The US Census Bureau has tab-delimited data for zip/postal code to latitude/longitude coordinates. If you want a pretty authoritative dataset and only care about the 50 US states, the District of Columbia, and Puerto Rico, it's a pretty good resource.
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The US Census Bureau has tab-delimited data for zip/postal code to latitude/longitude coordinates. If you want a pretty authoritative dataset and only care about the 50 US states, the District of Columbia, and Puerto Rico, it's a pretty good resource.