The followng parishes were part of the Ostrołęka Powiat at the beginning of the 20th Century: Czerwin, Goworowo, Kadzidło, Kleczkowo, Myszyniec, Ostrołęka, Piski, Rzekuń, and Troszyn.
Józef Michał Bazewicz, Atlas geograficzny ilustrowany Królestwa Polskiego (Litografia B. A. Bukaty, Warsaw, 1907); digital images, Mapywig (http://igrek.amzp.pl/details.php?id=11767094 : accessed 07 May 2023).
The administrative structure of the parishes of Czerwin, Goworowo, Kadzidło, Myszyniec, Ostrołęka, Troszyn can be described as follows:
- 01 Jul 1569-03 Oct 1795: Village, Łomża Ziemia, Masovian Voivodeship, Province of Greater Poland, Polish-Lithuanian Commonwealth
- 04 Oct 1795-13 Oct 1809: Village, Kammerdepartement Płock, Province of New East Prussia, Kingdom of Prussia
- 14 Oct 1809-09 Jun 1815: Village, Ostrołęka Powiat, Płock Department, Duchy of Warsaw
- 09 Jun 1815-15 Jan 1816: Village, Ostrołęka Powiat, Płock Department, Congress Kingdom of Poland
- 16 Jan 1816-06 Mar 1837: Village, Ostrołęka Obwód, Płock Voivodeship, Congress Kingdom of Poland
- 07 Mar 1837-1842: Village, Ostrołęka Obwód, Płock Gubernia, Congress Kingdom of Poland
- 1842-1844: Village, Ostrołęka Powiat, Płock Gubernia, Congress Kingdom of Poland
- 1844-30 Dec 1866: Village, Ostrołęka Powiat, Płock Gubernia, Congress Kingdom of Poland
- 31 Dec 1866-17 Oct 1915: Village, Ostrołęka Powiat, Łomża Gubernia, Congress Kingdom of Poland
- 18 Oct 1915-10 Nov 1918: Village, Ostrołęka Powiat, General Government of Warsaw, German Empire
- 11 Nov 1918-31 Mar 1939: Village, Ostrołęka Powiat, Białystok Voivodeship, Second Polish Republic
- 01 Apr 1939-31 Aug 1939: Village, Ostrołęka Powiat, Warsaw Voivodeship, Second Polish Republic
- 01 Sep 1939-27 Jun 1945: Village, Regierungsbezirk Zichenau, Province of East Prussia, German Reich
- 28 Jun 1945-21 Jul 1952: Village, Ostrołęka Powiat, Warsaw Voivodeship, Republic of Poland
- 22 Jul 1952-31 May 1975: Village, Ostrołęka Powiat, Warsaw Voivodeship, Polish People’s Republic
- 01 Jun 1975-30 Dec 1989: Village, Ostrołęka Voivodeship, Polish People’s Republic
- 31 Dec 1989-30 Dec 1998: Village, Ostrołęka Voivodeship, Third Polish Republic
- 31 Dec 1998-Present: Village, Ostrołęka Powiat, Masovian Voivodeship, Third Polish Republic
The administrative structure of the parishes of Kleczkowo, Piski, and Rzekuń can be described as follows:
- 01 Jul 1569-03 Oct 1795: Village, Łomża Ziemia, Masovian Voivodeship, Province of Greater Poland, Polish-Lithuanian Commonwealth
- 04 Oct 1795-13 Oct 1809: Village, Kammerdepartement Płock, Province of New East Prussia, Kingdom of Prussia
- 14 Oct 1809-09 Jun 1815: Village, Ostrołęka Powiat, Płock Department, Duchy of Warsaw
- 09 Jun 1815-15 Jan 1816: Village, Ostrołęka Powiat, Płock Department, Congress Kingdom of Poland
- 16 Jan 1816-06 Mar 1837: Village, Ostrołęka Obwód, Płock Voivodeship, Congress Kingdom of Poland
- 07 Mar 1837-1842: Village, Ostrołęka Obwód, Płock Gubernia, Congress Kingdom of Poland
- 1842-1844: Village, Ostrołęka Powiat, Płock Gubernia, Congress Kingdom of Poland
- 1844-30 Dec 1866: Village, Ostrołęka Powiat, Płock Gubernia, Congress Kingdom of Poland
- 31 Dec 1866-17 Oct 1915: Village, Ostrołęka Powiat, Łomża Gubernia, Congress Kingdom of Poland
- 18 Oct 1915-10 Nov 1918: Village, Ostrołęka Powiat, General Government of Warsaw, German Empire
- 11 Nov 1918-31 Mar 1939: Village, Ostrołęka Powiat, Białystok Voivodeship, Second Polish Republic
- 01 Apr 1939-31 Aug 1939: Village, Ostrołęka Powiat, Warsaw Voivodeship, Second Polish Republic
- 01 Sep 1939-21 Jun 1941: Village, Byelorussian Soviet Socialist Republic, USSR
- 22 Jun 1941-27 Jun 1945: Village, Regierungsbezirk Zichenau, Province of East Prussia, German Reich
- 28 Jun 1945-21 Jul 1952: Village, Ostrołęka Powiat, Białystok Voivodeship, Republic of Poland
- 22 Jul 1952-31 May 1975: Village, Ostrołęka Powiat, Warsaw Voivodeship, Polish People’s Republic
- 01 Jun 1975-30 Dec 1989: Village, Ostrołęka Voivodeship, Polish People’s Republic
- 31 Dec 1989-30 Dec 1998: Village, Ostrołęka Voivodeship, Third Polish Republic
- 31 Dec 1998-Present: Village, Ostrołęka Powiat, Masovian Voivodeship, Third Polish Republic
Copyright © 2023 by Stephen J. Danko
