# Population in Ostrołęcki

Population in Ostrołęcki was 357,441 in 2025. Source: Eurostat, European Commission.

- Indicator id: `population`
- Place id: `pl-nuts-pl924`
- Unit: persons
- Definition: Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
- Note: For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.
- Source: Eurostat, European Commission, Population on 1 January by NUTS 3 region (demo_r_pjanaggr3) (https://ec.europa.eu/eurostat/databrowser/view/demo_r_pjanaggr3/default/table)
- Retrieved: 2026-10-08
- License: Eurostat reuse policy (commercial and non-commercial reuse, attribution required)
- Citation: Eurostat. Population on 1 January by NUTS 3 region (demo_r_pjanaggr3). https://ec.europa.eu/eurostat/databrowser/view/demo_r_pjanaggr3/default/table. Retrieved 2026-10-08.
- Web page: https://invokely.ai/en/population/ostro-ecki-pl924
- CSV: https://invokely.ai/download/population/ostro-ecki-pl924.csv
- API: https://invokely.ai/api/v1/series?indicator=population&place=pl-nuts-pl924

| Period | persons |
|---|---:|
| 2025 | 357,441 |
| 2024 | 359,737 |
| 2023 | 361,537 (estimated) |
| 2022 | 363,618 (estimated) |
| 2021 | 366,050 (break) |
| 2020 | 379,997 |
| 2019 | 381,313 |
| 2018 | 382,337 |
| 2017 | 382,940 |
| 2016 | 383,632 |
| 2015 | 384,741 |
| 2014 | 385,510 |