| En Name: | Ust-Aldansky District |
| Ru Name: | Усть-Алданский улус |
| Loc Name1: | Уус-Алдан улууhа |
| Loc Lang1: | Sakha |
| Image View: | 431 Ленский историко-архитектурный музей-заповедник «Дружба».jpg |
| Coordinates: | 58.6667°N 146°W |
| Image Coa: | Coat of Arms of Ust-Aldansky rayon (Yakutia).png |
| Federal Subject: | Sakha Republic |
| Adm Data As Of: | June 2009 |
| Adm Ctr Type: | selo |
| Adm Ctr Name: | Borogontsy |
| Selsoviet Type1: | Rural okrugs |
| No Of Selsoviets Type1: | 21 |
| No Of Rural Localities: | 35 |
| Mun Data As Of: | December 2008 |
| Mun Formation1: | Ust-Aldansky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 0 |
| Mun Formation1 No Of Rural Settlements: | 21 |
| Mun Formation1 Counts Ref: | [1] |
| Area As Of: | June 2009 |
| Area Km2: | 18300 |
| Pop 2010Census: | 22155 |
| Urban Pop 2010Census: | 0% |
| Rural Pop 2010Census: | 100% |
| Established Date: | January 9, 1930 |
| Date: | March 2013 |
Ust-Aldansky District (Russian: link=no|Усть-Алда́нский улу́с; Yakut: Уус-Алдан улууһа, Uus-Aldan uluuha, pronounced as /uːs-aldan uluːha/) is an administrative[2] and municipal[3] district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia. It is located in the center of the republic and borders with Kobyaysky District in the north, Tomponsky District in the northeast, Tattinsky District in the east, Churapchinsky District in the southeast, Megino-Kangalassky District in the south, and with Namsky District in the west. The area of the district is 18300km2.[4] Its administrative center is the rural locality (a selo) of Borogontsy. Population: 22,372 (2002 Census); The population of Borogontsy accounts for 23.6% of the district's total population.
The landscape of the district is mostly flat. Its main rivers include the Lena and the Aldan.[5] There are many lakes in the district, the largest of which are Lakes Myuryu, Oner, and Targyldzhyma.
The district was established on January 9, 1930.
As of the 2021 Census, the ethnic composition was as follows:[6]
98.9%
0.6%
0.2%
The economy of the district is mostly based on agriculture.
| Rural settlements | Population | Male | Female | Rural localities in jurisdiction* |
|---|---|---|---|---|
| Batagaysky Nasleg (Russian: Батагайский) | 542 | 261 (48.2%) | 281 (51.8%) |
|
| Bayagantaysky Nasleg (Russian: Баягантайский) | 699 | 350 (50.1%) | 349 (49.9%) |
|
| Bert-Usovsky Nasleg (Russian: Берт-Усовский) | 783 | 380 (48.5%) | 403 (51.5%) |
|
| Borogonsky Nasleg (Russian: Борогонский) | 1,009 | 506 (50.1%) | 503 (49.9%) | |
| Byariyinsky Nasleg (Russian: Бярийинский) | 297 | 159 (53.5%) | 138 (46.5%) |
|
| Dyupsyunsky Nasleg (Russian: Дюпсюнский) | 1,536 | 752 (49.0%) | 784 (51.0%) | |
| Kurbusakhsky Nasleg (Russian: Курбусахский) | 1,105 | 562 (50.9%) | 543 (49.1%) |
|
| Legyoysky Nasleg (Russian: Легёйский) | 1,527 | 719 (47.1%) | 808 (52.9%) |
|
| Legyoysky 2-y Nasleg (Russian: Легёйский 2-й) | 614 | 285 (46.4%) | 329 (53.6%) |
|
| Myuryunsky Nasleg (Russian: Мюрюнский) | 6,015 | 2,813 (46.8%) | 3,202 (53.2%) |
|
| Nayakhinsky Nasleg (Russian: Наяхинский) | 1,020 | 504 (49.4%) | 516 (50.6%) |
|
| Oltyokhsky Nasleg (Russian: Ольтёхский) | 1,040 | 502 (48.3%) | 538 (51.7%) | |
| Onyorsky Nasleg (Russian: Онёрский) | 616 | 298 (48.4%) | 318 (51.6%) |
|
| Ospyokhsky Nasleg (Russian: Оспёхский) | 319 | 156 (48.9%) | 163 (51.1%) |
|
| Ospyokhsky 1-y Nasleg (Russian: Оспёхский 1-й) | 534 | 270 (50.6%) | 264 (49.4%) |
|
| Suottunsky Nasleg (Russian: Суоттунский) | 1,929 | 938 (48.6%) | 991 (51.4%) |
|
| Tit-Arynsky Nasleg (Russian: Тит-Арынский) | 238 | 143 (49.7%) | 145 (50.3%) |
|
| Tyulyakhsky Naleg (Russian: Тюляхский) | 538 | 269 (50.0%) | 269 (50.0%) |
|
| Khorinsky Nalseg (Russian: Хоринский) | 593 | 276 (46.5%) | 317 (53.5%) |
|
| Khorinsky 1-y Nalseg (Russian: Хоринский 1-й) | 664 | 316 (47.6%) | 348 (52.4%) |
|
| Cherikteysky Nasleg (Russian: Чериктейский) | 487 | 235 (48.3%) | 252 (51.7%) |
|