This useful tool will give you an exact value by entering your zip code......
http://www.ngdc.noaa.gov/seg/geomag/jsp/struts/calcDeclination
http://en.wikipedia.org/wiki/Magnetic_declination
http://www.ngdc.noaa.gov/seg/geomag/jsp/struts/calcDeclination
http://en.wikipedia.org/wiki/Magnetic_declination
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