This file contains SNP genotype data in genepop format (.gen) for 9864 loci from two blue crab populations : Agawam river MA (AR populatioN) and Panama City Beach, FL (PCB population). Genotype data were filtered for coverage and >85% genotypes called for individuals, and HWE, but not for linkage disequilibrium (LD). Data were exported from Stacks v.1.34 or above