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http://zipinfo.com/search/zipcode.htm
Free zipcode lookup with areacode, county, latitude, longitude, MSA, PMSA, congressional district, FIPS code, and timezone. Updated monthly.
Keywords: fips, msa, pmsa, us postal service, usa, usps, zip code, zip codes, zip+4, zip code, zip codes, zipcode, zipcodes, area code, area codes, areacode, areacodes, cities, city, congressional district, counties, county, directory, fips, geo code, geo codes, geocode, geocodes, latitude, list, longitude, lookup, msa, phone, pmsa, postal, state, states, telephone, time zone, time zones, timezone, timezones, usps, zip code, zip codes, zip+4, zipcodes, zipcode
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http://www.fcc.gov/Bureaus/Common_Carrier/Factsheets/areacode.html
The Federal Communications Commission answers frequently asked questions regarding area codes.
Keywords:
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http://frodo.bruderhof.com/areacode/
Lists of exchanges that have moved or are moving from one North American area code to another.
Keywords: change, new, split, area code
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