Only 50% of the time, but that’s 50% better of a guess than you’d make without knowing gender. ZIP codes contain maybe 40K residents [0] (many contain fewer) a

Only 50% of the time, but that’s 50% better of a guess than you’d make without knowing gender. ZIP codes contain maybe 40K residents [0] (many contain fewer) and there have been around 25K days in the last 70 years. Sure births are not evenly distributed, but still... [0] https://www.unitedstateszipcodes.org/images/comparison-of-population-estimates.png https://www.unitedstateszipcodes.org/images/comparison-of-po...