Google has added zip code matches and lookups to the knowledge graph section of the search results.
If you search for [new york, ny zip codes] in Google, you will be presented with all of the zip codes in that location. This loads a carousel that lets you slide through the various options:
Bing also offers the zip code matches for these types of results. If you search on Bing for [new york, ny zip codes you get the following result:
More on the source: Google Zip Code Listings Now In Search Results