| Local Authority | Codes |
|---|---|
Oadby and Wigston |
2440 |
Oldham |
4220 |
Orkney Islands |
9000 |
Omagh |
7125 |
Oswestry |
3215 |
Oxford |
3110 |
Oxfordshire, South |
3115 |
Oxfordshire, West |
3125 |
