Three of the more prominent ZIP codes in the city of Denver are 80202, 80203 and 80205. These ZIP codes cover parts of the downtown Denver area and contain important buildings such as the Colorado State House, the Colorado Convention Center, the Denver City and County Building and Coors Field.
The Zone Improvement Plan began assigning five-digit codes to post office branches across the country in 1963 as a means by which the federal government could help make sorting mail easier. The three wealthiest ZIP codes in Colorado happen to be in Denver, according to data reported from Experian. These ZIP codes are 80209, 80293 and 80202.