In 1951 Italy had 46,302,644 inhabitants. It was a country freshly out of the war, still largely agricultural, where millions of people were about to leave the countryside for the factories of the North. Seventy-five years later, Italy's population stands at 58,942,828 residents: almost 13 million more, but on a trajectory that turned negative in 2019.
Censuses are the most reliable snapshot of a country. Comparing them decade by decade means reading Italy's history between the lines: the economic boom, the great internal migrations, the flight from the big cities, the growth of the suburban belts and, finally, the demographic winter we are now living through. In this article we retrace 75 years of data, from the 1951 census to the latest 2026 estimates, focusing on Italy's four largest cities and on the municipalities that grew and collapsed the most.
The long curve: from 46 to 59 million
The national time series tells of three distinct phases. The first is the great post-war growth: between 1951 and 1981 Italy went from 46.3 to 55.4 million inhabitants, more than 9 million more in thirty years. It was the era of the economic boom and large families.
The second phase is the plateau: between 1981 and 2001 the population barely moved, from 55.4 to 55.8 million. Birth rates collapsed, but mortality was still contained and the books almost balanced. The third phase is the immigration era: between 2001 and 2011 the population jumped from 55.8 to 58.2 million, driven almost entirely by arrivals from abroad, reaching the all-time high of 59,636,271 residents in 2019.
Since then the curve has bent downwards: in 2026 we stand at 58,942,828 inhabitants, almost 700 thousand fewer than at the peak. It is the first prolonged contraction in the history of the Republic.
Italy's population at the censuses, 1951-2026
Historical series of Italy's resident population: decennial censuses up to 2011, then annual data. Source: ISTAT.
Rome: the capital that never stops attracting
Rome is the only large Italian city to have essentially held its population over the past forty years. In 1951 it had 1,632,402 inhabitants; twenty years later, in 1971, it was already at 2,750,370, nearly 1.1 million more — the result of internal migration from the South and Central Italy towards the ministries, building sites and services of the capital.
The peak of the first cycle came in 1981 with 2,805,109 residents. Two decades of slow erosion followed, down to 2,546,804 in 2001, as the city lost inhabitants to the municipalities of its hinterland. But unlike Milan, Naples and Turin, Rome bounced back: in 2019 it reached 2,820,219 inhabitants, its all-time high. Today it stands at 2,745,062, slightly down but still above its 1971 level.
Rome: population 1951-2026
Historical series of Rome's population at the censuses. The absolute peak came in 2019 with over 2.8 million residents.
Milan: decline and rebirth
Milan's trajectory is the most spectacular among the big cities. In 1951 the Lombard capital had 1,274,187 inhabitants; the industrial boom took it to 1,732,068 in 1971, its all-time high. Then began a forty-year descent: deindustrialisation, soaring house prices, families moving to the towns of the commuter belt. By 2011 Milan had fallen to 1,242,123 residents, half a million below the peak.
The rebirth came in the 2010s: Expo 2015, new metro lines, and the city's pull on students and international workers brought it back up to 1,406,242 inhabitants in 2020. The pandemic and the rent crisis then trimmed the figure, which stands at 1,362,863 in 2026. Milan nonetheless remains the only Italian metropolis to have durably reversed course after the decline of the late twentieth century.
Milan: population 1951-2026
From the 1971 peak of 1.73 million to the 2011 low, and the recovery of the 2010s.
Naples and Turin: the long decline
Naples followed a different arc. In 1951 it had 1,010,550 inhabitants, rising to 1,226,594 in 1971. Since then the decline has never truly stopped: 1,067,365 in 1991, 962,003 in 2011, 905,050 in 2026. In 55 years the city has lost more than 320 thousand residents, dropping below the psychological threshold of one million back in the 2000s. Much of that population did not go far: it moved to the municipalities of the metropolitan area, from Giugliano in Campania to Casoria, which exploded over the same decades.
Turin is the most extreme case of an industrial city. In 1951 it had 719,300 inhabitants; twenty years later, driven by Fiat and southern immigration, it stood at 1,167,968 — up 62 percent in two decades, the fastest growth among the big cities. But the car industry crisis presented the bill: by 2001 the population was back down to 865,263 and today it is 855,654, roughly 312 thousand below the 1971 peak.
Naples: population 1951-2026
The 1971 peak of 1.23 million inhabitants, then an uninterrupted decline down to today's 905 thousand.
Turin: population 1951-2026
The Fiat city: +62% between 1951 and 1971, then deindustrialisation and the loss of over 300 thousand inhabitants.
The towns that exploded: the revenge of the hinterland
As the big cities emptied out, somebody was catching the overflow. The 1951-2026 historical growth ranking is dominated by commuter-belt municipalities, above all around Rome. The absolute record belongs to Fonte Nuova, on the capital's doorstep: from 583 inhabitants in 1951 to 32,787 today, a 5,524 percent increase. It is followed by Ardea, up from 2,361 to 51,374 residents (+2,076 percent), and Pomezia, which grew by 1,683 percent.
Nor is it only a Roman phenomenon: Policoro, in the province of Matera, went from 862 to 17,727 inhabitants thanks to the agrarian reform and the development of the Metaponto plain. These are the numbers of Italian urban sprawl: the population did not vanish from the metropolitan areas, it redistributed itself to where housing was cheaper.
The 15 fastest-growing municipalities since 1951
Percentage change in population between the 1951 census and 2026. Rome's hinterland municipalities dominate.
The towns that emptied out
At the other end of the ranking lies the inner Italy that faded away. Carrega Ligure, in the province of Alessandria, had 1,351 inhabitants in 1951; today it has 76, a 94.4 percent drop. Villa Santa Lucia degli Abruzzi, in the province of L'Aquila, went from 1,251 to 76 residents. Drenchia, on the Slovenian border in the province of Udine, from 1,392 to 88. Ingria, in the Turin valleys, lost 93.6 percent of its population.
These are the numbers of Apennine and Alpine depopulation: mountain villages the economic boom emptied within a generation, which the demographic winter is now finishing off. For many of these municipalities, recent censuses record more houses than inhabitants.
The 15 municipalities that lost the most population since 1951
Percentage change 1951-2026: small mountain municipalities in Piedmont, Abruzzo and Friuli top the list, having lost over 90% of their residents.
The demographic winter: downhill since 2019
2019 will go down in demographic history books as the peak year: 59,636,271 residents. Since then Italy has lost almost 700 thousand inhabitants, the equivalent of a city the size of Palermo. The causes are well known: record-low birth rates, an ever older population, and migration flows that no longer offset the negative natural balance.
The decline is not uniform. The large urban areas of the Centre-North are holding up, while the South and the inner areas are losing ground at twice the pace. The municipal population map shows a country with increasingly polarised density: the Po Valley, the coasts and the metropolitan areas on one side, an emptying Apennine ridge on the other.
The municipal population map
Distribution of the resident population across Italy's 7,896 municipalities: the weight of the Po Valley, the coasts and the metropolitan areas.
Towards 2050: what the projections say
If the current trajectory continues, the next quarter century will amplify the trends already visible in the censuses. The demographic projections to 2050, which we analysed in detail in a dedicated article, point to a smaller and far more concentrated Italy: the metropolitan areas of Milan, Rome and Bologna may contain their losses, while for thousands of small municipalities of inner Italy the decline seen between 1951 and today risks continuing down to the critical threshold of service sustainability.
The three-dimensional map of municipal projections to 2050 makes this divide visible: each column represents a municipality's expected population change over the next 25 years.
Municipal population projections to 2050
Expected population change for each Italian municipality from today to 2050, based on recent demographic trends.
What 75 years of data tell us
Three lessons emerge from this long historical series. First: Italy's great demographic transformations were driven by the economy, not by birth rates. The boom of Turin and Milan, the emptying of the Apennines, the explosion of Rome's hinterland are stories of jobs and housing before they are stories of cradles.
Second: population does not disappear, it moves. For every Naples losing 320 thousand inhabitants there are dozens of belt municipalities absorbing them. Reading only the municipal figure, without looking at the wider area, leads to wrong conclusions.
Third, and most important: the cycle that began in 1951 has closed. For the first time in 75 years Italy is no longer growing, and no internal migration can offset a natural balance that worsens year after year. The censuses of the coming decades will tell a new story: that of a country which must learn to manage decline. On DatiItalia you can explore the complete historical series of each of Italy's 7,896 municipalities, from 1951 to today.