If you are sending a parcel towards the French overseas, Colissimo country codes are specific. Do not use FR as country code. It will not work and give an error message. Please use instead the following country and postal codes:
| French oversea territory | Colissimo mandatory country code | Postal codes range |
| Guadeloupe | GP | 97100 – 97132 97134 – 97148 97151 – 97199 |
| Saint Martin | MF | 97024 – 97024 97051 – 97080 97149 – 97150 |
| Saint Barthelemy | BL | 97012 – 97022 97049 – 97049 97095 – 97099 97133 – 97133 |
| Martinique | MQ | 97200 – 97299 |
| Guyanne Francaise | GF | 97300 – 97399 |
| La Reunion | RE | 97400 – 97490 97820 – 97899 |
| Mayotte | YT | 97600 – 97690 |
| Saint Pierre et Miquelon | PM | 97500 – 97500 |
