I am confused about the mailing address for contributions from the United States. My contribution envelope says the zip code is 10117-2429 but aa.org says the zip code is 10116-2407. Which is the correct zip code?

There are two different zip codes because of the way the US Post Office has set up their systems. Zip code 10117-2429 is used only on pre-printed contribution envelopes, available from GSO. 10116-2407 is for use when the contributor is using their own envelope.