| Laatz | CZ Ledce | ||
| Laband | PL Labedy | ||
| Labiau | RUS Polessk | ||
| Ladekopp | PL Lubiesco | ||
| Laibach | YU Ljubljana | ||
| Lamsdorf | PL Lambinowice | ||
| Landeshut | PL Kamienica Gora | ||
| Landsberg an der Warthe | PL Gorzow Wielkopolski | ||
| Landskron | CZ Lanskroun | ||
| Landstraß | YU Konstanjevica | ||
| Langenau | PL Legnowo | ||
| Langendorf | RUS Margunow | ||
| Lasdehnen | RUS Krasnosnamensk | ||
| Lassin | PL Lasin | ||
| Laubendorf | CZ Limberk | ||
| Laubitten>Lautenbach | RUS Dobrino | ||
| Laubnitz | SRB Lubanice | ||
| Lauenburg | PL Lebork | ||
| Lauknen>Hohenbruch | |||
| Laun | CZ Louny | ||
| Laurahütte | PL Siemianowice | ||
| Lauske | PL Dlosko | ||
| Lauske | PL Krasne-Dlusko | ||
| Lautenbach<Laubitten | RUS Dobrino | ||
| Lautschin | CZ Coucim | ||
| Lechwitz | CZ Lechovice | ||
| Leipe | PL Lipno | ||
| Leipertitz | CZ Litobratrice | ||
| Leitmeritz | CZ Litomerice | ||
| Leißow | PL Lisow | ||
| Lemberg | UA Lviv | PL Lwow | |
| Lengenfeld | SLO Dovje | ||
| Leningrad>St.Peterburg | RUS St.Peterburg <–Leningrad |
||
| Leschnau | PL Leszno | ||
| Leschnitz | PL Lesnica | ||
| Leslau | PL Wloclawek | ||
| Leubus | PL Lubiaz | ||
| Leutschau | SK Levoca | H Locse | |
| Lewin<Hummelstadt | |||
| Libau | LV Liepaja | ||
| Libschitz | CZ Libcice n. Vlt. | ||
| Lichau | PL Lichnowy | ||
| Lichtenwald | SLO Sevnica | ||
| Liditz | CZ Lidice | ||
| Liebenfelde | RUS Salese oder Slasje | ||
| Liebenfelde<Millauken | RUS | ||
| Liegnitz | PL Legnica | ||
| Lischau | CZ Lisov | ||
| Lissa | PL Leszno | ||
| Littai | SLO Litija | ||
| Lobenstein | CZ Uvalno | ||
| Lobositz | CZ Lovosice | ||
| Lodenitz | CZ Lodenice | ||
| Lötzen | PL Gizycko | ||
| Löwen (LUX) | F Louvain | ||
| Loiblpaß | SLO Ljubeli | ||
| Loslau | PL Wlodzislaw Slaski | ||
| Lowkowitz –> Bienendorf | PL Lowkowice | ||
| Luditz | CZ Zlutice | ||
| Ludwigsdorf | PL Ludwikovice | ||
| Lüben | PL Lubin | ||
| Lützelburg | NL Luxemburg | F Luxembourg | |
| Lundenburg | CZ Breclav | ||
| Luttenberg | SLO Ljutomer | ||
| Lyck | PL Elk |