(ZIP+4 or ZIP plus 4) Extension of the United States postal code providing four extra digits for additional location specificity.

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Convert Zip+4 to Lat-Long

I have a need to convert about 1 million Zip+4 records to Latitude/Longitude for mapping but cannot find anything that is granular enough in output. Is there an easy way to convert this information?
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28 views

Georeference by Zipcode failed for 7 of 133 zips

I am georeferencing/geocoding a 133 record table with CartoDB. 7 of the 133 failed to georeference, i.e. I got null in the geometry column. I checked for spaces, i's & l's instead of 1's, o's ...
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200 views

Address to Zip+4 ArcGIS Address Locator or batch service? Free?

I have 200,000 addresses in MD for which I need zip+4. I am searching for an address locator for ArcGIS or a (free?) batch service that will output 9-digit zip (Zip+4) from address. I have already ...
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2answers
325 views

Samples of US Residential or business addresses without zip+4?

I'm looking for a few deliverable residential or business addresses without a zip+4. By "residential or business", I mean, not a PO box and not military addresses. According to this answer on ...
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1answer
151 views

Zip + 4 Centroids

I have a data set with ZIP +4 codes, and ideally, I'd like to map them (their centroids) as points. I'm not interested in their boundaries (since they're not really geographies anyway). Does anyone ...
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1answer
130 views

How Trusted is ZipInfo.com's data?

I'm not in GIS, and I'm working on a nutty redball express project that involves matching some zip+4 data to congressional districts for the upcoming 113th congress. We have found very few sources of ...
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2answers
223 views

Mapping zipcode to legislative district [closed]

Did anyone work with SunLight foundation data to map the zipcodes with legislative district data. I have to work with Illinois zipcodes only.
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121 views

Vendor who sells Zip+4 from Semaphore corporation [closed]

I need a vendor who sells zip4 CD from Semaphore corporation. I would like to input the address data and zip and then mapped/output that correct address and Zip+4.
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3k views

Where can I find a list of non deliverable zip codes

Here is an interesting problem I am facing... There are certain areas within the US where the USPS does not offer postal delivery to those addresses. One example here is my Zipcode 92067 which is ...