Junius is a town in Seneca County, New York, United States. The population was 1,370 at the 2020 census. The Town of Junius is in the northwest corner of the county and is east of Geneva, New York. There is no post office in the Town of Junius. The primary postal district covering much of the area is ZIP Code 14433 for Clyde. Other sections of the town have either a Zip Code of 13165 for Waterloo, ZIP Code 14489 for Lyons or ZIP Code 14532 for Phelps. Government offices for the town are located in Dublin.