Regional Statistics
26,228
41
people/km²
87,397
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Population in Ostrołęcki County 2026
Ostrołęcki county ranks 138 of 380 Polish counties. Population shrank by 1,257 residents -1.42% between 2019-2024, now at 87,397.
Among 339 declining counties, ranks in top 20% for steepest loss. Within Masovian voivodeship, ranks 16 of 42 counties (9 growing, 33 declining).
Based on 31 years of official GUS statistics for Ostrołęcki county and its 11 municipalities within Masovian voivodeship.
Total Population Chart
Lowest at 82,815 in 1999
Highest at 88,944 in 2017
1995
29 years (+5 year forecast)
2024
Powiat Ranking
138/380 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
Ostrołęcki
11 municipalities