While the main olfactory system is tuned to detect general chemosensory stimuli, the accessory olfactory system integrates semiochemicals and other socially relevant chemostimuli. This duality of the main and accessory olfactory pathways is reflected by separate peripheral sensory organs as well as the main and accessory olfactory bulbs, which comprise entirely separate primary sensory circuits. Notably, downstream convergence of main and accessory olfactory bulb principal neuron projections remains elusive. Here, we set out to analyze these axonal projections and investigate neural physiology at potential integration sites. We, therefore, implemented targeted transduction olfactory bulb principal neurons using stereotactic microinjections of adeno-associated viruses and Cre-dependent expression of viral genomes. High-resolution confocal imaging of largely intact serial brain slices enabled brain-wide screening of axonal projection patterns, demonstrating convergence in nuclei of the amygdala. Consequently, we describe the physiology and morphology of neuronal populations in these potential amygdaloid integration nuclei using single-cell patch-clamp recordings in acute slices. Altogether, we describe axonal innervation of main and accessory olfactory bulb principal neurons in both unique and common central nuclei and use single-cell morphology and physiology to disentangle the basis for central integration of both main and accessory olfactory information.