Lisbon is the capital of Portugal, a city of about 658,000 people (2025 estimate) on the northern shore of the Tagus estuary, where the river meets the Atlantic in the west of the Iberian Peninsula. The municipality covers just 100 square kilometres, yet the metropolitan area around it holds about 3.35 million people, roughly 28% of everyone in Portugal. That mismatch between a compact city and a very large urban region is the key to understanding Lisbon, and most of what makes it distinctive shows up best in comparisons: with its own past, with Porto, with Madrid, and with the rest of the country it has governed since 1255.
100 Square Kilometres Against a 3.35-Million Metropolis
Unlike most large cities, Lisbon's city limits coincide exactly with the boundaries of its municipality, and those boundaries are tight: 100.05 square kilometres. About a tenth of that area, some 10 square kilometres on the western edge, is taken up by Monsanto Forest Park, one of the largest urban parks in Europe. Spread roughly 658,000 residents across the whole municipality and the density comes out at more than 5,600 people per square kilometre.
Almost everything people loosely call "Lisbon" lies outside that line. Greater Lisbon (Grande Lisboa) runs along the north bank of the Tagus through separately administered municipalities such as Oeiras, where many of the multinational companies operating in Portugal have their headquarters. The wider metropolitan area also takes in the Setúbal Peninsula on the south bank. Together they make the third-largest metropolitan area on the Iberian Peninsula, after Madrid and Barcelona, and one of the ten most populous urban areas in the European Union.
The estimates of that metro population vary with the method. Government figures give about 3.35 million; the OECD counted 2,797,612, Eurostat 2,839,908 and the Brookings Institution 2,968,600. Whichever figure is used, the city proper is only a fifth to a quarter of the whole.
Lisbon's Population Swing: 807,937 in 1981, 545,796 in 2021
The city's own history makes a sharper contrast than any rival does. Lisbon had about 35,000 people in 1300 and close to 200,000 by 1700, growth that came with the age of Portuguese maritime expansion. Census figures from the national statistics institute (INE) show steady growth through the twentieth century, from 351,210 in 1901 to 802,230 in 1960, and a peak of 807,937 in 1981.
Then the city emptied. Families left the old centre for cheaper and larger homes in the suburbs, and by 2021 the municipality counted only 545,796 residents, a loss of about a third in forty years. During the same decades the metropolitan area kept growing, so the region was never shrinking; the population was simply moving across the municipal boundary.
The latest figures reverse the trend. Official estimates put the city at 665,141 in 2024 and 658,236 in 2025, a rise of 20.6% on the 2021 census and the highest count since 1991. The increase comes essentially from people arriving from abroad: in 2019 about 17.5% of the city's residents held a foreign nationality, up from 8.9% in 2014. Housing has not kept pace, because a plurality of the houses in the city centre have become tourist accommodation, and in 2022 the city received about six tourists for every resident.
Lisbon Versus Porto: Capital and Rival on Two Rivers
Portugal's second city sits in the north, at the mouth of the Douro, and the two have been compared for centuries. On paper Lisbon wins every contest of size. Its municipality has about 658,000 people against roughly 273,000 in Porto; its metro area has about 3.35 million against Porto's roughly 1.9 million; its municipal territory is 100 square kilometres against Porto's 41.42. The Globalization and World Cities Research Network ranks Lisbon an "alpha minus" global city and Porto "gamma plus", and they are the only two Portuguese cities on its list at all.
Porto answers with seniority of a different kind. Its Roman name, Portus Cale, is generally cited as the origin of the word Portugal, and the country was born in the north: Lisbon was taken from its Moorish rulers only in 1147, by Afonso Henriques, and did not replace Coimbra as the capital until 1255. Porto's historic centre, with the Luiz I Bridge and the Monastery of Serra do Pilar, became a UNESCO World Heritage Site in 1996, and port wine, one of Portugal's best-known exports, takes its name from the city, whose cellars across the river in Vila Nova de Gaia handled its packaging and shipping.
The rivalry is also about weight. Lisbon holds the national government, the Assembly of the Republic, the Supreme Court of Justice and the residence of the president, along with the embassies of 86 countries. Portugal is a highly centralised unitary state, made up of seven mainland regions and two autonomous regions, and that centralisation runs through the capital. For a ranking of the country's other urban centres, from Braga to Coimbra, see our guide to the largest cities in Portugal.
2,875 Hours of Sun and a Bone-Dry July on the Tagus
Lisbon has a Mediterranean climate (Köppen Csa) with an average annual temperature of 17.6 °C, and its sunshine total of about 2,875 hours a year is one of the highest in Europe. The 1991–2020 normals give an average January high of 15.1 °C and an average August high of 28.8 °C, so the seasonal range is narrow compared with inland Iberia.
Rainfall is where the contrast lies. The city receives about 793 millimetres a year, but almost none of it falls in summer. July averages 2.6 millimetres and August 5.4, while November, the wettest month, averages 133.9. November and December together bring about a third of the annual total. The heat record, 44.0 °C, was set on 4 August 2018; the cold record, −1.5 °C, dates from 15 February 1860.
The metropolitan area shows how much the ocean matters. Sintra and Cascais, west of the city and more exposed to the Atlantic, are cooler in summer, and on extreme days the afternoon high can differ by as much as 20 °C between central Lisbon and Cabo da Roca, the westernmost point of continental Europe, at the tip of the Sintra range some 42 kilometres west of the city. Sintra and Setúbal have both recorded frosts well below anything measured in the city centre, which benefits from its urban heat island. For a month-by-month breakdown aimed at travellers, our guide to the best time to visit Lisbon goes further.
Madrid, Reykjavík and the Westernmost Mainland Capital
Set Lisbon beside its Iberian neighbour and the scale gap is striking. Madrid had over 3.4 million people in its city proper in 2025, more than five times Lisbon's population, spread across 605.77 square kilometres, six times Lisbon's area. Its metro area, about 6.8 million, is roughly double Lisbon's. Madrid also sits about 660 metres above sea level on the small Manzanares river in the middle of the peninsula, while Lisbon is a sea-level port on one of Europe's great estuaries.
Age runs the other way. Madrid became the permanent seat of the Spanish court only after 1561, three centuries after Lisbon became Portugal's capital, and Lisbon's own roots are far older still. Archaeologists have found evidence of an Iron Age settlement on the castle hill from the 8th to 6th centuries BC and of Phoenician trade on the site, and under Rome the town, Olisipo, was given the title Felicitas Julia. It is usually described as the second-oldest capital in Europe after Athens.
Geography sets one more record. Lisbon is the westernmost capital of a mainland European country; among the capitals of Europe's sovereign states, only Reykjavík, on the island of Iceland, lies farther west.
Two Bridges Across the Tagus: 1966 and 1998
The estuary that made Lisbon a port also cut it off from the south, and the two road crossings show how the city's reach has changed. The first, a suspension bridge with a main span of 1,013 metres, opened in 1966 as the Salazar Bridge, named after the dictator who ordered it. After the Carnation Revolution of 25 April 1974 it was renamed the 25 de Abril Bridge. It links Lisbon with Almada and carries six lanes of traffic on its upper deck, with a double-track railway added below in 1999.
The second, the Vasco da Gama Bridge, opened on 29 March 1998, in time for Expo 98, the world's fair that marked 500 years since Vasco da Gama reached India by sea. Its central viaduct alone runs 6.35 kilometres, and the whole structure is the longest bridge in the European Union. It was built partly to relieve the older bridge and partly so that traffic between northern and southern Portugal would no longer have to pass through the capital at all. The Tagus itself, which rises in Spain and reaches the sea here, is covered in our complete guide to the Tagus River.
Before and After 1 November 1755
The single sharpest contrast in Lisbon's story is between the city that existed on the morning of 1 November 1755 and the one that stands today. The earthquake that struck at about 09:40 on All Saints' Day, with an estimated magnitude of 7.7 or more and an epicentre in the Atlantic about 290 kilometres to the southwest, was followed by a tsunami that surged up the Tagus and by fires started from candles lit for the holiday. Between 30,000 and 40,000 people are estimated to have died in Lisbon. INE's historical series puts the city at about 180,000 before the disaster and 165,000 the year after, although other estimates of the pre-quake population run from 200,000 to 275,000.
The rebuilding was just as drastic. The king and his minister Sebastião José de Carvalho e Melo, later the Marquis of Pombal, chose the most radical of four plans put forward by the chief engineer Manuel da Maia: clear the medieval lower town rather than restore it, and replace its tangle of streets with the grid of the Baixa Pombalina. The new buildings used a flexible timber frame built into the walls, floors and roofs, designed to shake without falling, and each building was separated from its neighbours by walls meant to stop fire spreading, making the Pombaline buildings among the earliest seismically protected constructions in Europe. The disaster itself became the first earthquake studied scientifically across a wide area, and is often described as the birth of modern seismology.
Across the valley, the Alfama was largely spared and kept its older labyrinth of narrow streets and small squares, so the two districts facing each other below the castle still show the city before and after 1755. For how the hills, valleys and waterfront fit together, see our guide to Lisbon's city geography.
Quick Facts About Lisbon
- Country: Portugal
- Continent: Europe (Southern Europe)
- Country population: approximately 10.4 million
- Capital city status: Lisbon is the capital of Portugal, the seat of national government, and the location of foreign embassies, parliament, and the head of state's official residence.
Frequently Asked Questions
What is the capital of Portugal?
The capital of Portugal is Lisbon. Lisbon is the seat of national government, hosts most foreign embassies and consulates, and is typically where the head of state and parliament are located.
What continent is Lisbon in?
Lisbon, the capital of Portugal, is located in Europe, in the Southern Europe region. As Portugal's capital, Lisbon serves as the country's primary connection to the broader Europen political, economic, and cultural sphere.
Why is Lisbon the capital of Portugal?
Lisbon was chosen as the capital of Portugal for reasons that typically combine geography, history, and politics. Capital city selections often reflect a desire for centrality (being accessible from across the country), historical importance (being a longstanding seat of government or culture), or neutrality (being acceptable to multiple regions or ethnic groups within the country). The specific reasons for Lisbon's designation are detailed in the city's history above.
What is Lisbon known for?
As the capital of Portugal, Lisbon is best known for housing the country's central government institutions — parliament, presidential or royal residences, supreme court, and key ministries. It is also typically a major cultural and economic center within Portugal, hosting national museums, embassies, and signature monuments. The introduction and history sections above provide detailed coverage of the city's specific notable institutions and landmarks.
Related Pages
- Portugal Country Guide — full geography, climate, economy, and culture overview
- Flag of Portugal — meaning, history, and design of Portugal's national flag