The JRI-Poland database covers all areas that are currently or formerly part of Poland. These regions are:
- Congress Poland (gubernias that were part of Poland as of 1867-1917; all are currently part of Poland except for northern Suwałki Gubernia, which is part of Lithuania)
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- Kalisz Gubernia (main towns: Kalisz, Koło, Piątek, Wieruszów)
- Kielce Gubernia (main towns: Chęciny, Kielce, Stopnica)
- Łomża Gubernia (main towns: Grajewo, Łomża, Ostrów Mazowiecka, Szczuczyn, Tykocin)
- Lublin Gubernia (main towns: Chełm, Kazimierz Dolny, Lublin, Zamość)
- Piotrków Gubernia (main towns: Częstochowa, Łódź, Piotrków Trybunalski, Tomaszów Mazowiecka)
- Płock Gubernia (main towns: Ciechanów, Mlawa, Płock, Płońsk, Przasnysz)
- Radom Gubernia (main towns: Iłża, Opatów, Radom)
- Siedlce Gubernia (main towns: Biała Podlaska, Siedlce, Sokołów Podlaski)
- Suwałki Gubernia (main towns: Augustów, Mariampol, Sejny, Suwałki)
- Warszawa Gubernia (main towns: Góra Kalwaria, Pułtusk, Radzymin, Warszawa)
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- Austrian Galicia (voivodeships that were part of Poland between World War I and World War II; Kraków Voivodeship is currently part of Poland, Lwów Voivodeship is now split between Poland and Ukraine, and Stanisławów and Tarnopol Stanisławów Voivodeships are now part of Ukraine)
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- Kraków Voivodeship (main towns: Kraków, Tarnów)
- Lwów (Lviv) Voivodeship (main towns: Drohobycz, Lwów, Przemyśl, Rzeszów, Sambor)
- Stanisławów (Ivano-Frankivsk) Voivodeship (main towns: Horodenka, Kołomyja, Stanislawów, Stryj)
- Tarnopol (Ternopil) Voivodeship (main towns: Brzeżany, Jagielnica, Skałat, Tarnopol, Złoczów)
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- Prussia (portions of German provinces as of 1878 – 1918 that are now in Poland)
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- East Prussia (Prusy Wschodnie) Province (main town: Königsberg in Preussen (Kaliningrad))
- West Prussia (Prusy Zachodnie) Province (main town: Danzig (Gdańsk))
- Pomerania (Pomorskie) Province (main town: Stettin (Szczecin))
- Posen (Poznań) Province (main town: Posen (Poznań))
- Silesia (Śląsk) Province (main town: Breslau (Wrocław))
- Neumark (Lubusz) Province (main town: Küstrin (Kostrzyn nad Odrą))
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- Russian Pale (gubernias that were part of Poland between World War I and World War II; currently, the western one-third of Grodno Gubernia is part of Poland, the eastern two-thirds of Grodno Gubernia is part of Belarus, and Volynia Gubernia is part of Ukraine)
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- Grodno (Hrodno) Gubernia (main town: Bialystok)
- Volhynia (Wołyn) Gubernia (main town: Kremenets)