In 2022, in terms of population, the biggest cities or municipalities in Belgium were Antwerp, Ghent, Charleroi, Liège, and Brussels. The Flemish cities of Antwerp and Ghent were the most populated in Belgium in 2022. From a regional perspective, out of the 6.8 million people living in Flanders, around 800,000 people lived in one of these two cities. However, the region of Wallonia also had large cities such as Charleroi and Liège. For instance, both cities registered around 200,000 inhabitants each. To put all these numbers into perspective, Belgium’s population amounted to 11.6 million in 2022.

Belgium’s capital city: Brussels

Surprisingly, the Belgian capital, Brussels, was not on top of the list. The reason for this is in the way the city’s population is measured. Brussels is made of 19 municipalities. In this ranking, for instance, only three of them are listed: Brussels City, Schaerbeek, and Anderlecht. These 19 municipalities form the heart of the agglomeration of Brussels which counts 36 municipalities in total and is also known as “le Grand Bruxelles”. In 2019, over a million people were living in this Brussels-Capital Region. The agglomeration of Brussels is the most populated in the country, it is bigger than the agglomeration of Antwerp. Yet in terms of municipalities, Antwerp was the most populated in Belgium in 2020.

Belgium’s five big agglomerations

Belgium faced a population growth of 0.58 percent in 2020. The country counts five big agglomerations: Antwerp, Brussels, Charleroi, Ghent, and Liège. Although the notion of agglomeration is very fluid and disputed, each of these five agglomerations represents a significant part of the population. For some, agglomerations are defined by the continuity of constructions. For others, they are defined by the sense of an urban entity shared by a living community. Nonetheless, the definition of an agglomeration in Belgium corresponds to the European rules. These rules fix the technical specifications regarding the population and housing census. An agglomeration is, therefore, a group of municipalities which includes a continuously built-up zone with no cut of more than 200 meters between two constructions.

Belgium's largest cities in terms of population in 2025 were situated in Flanders. Approximately ******* people lived in Antwerpen, making it the biggest city in Belgium. This city was followed by Gent with ******* inhabitants in 2025. However, the third and fourth city with the most inhabitants were in the Belgian region of Wallonia. Indeed, Charleroi counted ******* inhabitants, and Bruxelles, ******* inhabitants.

Want to live somewhere quiet? Then the Brussels-Capital Region maybe would not be the place for you. In a country where the population density was highly depended on the region, the Brussels-Capital Region far exceeded the others in terms of residents per square kilometer. Whereas in Brussels over 7,500 people lived per a square kilometer, in the Walloon Region this was only 276. In total, roughly 1.22 million inhabitants lived in the Brussels-Capital Region in 2022.

 Flemish Region has the highest number of inhabitants  

Although the Brussels-Capital Region had the highest population density, it was by no means Belgium’s region with the largest number of inhabitants. On the contrary: both the Flemish and the Walloon Regions had more inhabitants than the Brussels Region. In total, just over ten percent of Belgium’s population lived in Brussels, the rest was divided among Flanders (58 percent) and Wallonia (32 percent).

 Comparison to the other Benelux countries   

Belgium’s population density amounted to 375 inhabitants per square kilometer in 2021. This was significantly lower than the population density in neighboring country the Netherlands, where on average 519 inhabitants lived on a square kilometer. It was however higher than Luxembourg’s population density, which amounted to about 245 inhabitants per square kilometer. This was the lowest population density of all three Benelux countries.

In the year 1500, the share of Western Europe's population living in urban areas was just six percent, but this rose to 31 percent by the end of the 19th century. Despite this drastic change, development was quite slow between 1500 and 1800, and it was not until the industrial revolution when there was a spike in urbanization. As Britain was the first region to undergo the industrial revolution, from around the 1760s until the 1840s, these areas were the most urbanized in Europe by 1890. The Low Countries Prior to the 19th century, Belgium and the Netherlands had been the most urbanized regions due to the legacy of their proto-industrial areas in the medieval period, and then the growth of their port cities during the Netherlands' empirical expansion (Belgium was a part of the Netherlands until the 1830s). Belgium was also quick to industrialize in the 1800s, and saw faster development than its larger, more economically powerful neighbors, France and Germany. Least-urban areas Ireland was the only Western European region with virtually no urbanization in the 16th and 17th century, but the industrial growth of Belfast and Dublin (then major port cities of the British Empire) saw this change by the late-1800s. The region of Scandinavia was the least-urbanized area in Western Europe by 1890, but it saw rapid economic growth in Europe during the first half of the following century.

It is estimated that Europe had an urbanization rate of approximately 8.5 percent in the year 1800. The Netherlands and Belgium were some of the most heavily urbanized regions, due the growth of port cities such as Rotterdam and Antwerp during Netherlands' empirical expansion, and the legacy of urbanization in the region, which stems from its wool and craft industries in medieval times. Additionally, the decline of their agricultural sectors and smaller territories contributed to a lower rural population. Scotland and England had also become more urban throughout the British Empire's growth, although the agricultural revolution of the previous two centuries, along with the first industrial revolution, then led to more rapid urbanization during the 19th century. In contrast, there was a large imbalance between the east and west of the continent; the two largest empires, Austria and Russia, had the lowest levels of urbanization in Europe in 1800, due to their vast territories, lower maritime presence, and lack of industrial development.

In 2023, 17.81 million people were living in the Netherlands. The most populated age group was 50 to 55 years old, with 1.28 million people in that age range. Of these, 635,000 were male, and 640,000 were female. The distribution between male and female population was somewhat equal for all age groups, until the highest age groups. For 100 years and older, there were around 2,200 females and only about 400 males, while the distribution for people between the ages of 95 to 100 was 5,700 males and 18,100 females.

How is the population distributed by province?

The Netherlands counts 12 provinces, and naturally, the Dutch population is not distributed among them equally. In 2022, the most populated province was South Holland which includes cities such as Rotterdam and The Hague with 3.67 million residents. North-Holland, which includes the Dutch capital Amsterdam, had 2.85 million residents. The least populated province was that of Zeeland, with a mere 383,000 residents.

How does the Dutch population compare to the rest of Europe?

In 2021, the Netherlands had the eleventh highest population in Europe, with 17.17 million residents. This puts the Netherlands above Belgium with 11.63 million and below Romania with 19.12 million. Russia is the most populated European country with 145.91 million residents, meaning it has about 8.5 times the population of the Netherlands. The least populated country in Europe other than Vatican city is Gibraltar, with 34,000 inhabitants, meaning it has 0.2 percent of the population of the Netherlands