Researching Polish/German/Prussian Ancestors from Posen
I was surprised to learn my great-grandfather renounced his allegiance to the Emperor of Germany when he became a citizen of the United States in 1887. I knew he was Polish! This is where the history part of family history becomes important.
The country of Poland did not officially exist when many of our ancestors immigrated to the United States. The Polish–Lithuanian Commonwealth had been partitioned by the Kingdom of Prussia, the Russian Empire, and Habsburg Austria in 1772, 1793, and 1795. Ethnically Polish immigrants were listed with German, Russian, or Austrian nationalities in the records, and their places of origin were given with Polish, German, or Russian names. The Latin versions of the place names were listed in Roman Catholic church records. These are research challenges.
Here is a Prussian map from the late 1800s, with the areas that with a few boundary changes, became officially part of Poland after World War I and World War II:
- 2 East Prussia
- 13 West Prussia
- 7 Pomerania
- 8 Posen
- 12 Silesia

While my father’s ancestors came from West Prussia, allied families identified as German came from East Prussia, Silesia, and Posen.
Posen was the German name of the provincial city as well as the Prussian province. The province of Posen was divided into two government regions (Regierungsbezirke), named Posen (Poznań) and Bromberg (Bydgoszcz). These regions were again subdivided into districts called Kreise, similar to counties.
Of course, these districts had both German and Polish names. The following is a list, with links, from Wikipedia.
| Kreis (“County”) | Polish spelling | Origin |
| City of Posen | Poznań | |
| Adelnau | Odolanów | |
| Birnbaum | Miedzychód | |
| Bomst | Babimost | |
| Fraustadt | Wschowa | |
| Gostyn | Gostyn | Kröben |
| Grätz | Grodzisk | Buk |
| Jarotschin | Jarocin | Pleschen |
| Kempen | Kępno | Schildberg |
| Koschmin | Koźmin | Krotoschin |
| Kosten | Kościan | |
| Krotoschin | Krotoszyn | |
| Lissa | Leszno | Fraustadt |
| Meseritz | Międzyrzecz | |
| Neutomischel | Nowy Tomyśl | Buk |
| Obornik | Oborniki | |
| Ostrowo | Ostrów | ?Adelnau? |
| Pleschen | Pleszew | |
| Posen Ost | Poznań, Wsch. | Posen |
| Posen West | Poznań, Zach. | Posen |
| Rawitsch | Rawicz | Kröben |
| Samter | Szamotuły | |
| Schildberg | Ostrzeszów | |
| Schmiegel | Śmigiel | Kosten |
| Schrimm | Śrem | |
| Schroda | Środa | |
| Schwerin | Skwierzyna | Birnbaum – 1877 |
| Wreschen | Września | |
| City of Bromberg | Bydgoszcz | |
| Bromberg | Bydgoszcz | |
| Czarnikau | Czarników | |
| Filehne | Wieleń | Czarnikau |
| Gnesen | Gniezno | |
| Hohensalza | Inowrocław | |
| Kolmar | Chodzież | |
| Mogilno | Mogilno | |
| Schubin | Szubin | |
| Strelno | Strzelno | ?? |
| Wirsitz | Wyrzysk | |
| Witkowo | Witkowo | ?Gnesen? |
| Wongrowitz | Wągrowiec | |
| Znin | Żnin | ?? |
A search for places of the old German Posen province at Kartenmeister.com lists 12,936 entries, including duplicate and alternative spellings for villages, cities, and towns.
This region was historically known as Wielkopolska, or Greater Poland (Großpolen in German). The major city is Poznań. There is considerable overlap with the present-day Greater Poland Voivodeship, województwo wielkopolskie in Polish.

In the twenty first century, Poznań is both a city and a powiat (county) in the Greater Poland Voivodeship. Powiat Poznań contains the towns Swarzędz, Luboń, Mosina, Murowana Goślina, Puszczykowo, Kostrzyn, Pobiedziska, Kórnik, Buk, and Stęszew. Each of the towns is associated with about a dozen villages, some which are identified on the map below.

Immigrants who said that they came from Posen may have been referring to the city, the nearby villages or towns, or the German province. Although the Poznan Project has been very helpful in indexing marriage records from the German province of Posen/Poznań from 1800 to 1899, it is not complete. Volunteers at Projekt BaSIA are currently indexing many records from this area. Other German and Polish place names can be found on Kartenmeister.com and Meyer’s Gazetteer, as well as on old and contemporary maps. While their results are available at no charge, please consider volunteering or donating to these efforts if they can help you in your research.
Sources
File:Prussiamap.gif. (2014, November 25). Wikimedia Commons, the free media repository. Retrieved 17:15, September 27, 2018 from https://commons.wikimedia.org/w/index.php?title=File:Prussiamap.gif&oldid=140555672.
Wikipedia contributors. (2018, September 20). Districts of Prussia. In Wikipedia, The Free Encyclopedia. Retrieved 17:17, September 27, 2018, from https://en.wikipedia.org/w/index.php?title=Districts_of_Prussia&oldid=860414056
File:Prowincja Poznańska de.svg. (2018, January 9). Wikimedia Commons, the free media repository. Retrieved 17:18, September 27, 2018 from https://commons.wikimedia.org/w/index.php?title=File:Prowincja_Pozna%C5%84ska_de.svg&oldid=278217654.
Wikipedia contributors. (2018, September 26). Poznań. In Wikipedia, The Free Encyclopedia. Retrieved 17:19, September 27, 2018, from https://en.wikipedia.org/w/index.php?title=Pozna%C5%84&oldid=861254372
File:Poznańskie kaliskie.png. (2018, June 8). Wikimedia Commons, the free media repository. Retrieved 17:20, September 27, 2018 from https://commons.wikimedia.org/w/index.php?title=File:Pozna%C5%84skie_kaliskie.png&oldid=305225584.
Wikipedia contributors. (2018, September 21). Poznań County. In Wikipedia, The Free Encyclopedia. Retrieved 17:23, September 27, 2018, from https://en.wikipedia.org/w/index.php?title=Pozna%C5%84_County&oldid=860512701
By Poznaniak [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)%5D, via Wikimedia Commons