrow

## Sectors

| Sector | Postcodes | Local authority |
|---|---|---|
| [HA4 0](https://openpostcodes.uk/HA4%200) | 219 | Hillingdon |
| [HA4 4](https://openpostcodes.uk/HA4%204) | 15 | Hillingdon |
| [HA4 6](https://openpostcodes.uk/HA4%206) | 225 | Hillingdon |
| [HA4 7](https://openpostcodes.uk/HA4%207) | 256 | Hillingdon |
| [HA4 8](https://openpostcodes.uk/HA4%208) | 221 | Hillingdon |
| [HA4 9](https://openpostcodes.uk/HA4%209) | 202 | Hillingdon |