| population | |
| Amphoe Ban Dung | 99759 |
| Amphoe Ban Phue | 89610 |
| Amphoe Chai Wan | 31290 |
| Amphoe Ku Kaeo | 18614 |
| Amphoe Kumphawapi | 100109 |
| Amphoe Kut Chap | 55425 |
| Amphoe Mueang Udon Thani | 347497 |
| population | |
| Amphoe Na Yung | 23115 |
| Amphoe Nam Som | 46692 |
| Amphoe Non Sa-at | 40095 |
| Amphoe Nong Han | 91404 |
| Amphoe Nong Saeng | 21902 |
| Amphoe Nong Wua So | 49990 |
| Amphoe Phen | 94888 |
| population | |
| Amphoe Phibun Rak | 19347 |
| Amphoe Prachak Sinlapakhom | 19940 |
| Amphoe Sang Khom | 23227 |
| Amphoe Si That | 42713 |
| Amphoe Thung Fon | 25724 |
| Amphoe Wang Sam Mo | 47025 |
 | Udorn Air Base | ~ 6.56 km |
| Udon Thani Airport | ~ 7.61 km |
 | Wattay International Airport | ~ 78.26 km |
| Khon Kaen Airport | ~ 96.52 km |
| Loei Airport | ~ 118.51 km |
| Sakon Nakhon Airport | ~ 137.38 km |
| Roi Et Airport | ~ 168.32 km |
| Phetchabun Airport | ~ 188.92 km |
| Nakhon Phanom Airport | ~ 192.14 km |
