What areas have Columbia mailing addresses?

• Most addresses use the name of the largest city in the region, even though the specific address may not be within the corporate limits of that city.
• In fact, it may not even be in the same county.
• In this example, several different five digit zip code areas are called Columbia.
• Therefore, a geocode of Columbia can be very ambiguous.
• This is one of the reasons the Zone Improvement Plan was developed.
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