Order of the NIS President no. 1174/30.12.2013
●Law no.119/1996 on civil status documents, republished in 2012, with subsequent amendments;
●Act (Government Emergency Ordinance - GEO) no.97/2005 on the records, domicile, residence and identity documents of Romanian citizens, republished in 2011;
●Act (GEO) no.194/2002 on foreigners in Romania, republished, with subsequent amendments; 
●Act (GEO) no.102/2005 on the free movement of citizens of member states of the European Union and European Economic Area and the Swiss Confederation citizens on Romanian territory , republished;
●Law no.248/2005 on the free movement of Romanian citizens abroad, with subsequent amendments

Regulation (EC) no. 862/2007 of the European Parliament and of the Council of 11 July 2007 on Community statistics on migration and international protection
Regulation (EU) No 1260/2013 of the European Parliament and of the Council of 20 November 2013 on European demographic statistics -Commission Implementing Regulation (EU) No 205/2014 of 4 March 2014 laying down uniformed conditions for the implementation of Regulation (EU) No 1260/2013 of the European Parliament and the Council on European demographic statistics, as regards breakdowns of data, deadlines and data revisions

Estimate the usually resident population during the period between censuses

All persons of Romanian nationality, foreign or stateless who have their usual residence in Romania for a period of at least 12 months. 
The resident population of Romania consists of:
 - the persons regardless of citizenship having their usual residence in Romania; 
 - the persons of Romanian citizenship who live abroad for less than 12 months (border and seasonal workers, people  left for studies, for medical treatment or tourism purposes, etc..)
 - the persons of foreign citizenship, settled in Romania for a period of at least 12 months (including the staff2 of European Union institutions and of international civil organizations located in the geographical territory of the country);
 - the military of foreign citizenship2 working with the international organizations located in the geographical territory of Romania for a period of at least 12 months;
 - the technical support staff of foreign citizenship2 on duty to Romania for a period of at least 12 months, which is considered employed by the Romanian Government on behalf of the Government or the international organization that actually finances its activity;
 - the members2 of national armed forces deployed in the rest of the world; 
 - the national staff2 of national scientific bases outside the geographical territory of the country;
 - the national diplomatic personnel posted abroad; 
 - the persons of Romanian citizenship2 which are crews members of the fishing vessels, other vessels, aircraft and floating platforms operating partly or entirely outside the economic territory;
 - the refugees (persons granted international protection) on the basis of "intended stay" from country's perspective.

National, macroregions, development regions, counties and areas of residence.

Population census; Statistical demographic data  from the NIS for vital statistics; Administrative sources (MIA) for the internal and international migration and a econometric model based on estimation techniques by small areas, to determine the number of emigrants (persons from Romania who changed their usual residence in other countries).

Population census; Statistical demographic data  from the NIS for vital statistics; Administrative sources (MIA) for the internal and international migration and a econometric model based on estimation techniques by small areas, to determine the number of emigrants (persons from Romania who changed their usual residence in other countries).

Methodology of usually resident population of Romania

Methodology of usually resident population of Romania

For 2002-2011 period, the usually resident population was re-estimated under comparability conditions with the final results of the Population and Housing Census of 2011.
Beginning with the Population and Housing Census - 2011, Romania's usually resident population is based on the idea of computing the demographic events under the usual residence definition and adding this information to the usually residence population of the previous reference date.

For the demographic events, the statistical survey is exhaustive, the data collection being done with the information support outlined by the NIS ( for vital statistics) and by the MIA ( for the population migration). The experts of the NIS draw up the birth and death demographic statistical bulletins approved by the MIA (in accordance with the Law of the civil status documents, Art. 70-2). The data are collected as follows: monthly for the demographic events and biannually for internal and international migration.