Why does the IRS have its own zip codes in the United States?

Question

Why does the IRS have its own zip codes in the United States?

In: 76

Answer 1

Zip codes aren’t really that scientific. Others have mentioned that there are special zip codes for the Pentagon, buildings and Universities.

In theory you could have a single house or mail box be its own zip code. Probably would need to blackmail someone to get this, but technically feasible and nothing really wrong with it.