How do we determine a zip code's category?
A zip code is broken up into square miles with a population associated to each. Those are then averaged for a given zip code and a designation assigned based on the criteria below:

• Rural: Less than 1000 people per square mile
• Suburban: 1000-3000 people per square mile
• Urban: More than 3000 people per square mile

What are the limits?
For Physicians and Medical Professionals, urban searches are limited to 15 miles; suburban searches to 35 miles; rural searches to 75 miles.

For Primary Care Dentists, urban searches are limited to 15 miles; suburban searches to 35 miles; rural searches to 75 miles.

For Dental Specialists and All Dental Providers, urban and suburban searches are limited to 40 miles; rural searches to 75 miles.

For Medical Hospitals and Mental Health/Substance Abuse Facilities, urban searches are limited to 25 miles; suburban searches to 30 miles; rural searches to 100 miles.

For Facilities, Pharmacies, and Vision locations, urban searches are limited to 15 miles; suburban searches to 40 miles; rural searches to 80 miles.