year of construction of the building in which the apartment is located. Timeline 3 April 2021: Law on the Census of Population, Households and Apartments in the Republic of Croatia in 2021 entered into force 13–26 September 2021: citizens could be registered independently using the census questionnaire in electronic form that was available on the e-Citizens portal, simultaneously listing the household and the apartment in which they live 27 September – 14 November 2021: enumerators used electronic devices to enumerate all census units that were not self-enumerated and controlled the data collected by self-enumeration 22 September 2022: the final results of the Census 2021 have been published County rankings A population decline was recorded in each of 20 counties and the City of Zagreb. The biggest decline in apsolute numbers was in Osijek-Baranja County, which lost 47,006 inhabitants, while the relative decrease was the strongest in Vukovar-Srijem and Sisak-Moslavina County, at 20.3 and 19.0 percent respectively. The 2020 Petrinja earthquake caused a lot of damage in Sisak-Moslavina County. On the other hand, Zagreb had a large influx of citizens from other parts of Croatia, giving it the smallest relative change. City rankings 2021 Census showed decrease of population in all ten biggest cities with Zagreb staying the largest and followed by Split, most populated city in the south, Rijeka, most populated city in the west and Osijek, most populated city in the east. Population by ethnicity and religion Census information with a number of Croats and 22 official recognized minorities of Croatia. Census also included religion with a connection to nations of Croatia. Population by first language Croatian citizens by first language, including non-official recognized Serbo-Croatian and Croato-Serbian: Population by sex and age structure Sex and age structure of the population of Croatia: References 2021 censuses Demographics of Croatia