ZIP to Latitude and Longitude conversion service is down

We are sorry for your inconvenience. We rely on the US Gazetteer to do the Zip to latitude and longitude conversion. This web service is down. We are working to resolve this. If you know the latitude and longitude of your location, you could enter them directly and get the declination and other magnetic field values.

A ZIP vs. latitude and longitude table is available at US Gazetteer . You may also use Getty Thesaurus or the USGS GNIS system to obtain the latitude and longitude of your location.