Regional Statistics
7,236
21
people/km²
18,434
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Population in Sejneński County 2026
Sejneński county ranks 380 of 380 Polish counties. Population shrank by 1,480 residents -7.43% between 2019-2024, now at 18,434.
Among 339 declining counties, in the bottom 20% for rate of decline. Within Podlaskie voivodeship, ranks 17 of 17 counties.
Based on 31 years of official GUS statistics for Sejneński county and its 5 municipalities within Podlaskie voivodeship.
Total Population Chart
Lowest at 18,434 in 2024
Highest at 22,218 in 1995
1995
29 years (+5 year forecast)
2024
Powiat Ranking
380/380 County in Poland
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Year over Year
since 2023
2024
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Vital Statistics
births and deaths
Age Structure
children, working age, and elderly
Gender
Age Distribution
from 0 to 75+ years
Sejneński
5 municipalities