Regional Statistics
1,399
17
people/km²
3,778
Go back to see all fact bundles
Population in Sejny Municipality 2026
Sejny municipality ranks 2115 of 2,478 Polish municipalities. Population shrank by 229 residents -5.71% between 2019-2024, now at 3,778.
Among 1984 declining municipalities, in bottom 50% for rate of decline. Within Sejneński county, ranks 3 of 5 municipalities.
Based on 31 years of official GUS statistics for Sejneński county municipalities within Podlaskie voivodeship.
Total Population Chart
Lowest at 3,778 in 2024
Highest at 4,383 in 1995
1995
29 years (+5 year forecast)
2024
Gmina Ranking
2115/2478 Municipality in Poland
Page 1 of 248
Go to Sejny
Year over Year
since 2023
2024
Page 1 of 248
Go to Sejny
Vital Statistics
births and deaths
Age Structure
children, working age, and elderly
Gender
Age Distribution
from 0 to 75+ years
Sejny