Largest population
Indonesia has 287,886,782 people in the 2026 medium projection.
South-Eastern Asia population pyramid 2026
704,755,916 people in 2026 (projected), a UN subregion of Asia with 11 countries and areas.
- 2026 population
- 704.8Mmedium projection
- Median age
- 31.2 years
- Under age 15
- 23.0%
- Age 65+
- 8.7%
South-Eastern Asia population pyramid
2026 · Share of total by five-year age group and sex
Medium projection
South-Eastern Asia population pyramid for 2026: males on the left and females on the right
100+
95–99
90–94
85–89
80–84
75–79
70–74
65–69
60–64
55–59
50–54
45–49
40–44
35–39
30–34
25–29
20–24
15–19
10–14
5–9
0–4
Hover over or tap a bar to see exact values.
Estimate or projection?
The UN series provides historical estimates through 2023. Figures from 2024 onward—including 2026—are medium-scenario projections, not counts or predictions guaranteed to occur.
South-Eastern Asia age structure
In 2026, children under 15 make up 23.0% of South-Eastern Asia’s projected population, compared with 8.7% aged 65 or older. The conventional working-age group, 15–64, accounts for 68.2%.
By 2050, the medium scenario places the population at 774,570,267—a 10% increase from 2026. The 65+ share is projected to reach 16.3%.
Births, deaths, and migration in South-Eastern Asia
The subregion is projected to record 10,068,657 births and 5,304,340 deaths in 2026, a natural increase of 4,764,317, with net migration of −121,030. Deaths are projected to exceed births from 2055. Between 2000 and 2023, cumulative net migration was −2,675,164.
Annual values; dashed lines after 2023 are the UN medium projection.
Mid-year population for every year; the medium scenario reaches 774.6M in 2050.
Demographic contrasts within South-Eastern Asia
A regional pyramid is an aggregate, not a description of every country. The profiles within South-Eastern Asia range from a median age of 22.1 years in Timor-Leste to 41.0 years in Thailand. Those age structures imply different balances of schools, working-age cohorts, and older-age services.
Youngest median age
Timor-Leste has a median age of 22.1 years and 32.6% under 15.
Fastest 2026 growth
Timor-Leste has projected annual growth of +1.3%.
Countries and areas in South-Eastern Asia
| Rank | Country or area | 2026 population | Median age | Under 15 | 65+ |
|---|---|---|---|---|---|
| 1 | Indonesia | 287,886,782 | 30.7 | 23.9% | 7.8% |
| 2 | Philippines | 117,724,472 | 26.6 | 26.4% | 6.0% |
| 3 | Vietnam | 102,177,431 | 33.9 | 22.4% | 9.9% |
| 4 | Thailand | 71,559,614 | 41.0 | 14.1% | 16.7% |
| 5 | Myanmar | 55,184,819 | 30.4 | 23.9% | 7.7% |
| 6 | Malaysia | 36,385,115 | 31.4 | 20.8% | 8.3% |
| 7 | Cambodia | 18,051,219 | 26.4 | 29.2% | 6.6% |
| 8 | Laos | 7,974,018 | 25.3 | 29.5% | 5.0% |
| 9 | Singapore | 5,905,748 | 36.8 | 11.7% | 14.8% |
| 10 | Timor-Leste | 1,436,923 | 22.1 | 32.6% | 5.2% |
| 11 | Brunei | 469,775 | 33.2 | 20.4% | 7.6% |
Source and interpretation
Regional age groups and totals come directly from the UN WPP 2024 medium series. Country groupings follow the UN M49 regions and subregions used in the source; territories and statistical areas may appear separately. Projection results depend on future fertility, mortality, and migration assumptions.
Questions about South-Eastern Asia
What is the population of South-Eastern Asia in 2026?
The UN WPP 2024 medium scenario projects South-Eastern Asia's 2026 population at 704,755,916.
Which is the most populous country or area in South-Eastern Asia?
Indonesia is the largest profile in this regional directory, with a projected 2026 population of 287,886,782.
Is South-Eastern Asia's population projected to grow by 2050?
The medium scenario shows a 9.9% increase between 2026 and 2050.