A khoroo is an administrative subdivision of Ulaanbaatar

Ulaanbaatar

Ulan Bator or Ulaanbaatar is the capital and largest city of Mongolia. An independent municipality, the city is not part of any province, and its population as of 2008 is over one million....

, the capital of Mongolia

Mongolia

Mongolia is a landlocked country in East and Central Asia. It is bordered by Russia to the north and China to the south, east and west. Although Mongolia does not share a border with Kazakhstan, its western-most point is only from Kazakhstan's eastern tip. Ulan Bator, the capital and largest...

. The term is often translated as subdistrict

Subdistrict

Subdistrict is a low level administrative division of a country. In Thailand it may refer to the King Amphoe or to the Tambon. In England and Wales it was part of a Registration district....

 or microdistrict

Microdistrict

Microdistrict, or microraion , is a residential complex—a primary structural element of the residential area construction in the Soviet Union and in some post-Soviet and former Communist states...

, although the latter might lead to confusion with khoroolol

Khoroolol

Khoroolol is the Mongolian equivalent for neighbourhood or, in densely-built residential areas, for the Russian mikrorayon. In Ulaanbaatar, the apartment khoroolols built during socialist times carry numbers between one and nineteen, though some are named after higher numbers like 40,000 and...

s. A khoroo is below the level of a düüreg

Düüreg

A düüreg is a municipal district in the capital of Mongolia, Ulaanbaatar. Each of the nine düüregs is subdivided into khoroos.Each düüreg also serves as a constituency that elects one or more representatives into the State Great Khural, the national parliament.Although administratively part of...

(district).

There were 121 khoroo until 2007, when the number increased to 132 . Each khoroo has an identifying number within its düüreg, although some may also have a name (e.g. Narnii zam 13 or Rashaantiin 18).