(based on 1999 population census)
| Ethnic groups | Population size by ethnic groups. thsd. person | Of which with national language of use. percent | Language spoken fluently by population. percent |
| national language of use | azeirbaijan | russian | english |
| Total population | 7953.4 | 99 | 99.2 | 4.2 | 9.3 | 0.3 |
| of which:
| | azerbaijanians | 7205.5 | 99.7 | 99.8 | - | 8.2 | 0.3 |
| lezgi | 178 | 96.1 | 97 | 66.4 | 32.5 | 0.3 |
| russians | 141.7 | 99.3 | 99.7 | 16.6 | - | 1.2 |
| armenians | 120.7 | 99.9 | 99.9 | 0.4 | 0.3 | 0 |
| talish | 76.8 | 89.6 | 97.5 | 79.9 | 5.4 | 0.1 |
| avars | 50.9 | 98.2 | 98.8 | 71.4 | 23.9 | 0.2 |
| turkish | 43.4 | 94.6 | 95.4 | 41.2 | 14.4 | 0.2 |
| tatarian | 30 | 86.7 | 87.5 | 74.9 | 83.7 | 0.4 |
| ukrainians | 29 | 32.1 | 32.4 | 10.7 | 77.9 | 1.5 |
| sakhur | 15.9 | 99.3 | 99.4 | 82.9 | 14.3 | 0.2 |
| georgians | 14.9 | 98 | 98.3 | 63 | 26.4 | 0.3 |
| kurds | 13.1 | 48.9 | 57 | 87.6 | 4.2 | 0.1 |
| tats | 10.9 | 83 | 89.6 | 67.8 | 21.7 | 0.3 |
| jews | 8.9 | 87.1 | 88.2 | 58.4 | 66.4 | 1.4 |
| udins | 4.1 | 98.8 | 99.2 | 49.4 | 68.3 | 0.1 |
| other nationalities | 9.6 | 75.3 | 41.6 | 53.1 | 45 | 2.4 |
| 1) Everybody defermined nationality themself.
Information on children are obtained from the parents.
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