Click on the blue EDDM Online Tool button:
On the resulting screen, enter the zip code, and click search:
You will be presented with a map of the zip code and eligible routes will display in pink. You can use the + and - buttons in lower, right-hand corner of map to increase the size of the map.
If you hover your mouse over the routes on the map, you'll see they change to a darker pink. If you actually click on one, you'll see the route number and number of recipients listed underneath the headers above the map. This lets you know how many are in each route. In this example, the route is R002 and contains 507 residential and 12 business recipients.