Last week, Amazon rolled out an ambitious new effort to continue destroying Denver’s traditional retail market. Now, thanks to the painstaking work of real-estate broker Jason Rogers, we know just how far those deliveries can go.

As you’ve probably read, Prime Now promises to deliver certain household goods and food within an hour or two.

It’s a complex system that relies on new warehouse facilities and the Amazon Flex service, which pays Uber-style contractors to deliver packages to your door.

Rogers figured out its initial range by manually inputting ZIP codes to Prime Now.

Here are the results:

(If you’re having trouble using this, try this version. You can also simply check through Amazon if you’re eligible. Look in the top-left corner here.)

As Rogers points out on his blog, the entire central Denver area is covered, but the southern suburbs of Centennial, Parker, Castle Rock and Lone Tree are for now excluded.

It also looks like Boulder is largely out, and that only a portion of Golden gets it. But that’s all likely to change as Amazon works out the kinks. As Emilie Rusch found, even those in the service area might be waiting longer than the promised two hours.