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The census will generate that database for you:

Click "All 5-Digit ZIP Code Tabulation Areas"

Click "GO"

Click "P1. Total Population"

Click "Add"

Click "Next"

Click "Start Download"

> don't spread it around Why not? Is it not public domain, or are you worried about the load on your server, or what?

The latter. You're free to upload it elsewhere and spread it, however.

That seems useful, but it's more aggregated data (by state & region, not zip).

bzip2 it. It will slash the size to a fraction of its current size.

A small mirror.