| LABUS | Poland | 1780 | | | | |
| LAGOWSKI | Rzeszow | 1850 | | Duryea | PA | 1897 |
| LAMPARSKI | No.
Poland | | | | MI | 1889-1931 |
| LAMPARSKI | No.
Poland | | | | MI | 1889-1931 |
| LANGE | | 1857 | | Wayne | MI | 1882-1935 |
| LAPINSKI | Poznan | 1835-1879 | | Cook | IL | 1879-1905 |
| LASA | Poznan | | Rogowo | Cuyahoga | OH | 1893 |
| LASKOWICZ | Wilejski | | | | PA | 1912-1921 |
| LASOTA | Mydlow | | | | | |
| LASSA | Poznan | | Rogowo | Cuyahoga | OH | 1893 |
| LAURENDIO | Rzeszow | | Tarnow | | | |
| LEBRYK | Tarnow | 1870 | Lubcza | Lake | IN | 1907 |
| LECZIKOW | | | | | | |
| LEGUTKI | Tarnow | 1793 | | | | |
| LEJA | Warsaw | 1900 | | | CA | |
| LEMANSKI | Komza | 1600 | Kolna | Three Rivers | MA | 1910 |
| LEMKE | Hinter
Pommern | 1700 | Neustetin | | | |
| LENART | Nowy
Sacz | 1860-1900 | | | | |
| LEPINSKI | Poznan | 1835-1879 | | Cook | IL | 1879-1905 |
| LESE | | | | | IL | 1879-1954 |
| LESKIEWICZ | Vilno | | Wilejski | Cuyahoga | OH | 1918 |
| LESKOWICZ | Vilno | | Wilejski | Cuyahoga | OH | 1918 |
| LESNIKOWSKI | Olsztyn | 1750 | Nidzica | | | |
| LESZKOWICZ | Vilno | | Wilejski | Allegheny | PA | 1912-1921 |
| LEVANDOWSKI | Jaroszewo | 1826 | | Benton | MN | |
| LEVENDOWSKI | Jaroszewo | 1826 | | Benton | MN | |
| LEVINSKI | | 1910 | | Crawford | PA | 1910 |
| LEWANDOWSKI | Jaroszewo | 1826 | | Benton | MN | |
| LEWANDOWSKI | | 1890 | | | | |
| LIBUCHA | Galicia | 1750-1860 | Rzeszow | | | |
| LIGMAN | Lobzenica | 1870 | Wryzce | Cook | IL | 1888 |
| LIGMAN | Tuchel | 1825 | Wryzce | Cook | IL | 1891 |
| LIGMANOWSKI | Lobzenica | 1850-1996 | Wryzce | Cook | IL | 1888 |
| LILENTHAL | Krosno | 1920 | | | | |
| LIPINSKI | Poznan | 1835-1879 | | Cook | IL | 1879-1905 |
| LIRO | Tarnow | 1774-1850 | Tarnow | | | |
| LIS | Tarnow | 1876-1908 | Lisia
Gora | Cook | IL | 1908-1966 |
| LIS | Siedlce | 1890-1910 | | | IL | |
| LISIECKA | Lomza | 1800-1996 | Brezesko | | MD | |
| LISIK | | | Lubenia | Cook | IL | 1885-1921 |
| LISOWSKI | Konin | 1870 | Gniezno | Allegheny | PA | 1890 |
| LISZEWSKI | Lomza | 1800-1996 | Brezesko | | MD | |
| LITRA | Rzeszow | 1810 | | | | |
| LOCHMINSKI | | | | | | |
| LOMNICKI | | | | | | |
| LONGAWA | Krosno | 1920 | | | | |
| LOPACKA | Olsztyn | 1800 | Nidzica | | | |
| LUCARZ | Tarnow | 1847-1928 | Brzesko | | | |
| LUCARZ | Tarnow | 1868-1941 | Brzesko | | | |
| LUEBKE | Szczecinek | 1700-1800 | Pommern | | | |
| LUEPKE | Szczecinek | 1700-1800 | Pommern | | | |
| LUWACKY | | 1850-1900 | | | | |
| LYSY | Poznan | | Rogowo | Cuyahoga | OH | 1893 |
|