There are several ways to add a zip code to your count or order:

Enter by Zip Code - Enter the first 3, 4 or 5 digits of a zip code
837 Returns all zip codes starting with 837
8370 Returns all zip codes starting with 8370
83704 Returns just the single zip code 83704
83704, 83705, ... Returns multiple 5-digit zip codes

Enter by City - Enter the city, state to return related zip codes
Pittsburgh Returns all zip codes in Pittsburgh
Columbus, OH Returns all zip codes Columbus, OH
    Note: State is required when the city isn't unique

Enter by County - Enter the county, state to return zip codes
Dade, FL Returns all zip codes in Dade county
    Note: State is required when searching by county

Enter by Area Code - Enter the area code to return zip codes
(202) All zip codes in the 202 area code
(208) All zip codes in Idaho