According to the updated census results from 2011, the official number of inhabitants for the city of Bonn at the end of 2021 is 331,885. Compared to the end of 2020, the population has increased by 1,306 inhabitants or 0.4 percent.

As in the past, the population growth can be based on a positive balance of people moving in and out: As a result, Bonn was able to gain a total of 1,384 inhabitants in 2021. IT.NRW refers here to methodological changes and the switch to a new statistical processing method in migration statistics. The natural population movement, i.e. the balance of births and deaths, has been consistently positive in Bonn since 1987 and in 2021 there will also be an increase of around 249 inhabitants.

Parallel to the collection of official figures by IT.NRW, the statistics office of the city of Bonn generates the "municipal" population figures on the basis of the civil register. At the end of 2021, the statistics office counts a total of 335,975 Bonn residents with sole or main residence in the city according to statistical analysis of the civil register data. Compared to the previous year, the population has increased by +2,181 persons, which corresponds to a growth of approximately +0.7 percent.

The current population figure does not include a total of 1,995 people who were living in a transitional or initial reception facility for migrants run by the state of North Rhine-Westphalia or the city of Bonn as of the reporting date. Furthermore, 4,869 people who were listed in the population register as having a secondary residence as of the reporting date are not included in the statistically relevant population figure.