Area Code 603
Area code 603 is associated with New Hampshire, Vermont. It connects to 284 ZIP codes across 255 cities, with an estimated combined population of 1,318,822.
Area details
- Area code
- 603
- States covered
- New Hampshire, Vermont
- States count
- 2
- ZIP codes
- 284
- Cities
- 255
- Population
- ~1,318,822
Related ZIP codes
Open ZIP state pageAbout area code 603
Area code 603 is a useful lookup entry for New Hampshire, Vermont. It helps connect phone-number geography with ZIP code coverage, city clusters, and state-level browsing. Use the related ZIP cards above to move deeper into the postal data for this region.
If you are browsing by state, you can continue with New Hampshire lookup pages for ZIP codes and area codes.