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Commit | Line | Data |
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1 | CivicSpace US ZIP Code Database | |
2 | -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- | |
3 | written by Schuyler Erle <schuyler@geocoder.us> | |
4 | 5 August 2004 | |
5 | ||
6 | The ZIP code database contained in 'zipcode.csv' contains 43204 ZIP | |
7 | codes for the continetal United States, Alaska, Hawaii, Puerto Rico, | |
8 | and American Samoa. The database is in comma separated value format, | |
9 | with columns for ZIP code, city, state, latitude, longitude, timezone | |
10 | (offset from GMT), and daylight savings time flag (1 if DST is observed | |
11 | in this ZIP code and 0 if not). | |
12 | ||
13 | This database was composed using ZIP code gazetteers from the US Census | |
14 | Bureau from 1999 and 2000, augmented with additional ZIP code information | |
15 | from the Census Bureau's TIGER/Line 2003 data set. Timezone information | |
16 | was added using cartographic data sets from nationalatlas.gov. The | |
17 | database is guaranteed to exclusively contain information gathered from | |
18 | sources in the public domain, and thus be legal to redistribute. | |
19 | ||
20 | The database is believed to contain over 98% of the ZIP Codes in current | |
21 | use in the United States. The remaining ZIP Codes absent from this | |
22 | database are entirely PO Box or Firm ZIP codes added in the last five | |
23 | years, which are no longer published by the Census Bureau, but in any | |
24 | event serve a very small minority of the population (probably on the | |
25 | order of .1% or less). Although every attempt has been made to filter | |
26 | them out, this data set may contain up to .5% false positives, that is, | |
27 | ZIP codes that do not exist or are no longer in use but are included due | |
28 | to erroneous data sources. The latitude and longitude given for each ZIP | |
29 | code is typically (though not always) the geographic centroid of the ZIP | |
30 | code; in any event, the location given can generally be expected to lie | |
31 | somewhere within the ZIP code's "boundaries". | |
32 | ||
33 | The database andthis README are copyright 2004 CivicSpace Labs, Inc., | |
34 | and are published under a Creative Commons Attribution-ShareAlike | |
35 | license, which requires that all updates must be released under the same | |
36 | license. See http://creativecommons.org/licenses/by-sa/2.0/ for more | |
37 | details. Please contact schuyler@geocoder.us if you are interested in | |
38 | receiving updates to this database as they become available. | |
39 | ||
40 | -=- 30 -=- |