Why 5-Digit Zip Codes Don’t Always Return Correct Sales Tax Rates (And That’s OK)

http://blog.taxjar.com/zip-codes-sales-tax/

Sales Tax Rates: ZIP Codes Vs Geolocation

http://www.avalara.com/learn/videos/sales-tax-rates-zip-codes-vs-geolocation/

Getting the Right Sales Tax Rate: ZIP Codes vs. Geolocation – Will’s Whiteboard

http://www.avalara.com/blog/2015/08/13/getting-the-right-sales-tax-rate-zip-codes-vs-geolocation-wills-whiteboard/

What’s the smallest Sales Tax Jurisdiction in the country?

http://developer.avalara.com/blog/2015/07/22/wacky-sales-tax-facts-2

Using Zip Plus 4 To Increase Tax Reporting Accuracy

http://www.taxconnex.com/blog-/using-zip-plus-4-to-increase-tax-reporting-accuracy

Weekly Roundup: Tax Amnesty, Soda, and Zip Codes

http://www.avalara.com/blog/2014/08/22/weekly-roundup-tax-amnesty-soda-and-zip-codes/

California: Relying on Zip Codes for Sales Tax Causes Confusion

http://www.taxrates.com/blog/2014/08/18/california-relying-zip-codes-sales-tax-causes-confusion/

Don't use zip codes for sales tax rate lookups

http://salestaxguy.blogspot.com/2014/06/dont-use-zip-codes-for-sales-tax-rate.html?spref=tw

A Bite out of Apple: Zip Codes Strike Again

http://www.salestaxdatalink.com/bite-apple-zip-codes-strike/