Regional Statistics
Population in Konstancin-Jeziorna Municipality 2026
Konstancin-Jeziorna municipality ranks 245 of 2,478 Polish municipalities. Population grew by 286 residents +1.16% between 2019-2024, now at 25,012.
Among 494 growing municipalities, in top 10% for growth rate. Within Piaseczyński county, ranks 4 of 6 municipalities.
Based on 31 years of official GUS statistics for Piaseczyński county municipalities within Masovian voivodeship.
Popular Cities in Poland
You may also be interested in
Contact Information for Konstancin-Jeziorna
Updated 77 days ago
Top tools
IBAN Checker: Verify a Polish Bank Account Number
Free IBAN checker and validator for Polish bank accounts. Verifies checksum, identifies the bank by sort code, and shows detailed error reports.
PESEL Number Checker
Enter a PESEL number to extract the birth date, gender, and verify the check digit. Works as both a PESEL checker and validator.
PESEL Generator
Generate valid random PESEL numbers with correct checksums. Pick birth date and gender, get a properly encoded Polish ID number instantly.
Top articles
How to Pay Tax on Rental Income in Poland
Step-by-step guide to paying tax on rental income in Poland: ryczałt rates, registration, monthly payments via mikrorachunek, and PIT-28 filing.
10 min readWhat Is a Mikrorachunek? Poland's Individual Tax Payment Account Explained
A mikrorachunek is your personal tax payment account in Poland. Learn how the 26-digit number works, which taxes it covers, and how to verify one.
8 min readHow to Pay Tax After Buying a Car in Poland
Step-by-step guide to paying PCC tax after buying a used car in Poland. Covers the 2% rate, 14-day deadline, PCC-3 form, and online payment.
9 min readMaking sense of Poland
I dig through Polish legal databases and government statistics so you don't have to. Property deep-dives, tax guides, free tools, and the kind of data stories that never make it into English.
© 2026 Poland.gg