# Ust-Orda Buryat Okrug

Ust-Orda Buryat Okrug, or Ust-Orda Buryatia, is an administrative division of Irkutsk Oblast, Russia. It was a federal subject of Russia (an autonomous okrug of Irkutsk Oblast) from 1993 to January 1, 2008, when it merged with Irkutsk Oblast. It also had autonomous okrug status from September 26, 1937 to 1993. Prior to the merger, it was called Ust-Orda Buryat Autonomous Okrug (Усть-Орды́нский Буря́тский автоно́мный о́круг). It is one of the two Buryat okrugs in Russia, the other one is Agin-Buryat Okrug in Zabaykalsky Krai.
It has an area of 22,138.1 square kilometers (8,547.6 sq mi). Population: 125,177 (2010 Census).
The settlement of Ust-Ordynsky is the autonomous okrug's administrative center and its most populous inhabited locality.

## Merger

In a referendum held on April 16, 2006, the majority of residents in Irkutsk Oblast and Ust-Orda Buryat Autonomous Okrug agreed to the unification of the two regions. According to regions' electoral commissions, 68.98% of residents of Irkutsk Oblast and 99.51% of residents in Ust-Orda Buryatia took part in the vote, making it one of the best attended plebiscites in the country since the 2003 Russian election. The merger was approved by an absolute majority of the electorate: by 89.77% in Irkutsk Oblast and by 97.79% in Ust-Orda Buryatia. The enlarged Irkutsk Oblast has officially come into existence on January 1, 2008.

## Administrative divisions

The okrug is divided into six administrative districts:
* Alarsky District
* Bayandayevsky District
* Bokhansky District
* Ekhirit-Bulagatsky District
* Nukutsky District
* Osinsky District

## Demographics

* Population: 125,177 (2010 Census); 135,327 (2002 Census); 136,306 (1989 Soviet census).

### Vital statistics

    Source: Russian Federal State Statistics Service
| | Average population (x 1000) | Live births | Deaths | Natural change | Crude birth rate (per 1000) | Crude death rate (per 1000) | Natural change (per 1000) |
| 1970 | 146 | 2,813 | 1,175 | 1,638 | 19.3 | 8.0 | 11.2 |
| 1975 | 138 | 3,014 | 1,311 | 1,703 | 21.8 | 9.5 | 12.3 |
| 1980 | 132 | 3,193 | 1,346 | 1,847 | 24.2 | 10.2 | 14.0 |
| 1985 | 132 | 3,546 | 1,397 | 2,149 | 26.9 | 10.6 | 16.3 |
| 1990 | 128 | 3,383 | 1,325 | 2,058 | 26.5 | 10.4 | 16.1 |
| 1991 | 129 | 3,101 | 1,424 | 1,677 | 24.0 | 11.0 | 13.0 |
| 1992 | 131 | 2,770 | 1,560 | 1,210 | 21.1 | 11.9 | 9.2 |
| 1993 | 132 | 2,379 | 1,742 | 637 | 18.0 | 13.2 | 4.8 |
| 1994 | 132 | 2,385 | 1,943 | 442 | 18.1 | 14.7 | 3.4 |
| 1995 | 132 | 2,186 | 1,872 | 314 | 16.5 | 14.2 | 2.4 |
| 1996 | 133 | 2,155 | 1,704 | 451 | 16.2 | 12.8 | 3.4 |
| 1997 | 134 | 2,010 | 1,787 | 223 | 15.0 | 13.3 | 1.7 |
| 1998 | 134 | 2,011 | 1,654 | 357 | 15.0 | 12.3 | 2.7 |
| 1999 | 135 | 2,018 | 1,923 | 95 | 15.0 | 14.3 | 0.7 |
| 2000 | 135 | 1,932 | 2,004 | - 72 | 14.3 | 14.9 | -0.5 |
| 2001 | 135 | 1,986 | 1,967 | 19 | 14.7 | 14.6 | 0.1 |
| 2002 | 135 | 2,011 | 2,004 | 7 | 14.9 | 14.9 | 0.1 |
| 2003 | 134 | 1,986 | 2,023 | - 37 | 14.9 | 15.1 | -0.3 |
| 2004 | 132 | 2,058 | 2,174 | - 116 | 15.6 | 16.5 | -0.9 |
| 2005 | 130 | 1,968 | 2,138 | - 170 | 15.1 | 16.4 | -1.3 |
| 2006 | 128 | 2,142 | 1,867 | 275 | 16.7 | 14.6 | 2.1 |
| 2007 | 127 | 2,433 | 1,653 | 780 | 19.1 | 13.0 | 6.1 |
| 2008 | 126 | 2,827 | 1,719 | 1,108 | 22.4 | 13.6 | 8.8 |
| 2009 | 126 | 2,906 | 1,648 | 1,258 | 23.1 | 13.1 | 10.0 |
| 2010 | 125 | 2,785 | 1,771 | 1,014 | 22.3 | 14.2 | 8.1 |

### Ethnic groups

Of the 135,327 residents (as of the 2002 Census), 38 (0.02%) chose not to specify their ethnic background. Of the rest, residents identified themselves as belonging to 74 ethnic groups, including Russians (54.4%), Buryats (39.6%), Tatars (3%) and Ukrainians (0.96%)
| Ethnic group | 1959 Census | 1959 Census | 1970 Census | 1970 Census | 1979 Census | 1979 Census | 1989 Census | 1989 Census | 2002 Census | 2002 Census | 2010 Census | 2010 Census | 2020 Census | 2020 Census |
| Ethnic group | Number | % | Number | % | Number | % | Number | % | Number | % | Number | % | Number | % |
| Buryats | 44,850 | 33.7% | 48,302 | 33.0% | 45,436 | 34.4% | 49,298 | 36.3% | 53,649 | 39.6% | 49,871 | 39.8% | 50,519 | 41.4% |
| Russians | 75,099 | 56.4% | 86,020 | 58.8% | 76,731 | 58.1% | 76,827 | 56.5% | 73,646 | 54.4% | 67,808 | 54.2% | 66,587 | 54.5% |
| Others | 13,122 | 9.9% | 12,090 | 8.3% | 9,986 | 7.6% | 9,745 | 7.2% | 8,032 | 5.9% | 7,498 | 6.0% | 4,961 | 4.1% |