No. You can verify this at sites that give numerical listings of zip codes, like http://encyclopedia.thefreedictionary.com/List%20of%20ZIP%20Codes%20in%20Iowa Here's some trivia: The ZIP (Zone Improvement Plan) is a 5-digit code that marks a specific geographical region in the US. Made up of three parts, the first digit (90210) represents the broad region in the country, ranging from the number one in the Northeast, to nine in the far West. The second part of the code is composed of two digits (90210) that provide a more detailed breakdown of the area in question, narrowed down by population masses and transportation systems that give access to sectional centers (which is Post Office Department lingo for concentrated areas of population). The last two digits (90210), making up the final part of the zip code, represent the postal zones in larger cities and their assigned smaller post offices. In 1983, the ZIP+4 code was introduced to further divide areas so as to accelerate the delivery speed of letters and parcels. The ZIP+4 code consists of the regular five-digit number, along with an added hyphen and four extra digits. The first two of these digits (90210-1234) represent a delivery sector that's made up of a specified number of blocks or streets within a neighborhood, a group of office buildings, a large apartment building, or even a selection of post office boxes. The last two additional numbers (90210-1234) stand for a delivery segment, which represent anything from all addresses on one side of the street between intersections to one entire floor in a building or even particular departments in a company. ---http://www.askmen.com/toys/special_feature/25_special_feature.html