We developed 10 polymorphic microsatellite loci for Yellow-billed Magpies (Pica nuttalli). The primers were tested across a population of 57 Central California Yellow-billed Magpies and displayed an average of 3.9 alleles per locus. Forty-one American Crows (Corvus brachyrhynchos) from California were polymorphic for seven of the loci with an average of 2.9 alleles per locus. One additional microsatellite-containing locus displayed diagnostic allele sizes and may be useful to distinguish between the two species. These corvid specific microsatellites will aid ecological studies of the population-level effects of diseases, such as West Nile virus.