The city of Luhansk (Ukrainian: Луганськ, IPA: [ɫuˈɦɑnʲsʲk]) or Lugansk (Russian: Луганск; IPA: [lʊˈgansk]), formerly known as Voroshilovgrad (1935-1958 and 1970-1990), functions as the administrative center of Luhansk Oblast in easternmost Ukraine. The city itself is also designated as its own separate municipality within the oblast. As of 2013 it had an estimated population of around 425,848.