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Why Is It Needed?
Post Office delivery areas do not coincide with City boundaries
City designations tend to follow zip codes
Northglenn has several overlapping zip codes: 80233 (Thornton, Denver), 80234 (Westminster), 80241 (Thornton, Adams County)
When goods are delivered to an address in Northglenn, but with a Thornton zip code, Thornton tends to get the sales tax