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União das freguesias do Cacém e São Marcos

Parish of the municipality of Sintra (Sintra), district of Lisboa.

União das freguesias do Cacém e São Marcos had 39.683 residents in the 2021 Census, 13,0% of whom were aged 65 or over, and 17,2% of the population aged 15 or over had completed higher education. It borders 4 parishes and its centroid is 8,2 km in a straight line from the centroid of the municipality of Sintra.

Population (inh.)
  • 3.676 – 5.205
  • 7.746 – 12.788
  • 13.347 – 26.310
  • 29.896 – 41.323
  • 47.804 – 68.649
Density (inh./km²)
  • 199,4 – 232,1
  • 232,7 – 426,5
  • 470,4 – 3.001,2
  • 4.290,6 – 6.910,2
  • 7.191,2 – 15.470,6
Area (km²)
  • 2,2 – 3,6
  • 4,4 – 8,6
  • 15,7 – 16,5
  • 22,8 – 33,4
  • 39,8 – 63,6
Quantile classes · current parish
Parish highlighted. Click a neighbouring parish to open its page. Geometry: CAOP2025, Direção-Geral do Território (simplified).

The 15 parishes of Sintra

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

#ParishPopulationArea (km²)Inhab./km²
1Algueirão-Mem Martins68.64916,004.290,6
2Almargem do Bispo9.26139,80232,7
3Belas26.31022,841.151,9
4Casal de Cambra13.3472,176.150,7
5Colares7.74633,37232,1
6Montelavar3.6768,62426,5
7Pêro Pinheiro4.32515,65276,4
8Queluz26.1043,637.191,2
9Rio de Mouro49.48916,493.001,2
10São João das Lampas12.78857,50222,4
11Terrugem5.20526,10199,4
12União das freguesias de Agualva e Mira-Sintra41.3235,986.910,2
13União das freguesias de Massamá e Monte Abraão47.8043,0915.470,6
14União das freguesias de Sintra (Santa Maria e São Miguel, São Martinho e São Pedro de Penaferrim)29.89663,55470,4
15União das freguesias do Cacém e São Marcos39.6834,448.937,6
Code (DTMNFR)
111124
Resident population (2021)
39.683
Area
4,44 km²
Density
8.937,6 inh./km²
Share of the municipality (population)
10,3%
Rank in the municipality (population)
5th of 15

Simplified designation (CAOP2025): “Cacém e São Marcos”.

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
18.558 (46,8%)
Women
21.125 (53,2%)
Portuguese nationality
34.857 (87,8%)
Foreign nationality
4.826 (12,2%)
Ageing index
82,9 elderly per 100 young people
Private households
15.894
Average household size *
2,49 people
Dwellings
18.133
Classic family dwellings
18.132
Buildings
1.907
Buildings with 7 or more floors
413
With higher education (15+)
17,2% (5.750)
Unemployment rate *
9,30% (H 8,17% · M 10,35%)
Active / employed population
21.609 / 19.599

Population by age group

Population by age group0-14 years: 6.238 (15,7%); 15-24 years: 5.257 (13,2%); 25-64 years: 23.018 (58,0%); 65+ years: 5.170 (13,0%)0-146.238 · 15,7%15-245.257 · 13,2%25-6423.018 · 58,0%65+5.170 · 13,0%
Residents by age group and share of the total (39.683).
Age groupTotalMenWomen
0-14 years6.2383.1673.071
15-24 years5.2572.5642.693
25-64 years23.01810.67412.344
65+ years5.1702.1533.017

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

Rio de Mouro · União das freguesias de Agualva e Mira-Sintra · União das freguesias de Massamá e Monte Abraão · Barcarena (Oeiras)

Straight-line distance to the centroid of the municipality of Sintra
8,2 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
31.998
Voters
14.473
Turnout
45,23% (2021: 35,69%)
Seats
19
ListVotes%Seats
PS.L
AS PESSOAS, SEMPRE - COLIGAÇÃO PS/L		4.33429,95%6
PPD/PSD.IL.PAN
SEMPRE COM OS SINTRENSES		4.15128,68%6
CH
CHEGA		3.95227,31%6
PCP-PEV
CDU - Coligação Democrática Unitária		8125,61%1
CDS-PP/PPM/ADN
Por Sintra, a Nossa Casa		3762,60%0
B.E.
Bloco de Esquerda		3202,21%0
ND
NOVA DIREITA		950,66%0
Blank votes2571,78%
Null votes1761,22%

Most-voted list, which elects the parish-council president: PS.L.

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 Nova do Zambujal, N.º 9
Cacém (SINTRA)
2735-302 CACÉM
Telephone
219129380
Email
secretariageral@uf-cacemsmarcos.pt
Website
www.uf-cacemsmarcos.pt

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

More information

Coordinates
38,76450, -9,30280
Wikipedia
Cacém e São Marcos
Wikidata
Q25440060

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