Find us counties by zip code

As you can see from the map of the first 3 digits of zip codes , the digits after the first are also generally assigned from east to west. In the map, 0 is closer to white and 9 is much more vivid. It's easy to follow the gradient across each of the zones even though there are a few exceptions such as the southwest tip of Georgia which uses 39XXX like central Mississippi.

Despite the fact that ZIP codes seem to be geographic in nature, that wasn't their intended purpose. They are intended to group mail to allow the USPS to deliver mail more efficiently. Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient. In most cases, addresses in close proximity to each other are grouped in the same ZIP code which gives the appearance that ZIP codes are defined by a clear geographic boundary.

However, some ZIP codes have nothing to do with geogaphic areas. When ZIP codes appear to be geographically grouped, a clear shape cannot always be drawn around the ZIP code because ZIP codes are only assigned to a point of delivery and not the spaces between delivery points. In areas without a regular postal route or no mail delivery, ZIP codes may not be defined or have unclear boundaries.

The main issue is discussed above: there simply isn't always a clear geographic boundary for a ZIP code. The Census Bureau and many other commercial services will try to interpolate the data to create polygons shapes using straight lines to represent the approximate area covered by a ZIP code, but none of these maps are official or entirely accurate.

They provide a very close approximation of the area covered by a ZIP code. You can easily notice some of the boundary issues when viewing our maps. Very rural areas aren't labeled as belonging to a ZIP code such as much of Nevada and Utah where there are few, if any, addresses to deliver mail. If the address is on the same street as a ZIP code boundary on the map, be sure to search for the full street address to determine the ZIP code instead of relying on the map.

Their purpose is to convey statistical data about regions that are familiar to most citizens. As discussed above, it is difficult to precisely define a geographic area covered by a ZIP code. The webmaster will not forward messages to congressional offices. If you are having problems contacting your representative, you can report the problem using the Contact Webmaster form , write or call your elected representative, or visit the member's website for alternate contact information. If you know who your representative is but you are unable to contact them using their contact form, the Clerk of the House maintains addresses and phone numbers of all House members and Committees, or you may call for the U.

House switchboard operator. In addition, you may choose to visit your member's website directly for further information. There are several correct forms of address for a member of Congress including "The Honorable" and "Representative". The Find Your Representative service is provided as a public resource for identifying and contacting a constituent's elected representative. Skip to main content. Find Your Representative.

Step 2. Step 3. Step 5. In the "Output Fields" section of the results, look for "County Name". There you will see the county associated with the ZIP Code you entered.

You can also find county info using this method by submitting the name of a city instead of a ZIP Code. The process for finding a county by using a mailing address is very similar to finding a county using a ZIP Code.

However, it is not necessary to have the ZIP Code for this process. You can use a mailing address to find a county by using the following steps:. Go to the website of an address validation service provider of your choice.

For this example, we'll again use the SmartyStreets' address validation demo for Single Addresses. Look for "Step 2: Choose a lookup type" and choose "address components" from the dropdown menu.

Enter the address info into the respective form fields of "Step 3".