Idavere (Itfer) — knight manor in Haljala Parish, Virumaa County
Iigaste (Igast) — knight manor in Sangaste Parish, Tartumaa County
Iisaku (Isaak) — a parish in Virumaa County
Iisaku church manor (Pastorat Isaak) — in Iisaku Parish, Virumaa County
Iisaku (Isaak) — knight manor in Iisaku Parish, Virumaa County
Illuka (Illuck) — knight manor in Jõhvi Parish, Virumaa County
Illuste (Illust) — support manor of Paatsalu manor, Karuse Parish, Läänemaa County
Ilmatsalu (Ilmazahl) — knight manor in Tartu-Maarja Parish, Tartumaa County
Ilmjärve (Ilmjärw) — state manor in Otepää Parish, Tartumaa County
Ilpla (Ilpel) — state manor in Püha Parish, Saaremaa County
Imastu (Mönnikorb) — knight manor in Kadrina Parish, Virumaa County
Imavere (Immafer) — knight manor in Pilistvere Parish, Viljandimaa County
Imukvere (Immofer) — knight manor in Palamuse Parish, Tartumaa County
Ingliste (Haehl) — knight manor in Juuru Parish, Harjumaa County
Inju (Innis) — knight manor in Viru-Jaagupi Parish, Virumaa County
Inju-Aru (Arrohof) — semi-manor in Viru-Jaagupi Parish, Virumaa County
Issaku (Issako) — support manor of Kurista manor, in Võnnu Parish, Tartumaa County