A comprehensive .txt or .csv file containing approximately 165,000+ entries of U.S. populated places, zip codes, or street-level data. Where to find it:
Below are write-ups for the most common datasets matching your description. Option 1: USA Geographic/Postal Data (Zips & Towns) Download 165K USA txt
They offer a free USA postal code database in text format. A comprehensive
Many developers host wordlists specifically for programming. 000+ entries of U.S. populated places
If you are looking for a text-based database of U.S. cities, zip codes, and geographic coordinates, you are likely looking for data used for mapping or logistics.