TodoPortugal.pt

and if more World there had been, there would they have gone

São Sebastião

★ Save to favourites (account required)

Parish of the municipality of Rio Maior (Rio Maior), district of Santarém.

São Sebastião had 462 residents in the 2021 Census, 31,4% of whom were aged 65 or over, and 7,1% of the population aged 15 or over had completed higher education. It borders 5 parishes and its centroid is 4,1 km in a straight line from the centroid of the municipality of Rio Maior.

Population (inh.)
  • 462 – 634
  • 792 – 797
  • 817 – 957
  • 1.124 – 1.170
  • 1.735 – 12.516
Density (inh./km²)
  • 22,8 – 30,0
  • 39,1 – 50,7
  • 53,7 – 54,2
  • 56,0 – 58,0
  • 67,3 – 137,5
Area (km²)
  • 14,2 – 14,8
  • 15,4 – 16,1
  • 16,7 – 20,2
  • 24,5 – 27,9
  • 32,0 – 91,0
Quantile classes · current parish
Parish highlighted. Click a neighbouring parish to open its page. Geometry: CAOP2025, Direção-Geral do Território (simplified).

The 10 parishes of Rio Maior

Hover a row to highlight it on the map. Click a header to sort.

#ParishPopulationArea (km²)Inhab./km²
1Alcobertas1.73532,0354,2
2Arrouquelas63427,8522,8
3Asseiceira1.12416,7167,3
4Fráguas81716,1250,7
5Rio Maior12.51691,00137,5
6São Sebastião46215,4030,0
7União das freguesias de Azambujeira e Malaqueijo79714,8453,7
8União das freguesias de Marmeleira e Assentiz79214,1556,0
9União das freguesias de Outeiro da Cortiçada e Arruda dos Pisões95724,4839,1
10União das freguesias de São João da Ribeira e Ribeira de São João1.17020,1758,0
Code (DTMNFR)
141411
Resident population (2021)
462
Area
15,40 km²
Density
30,0 inh./km²
Share of the municipality (population)
2,2%
Rank in the municipality (population)
10th of 10

INE, Censos 2021 (população residente por freguesia, geografia 2025, ind. 0014584); DGT, CAOP2025 (área). Population refers to the 2021 census moment, compiled by INE for the parish boundaries in force in 2025.

2021 Census in detail

Men
217 (47,0%)
Women
245 (53,0%)
Portuguese nationality
449 (97,2%)
Foreign nationality
13 (2,8%)
Ageing index
362,5 elderly per 100 young people
Private households
201
Average household size *
2,30 people
Dwellings
283
Classic family dwellings
283
Buildings
279
Buildings with 7 or more floors
0
With higher education (15+)
7,1% (30)
Unemployment rate *
5,45% (H 7,14% · M 3,33%)
Active / employed population
202 / 191

Population by age group

Population by age group0-14 years: 40 (8,7%); 15-24 years: 49 (10,6%); 25-64 years: 228 (49,4%); 65+ years: 145 (31,4%)0-1440 · 8,7%15-2449 · 10,6%25-64228 · 49,4%65+145 · 31,4%
Residents by age group and share of the total (462).
Age groupTotalMenWomen
0-14 years401525
15-24 years492722
25-64 years228116112
65+ years1455986

Source: INE, Censos 2021 — indicators 0014630, 0014631, 0014627, 0014623, 0014621, 0014635, 0014636, 0012481, 0012328, 0014632, obtained from the INE indicators API on 24/09/2026 (licence CC BY 4.0). Parish geography of 2025 (CAOP2025). Nationality (Portuguese, foreign, stateless) is INE indicator 0014632. * Indicator published by INE only for 2013 parish geography (NUTS 2024); used because the parish has the same territory in both geographies (identical population by sex and age group). Ageing index = population aged 65+ ÷ population aged 0–14 × 100; share with higher education = residents with completed higher education ÷ residents aged 15 or over (our calculations from INE figures).

Neighbouring parishes

Straight-line distance to the centroid of the municipality of Rio Maior
4,1 km

Neighbourhood calculated from official boundaries: DGT, Carta Administrativa Oficial de Portugal (CAOP) 2025 (licence CC BY 4.0); two parishes are neighbours when they share a boundary segment. The distance is the straight-line (great-circle) distance between the geometric centroid of the parish and that of the municipality (in territories with islets, of the main part), not a road distance.

2025 local elections — Parish assembly

Registered voters
435
Voters
288
Turnout
66,21% (2021: 64,83%)
Seats
7
ListVotes%Seats
PPD/PSD.CDS-PP
Coligação Juntos Pelo Futuro
19266,67%5
PS
Partido Socialista
8128,13%2
Blank votes93,13%
Null votes62,08%

Most-voted list, which elects the parish-council president: PPD/PSD.CDS-PP.

Source: SGMAI — official results of the local elections of 12 October 2025 (Secretary-General of the Ministry of Internal Administration), consulted on 25/09/2026. Percentages calculated by SGMAI over total voters.

Parish-council contacts

Address
Rua 16 de Maio, N.º 28
São Sebastião (RIO MAIOR)
2040-494 SÃO SEBASTIÃO
Telephone
243907534
Fax
243907534
Email
freguesiasaosebastiao@hotmail.com

Source: DGAL - Portal Autárquico (Direção-Geral das Autarquias Locais), consulted on 25/09/2026.

More information

Coordinates
39,36667, -8,88806
Official website
www.cm-riomaior.pt/riomaior/Autarquia/JuntasFreguesia/Junta+de+Freguesia+de+S.+Sebastião.htm
Wikipedia
São Sebastião (Rio Maior)
Wikidata
Q2119437

Source: Wikidata (data under CC0 1.0), consulted on 24/09/2026. The patron saint and coordinates are those recorded on Wikidata.

Sources: INE, 2021 Census (resident population) · DGT, CAOP2025 (area and parishes) · more details · Data updated on 24/09/2026