Site location information file, including site IDs, date of collection, and geographic coordinates.

Site, collection year, sample ID, and within population microsatellite DNA genetic diversity [sample size (N), observed heterozygosity (Ho), Hardy-Weinberg expected heterozygosity (He), allelic richness (A), rarified allelic richness (Ar), rarified number of private alleles (Ap), inbreeding effective size (Nei) and 95% confidence interval (CI)] for northern California tidewater goby populations (listed from north to south). Also included are site reference numbers for analysis using PHYLIP (1-36) and STRUCTURE (1-47).