If you’ve used any zip-code radius based searches and wondered which regions fall under the radius, here’s a website we stumbled upon that can help you: maps.huge.info/zipcolors.htm. This website allows you to enter a zip code and plot the areas falling under that radius. Lets say we ask for a 10 mile radius around 95110…
…and we get a map with the 10 mile radius neatly marked.
The map website also gives you ways of listing the zip codes which fall under that encircled region.
There’s also a page which draws the zip regions over a Google map (try it); its great for some visual research.