projects / irc / rizon / acid.git / blame
| Commit | Line | Data |
|---|---|---|
| e02c451f DO |
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 -=- |