Regional Statistics
Territory of Ostrołęcki County 2026
Ostrołęcki county ranks 138 nationally among Poland's 380 counties by area, in the top 10% of largest counties. Covers 2,093 km² (209,355 ha). Within Masovian voivodeship, ranks 16 of 42 counties. Contains 11 municipalities.
Official GUS territorial statistics for Ostrołęcki county and its 11 municipalities within Masovian voivodeship.
Popular Cities in Poland
You may also be interested in
Contact Information for Ostrołęcki
Updated 52 days ago
Top tools
NIP Generator
Generate valid Polish NIP (VAT / tax ID) numbers with correct checksums for software testing.
Mikrorachunek Generator
Generate your individual Polish tax account number (mikrorachunek podatkowy) from a PESEL or NIP.
Which Bank Is This IBAN?
Paste any IBAN to identify the bank, branch, and BIC/SWIFT code.
Top articles
How to Block Your PESEL Number in Poland
Step-by-step guide to blocking your PESEL number via mObywatel, your bank, or in person. Learn what zastrzeżenie PESEL protects and how to reverse it.
7 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 readHow to Get a PESEL for Your Child Born Abroad or Newborn in Poland
How to get a PESEL for your child born outside Poland or as a newborn. Required documents, which office to visit, and what to expect.
7 min readLet's build Poland.gg together
Join our Discord community. Get early access, shape the roadmap, and connect with data people across Poland.
Dashboard and business tools go public in 2027 — early supporters access them first and keep their discount on everything.
Get up to 90% off — forever
The longer you stay, the less you pay. 9% off per month, stacking up to 90%. The 100 longest supporters get free access for life.
© 2026 Poland.gg