ZIP Code Finder and Boundaries map of the entire us. Useful for densely populated areas which have been subdivided.
A current list of all existing ice houses can be found on the Ice House America web site.
Sitewise is a smartphone app which provides demographic data for a selected area based on a defined radius or drive-time from a specific location. Limited census data is provided with the app and more detailed/up-to-date information can be obtained through subscription.