Three counts for the same municipality

In 2021, the Census found 29,538 people living in Odemira. The following year, the municipality's personalized healthcare unit had 32,762 registered users — 3,224 more than the residents the census had counted. In 2025, the National Statistics Institute's resident population estimate puts Odemira at 44,043 inhabitants.

These are three numbers for the same territory, produced by the same state, with a four-year interval between the first and the last. None of them are wrong: they count different things. The Census counts who was censused on an April night; health records count who registered at a health center; the estimates cross-reference the census with administrative records, among them residence permits. When the three series diverge this much, the divergence ceases to be a methodological detail and becomes the news.

What is at stake is practical. Funding is distributed, schools are sized, doctors per inhabitant are calculated, and housing is planned based on population. A municipality that appears with 29 thousand inhabitants in one document and 44 thousand in another is sized twice in different ways.

The only one that grew

In the results of the 2021 Census, Odemira was the only one of the 47 municipalities in Alentejo that gained population in the previous decade: it went from 26,066 residents in 2011 to 29,538, up 13.3 percent. Over the same period, the region lost close to 7 percent — the largest drop of all Portuguese regions. At the opposite extreme was Barrancos, down 21.8 percent, the steepest percentage drop among the country's 308 municipalities.

What happened after 2021 is more pronounced than what happened before. Between 2021 and 2025, according to Pordata based on INE data, Odemira gained 7,886 people — a growth of 21 percent, when the national average over the same period was 7.8 percent. The municipality grew almost three times faster than the country.

The detail that explains almost everything lies in the breakdown of that growth. The natural balance — births minus deaths — was negative by 415 people. The migratory balance was positive by 8,301. In Odemira, more people continue to die than are born, exactly like in the rest of Alentejo. The difference is that more people arrive than leave, and they arrive in sufficient numbers to invert the sign.

What drives it: twelve thousand hectares designed in the sixties

The engine is not new. The Mira Hydroagricultural Scheme was built between 1963 and 1973 and benefits, according to the Directorate-General for Agriculture and Rural Development, an area of 12,000 hectares, of which 10,670 are in the municipality of Odemira and about 1,330 in that of Aljezur. The water comes from the Santa Clara dam on the Mira river, completed in 1968. Management is handled by the Mira Beneficiaries Association.

The perimeter was designed for an agriculture that is not what is practiced there today. Between 2013 and 2018, the actually irrigated area ranged between 4,911 and 5,808 hectares — less than half the benefited area. Intensive production of red berries in greenhouses, tunnels, and shelters, which DGADR describes as predominant in the Odemira part of the scheme, settled into this fraction.

The value lies on the export side. According to the Ministry of Agriculture, Portuguese exports of small fruits reached 398 million euros in 2025, 17 percent more than in 2024 and more than triple what it was ten years ago. On a national scale, blueberries occupy 2,670 hectares and raspberries 1,564. It is a crop that requires labor almost all year round and cannot be mechanized: every kilo is harvested by hand.

Who arrived

At the end of 2025, according to INE data, Odemira had 22,930 foreign residents out of a total of 44,043 — 52.06 percent. In Portugal, the same source points to 1,597,539 foreigners out of 11,424,031 residents, about 14 percent. Odemira therefore has almost four times the national proportion. Among the country's municipalities, only Albufeira presents a value of the same magnitude, 55.1 percent in 2024 according to data from the Migration Observatory; in Alentejo, the second highest is Ferreira do Alentejo, with 30.2 percent.

The concentration becomes clearer on the regional scale. Alentejo had 71,309 foreigners in 2025, 13.9 percent of its population, compared to 35,035 in 2021. Close to a third of them live in Odemira, a municipality that accounts for less than a tenth of the Alentejo population.

As for origins, the most recent data by nationality that could be confirmed are from 2020, when the High Commissioner for Migration indicated that Nepal and India each accounted for about 24 percent of the municipality's foreigners, and Bulgaria 10 percent. Between 2015 and 2020, Odemira's foreign population grew 143 percent. An indirect and more recent snapshot comes from schools: in 2022/23 there were 697 foreign students in the municipality, coming from 32 countries, 27.7 percent more than in the previous academic year, with Nepal (170) and India (166) in the lead. About half of the approximately 700 students in São Teotónio schools are children of foreigners.

The easiest reading, and why it doesn't hold up

The intuitive explanation for Odemira's growth is that the municipality is receiving families and rejuvenating through births. The numbers do not support this: the natural balance remains negative. All growth comes from outside.

There is a second reading, which circulates frequently and also fails verification: that foreigners were already the majority before 2024. In 2023, Polígrafo classified as false the claim that Odemira had more immigrant than resident population, based on the data available at the time from the 2021 Census.

And there is a figure that requires caution. The Migration Observatory, in its report on the foreign population in 2024, attributes 68.7 percent to Odemira — the highest value in the country. The document itself explains the construction: the numerator is AIMA residence permits, the denominator is INE's resident population estimate for the same year. Since INE later revised the municipality's population upward, the 2024 ratio became inflated. INE's 52.06 percent for 2025 and AIMA's 68.7 percent for 2024 are not two measurements of the same fact: they are two calculations with different denominators. Anyone choosing the higher number is choosing the less consistent calculation.

What growth did not solve

Odemira's Municipal Housing Charter, in its preliminary proposal of February 2025, is the most direct document on the subject. It points to 21 percent of the municipality's housing units in a situation of overcrowding, concentrated mostly in São Teotónio and Relíquias, and estimates at 3,200 the temporary agricultural workers in need of dignified housing. It identifies 1,400 households in need of rehousing and projects another 2,140 by 2037.

At the same time, the municipality's Social Diagnosis counts 3,963 vacant housing units in 2021, 536 more than ten years earlier. Empty houses and overcrowded houses in the same territory is not a statistical contradiction: it is what happens when existing housing is where people do not work, or out of reach of those who do.

Regarding temporary solutions, the same Charter is precise: the municipality authorized capacity for about 3,200 people in removable temporary housing facilities in 2023 and 2024, but in August 2024 only 1,998 were fully compliant. The document stresses that these are transitional solutions and that permanent urban integration is required by 2029.

The history is well known. On April 30, 2021, a sanitary cordon was decreed for the parishes of São Teotónio and Longueira/Almograve. In a single GNR check on May 10, 792 workers were inspected and 155 were prevented from entering for failing to present a negative test. That year, up to May 12, the Authority for Working Conditions had made 122 visits to 92 companies in the municipality and issued 144 notices of infraction, covering 4,318 workers.

The same pattern, four countries

Odemira is not a Portuguese anomaly: it is the Portuguese version of a well-documented European pattern.

In Almería, in southern Spain, the 2024/25 campaign counted about 33,000 hectares of greenhouses and exports of 3,716 million euros, according to the Junta of Andalusia. In the province of Ragusa, in Sicily, the so-called fascia trasformata went from about 34 hectares of greenhouses in 1960 to more than 15,000 today, with close to 28,000 agricultural workers, of whom 12,600 are foreigners. In Westland, in the Netherlands, the municipality recognizes about 12,000 migrant workers in horticulture, of whom only 4,500 are housed within its borders, and treats housing as an unresolved task.

The sequence repeats: water or climate that allows off-season production, European demand all year round, a crop that cannot be mechanized, and a rural territory with few inhabitants receiving, in a few years, more workers than houses.

One consequence remains that is measured and rarely stated. Odemira's aging index dropped from 202 elderly people per 100 young people in 2021 to 179 in 2025. Alentejo stands at 222 and the national average at 188.8. The rural municipality that was older than the country has become younger than it. In 2023/24, the São Teotónio school cluster opened ten more classrooms, with an investment of about 200 thousand euros, and reopened schools that had been closed — the exact reverse of what happened in most neighboring municipalities in the same decade.