| District | Count of Postal Codes |
|---|---|
| Baksa | 129 |
| Barpeta | 187 |
| Biswanath | 93 |
| Bongaigaon | 69 |
| Cachar | 283 |
| Charaideo | 73 |
| Chirang | 65 |
| Darrang | 73 |
| Dhemaji | 94 |
| Dhubri | 127 |
| Dibrugarh | 218 |
| Dima Hasao | 74 |
| Goalpara | 103 |
| Golaghat | 145 |
| Hailakandi | 98 |
| Hojai | 76 |
| Jorhat | 187 |
| Kamrup | 201 |
| Kamrup Metro | 78 |
| Karbi Anglong | 95 |
| Karimganj | 161 |
| Kokrajhar | 104 |
| Lakhimpur | 167 |
| Majuli | 57 |
| Marigaon | 96 |
| Nagaon | 212 |
| Nalbari | 149 |
| Sivasagar | 173 |
| Sonitpur | 126 |
| South Salmara Mancachar | 27 |
| Tinsukia | 142 |
| Udalguri | 99 |
| West Karbi Anglong | 30 |
| Baksa |
| Barpeta |
| Biswanath |
| Bongaigaon |
| Cachar |
| Charaideo |
| Chirang |
| Darrang |
| Dhemaji |
| Dhubri |
| Dibrugarh |
| Dima Hasao |
| Goalpara |
| Golaghat |
| Hailakandi |