We report the discovery of 25 previously unknown galaxies in the zone of avoidance (ZoA). Our systematic search for extended extragalactic sources in the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) and MIPS Galactic Plane Survey (MIPSGAL) mid-infrared surveys of the Galactic plane has revealed two overdensities of these sources, located around L 47 deg and 55 deg and \b\ 1 deg in the Sagitta-Aquila region. These overdensities are consistent ...