Share to Twitter Share to Facebook. Blogger Comments Facebook Comments. Anonymous 8 April at Anonymous 25 June at Anonymous 16 September at Anonymous 4 October at Anonymous 5 November at Anonymous 11 December at Unknown 19 February at Unknown 30 March at Anonymous 31 March at Unknown 16 April at Anonymous 21 April at Anonymous 29 July at Anonymous 2 August at Unknown 20 August at Unknown 6 August at Unknown 13 August at Anonymous 17 August at Unknown 21 August at Anonymous 26 August at 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. ZCTAs were developed to account for some of the difficulties in assigning an area to a ZIP code and to precisely define a geographic area.
In general, they are updated once every 10 years for the Census. The Census assigns an area to a ZCTA according to census blocks the smallest geographic unit used by the census. Imagine a city block that makes up a typical census block as pictured to the right. It is bounded on all 4 sides by portions of city streets that each have their own name and addresses.
The issue is that census blocks almost always split down the middle of the street. ZIP codes rarely do because that would require two postal workers delivering mail to that street - one for each side of the street.
In the example, one mail carrier may deliver to 3 sides of the block via one ZIP code while another mail carrier delivers mail on the other street in a different ZIP code. When this happens, the Census Bureau will assign the entire block to a single ZCTA in this case, because the census block is the area that is precisely measured. If you are getting very precise usually a matter of meters, not miles , census block boundaries near the edge of a ZIP code almost always split ZIP codes.
The statistics provided by the Census Bureau can give insight into the demographics within the ZIP code. For instance, see our ZIP code rankings. Remember that ZIP codes were made to make mail delivery easier.
They weren't made to correspond to existing boundaries such as cities, counties, or even states. If it is more efficient for a mail carrier to drive across a state line to deliver mail, the ZIP code "boundary" will cross the state lines.
The 9-digit ZIP Code consists of two sections. The first five digits indicate the destination post office or delivery area. The last 4 digits represent specific delivery routes within delivery areas. It helped divide the country into different "zones" according to how mail was distributed , which accelerated sorting and delivery. ZIP "Zippy". They also released the ZIP Code jingle:. As the US population has increased and scattered since , it's been necessary to expand on the system, to make room for everybody and their dog.
That's where the "plus 4" part comes in. We're getting ahead of ourselves, though, so let's start with the basics. If you're mailing a letter from Boston to Seattle, the mail carrier in Massachusetts doesn't really care what the street address of the destination is. It's what you might call "outside his jurisdiction.
A postal worker can only cover so much ground on a given day. And since the USPS has a standard of delivering in rain, sleet or snow, that rules out the possibility of doing the service of delivering in stages some today, some tomorrow. That means that any given post office is only servicing what it can reach in a day.
ZIP Codes reflect that.
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