WA:http://www.naco.org/template.cfm?section=find_a_county&template=/cffiles/counties/state.cfm&statecode=wa
OR: http://www.naco.org/template.cfm?section=find_a_county&template=/cffiles/counties/state.cfm&statecode=or
CA: http://www.naco.org/template.cfm?section=find_a_county&template=/cffiles/counties/state.cfm&statecode=ca

ZIP + 4 Code Look-up
Requires company name, P.O. Box or street address, plus either the ZIP code or the city and
state to find the "ZIP+4" code. Includes county name, carrier route number and delivery point.
http://www.usps.com/ncsc/lookups/lookup_zip+4.html


Postal Abbreviations

Official Postal Abbreviations, United States Postal Service
Provides abbreviations for states, military "states" and street suffixes (i.e., "Avenue" should be
abbreviated "AVE", not "AVN".)
http://www.usps.com/ncsc/lookups/usps_abbreviations.html

Find Area Codes

USA Area Code Maps - All States
http://www.nanpa.com/number_resource_info/area_code_maps.html

Canada Area Code Map
http://www.cnac.ca/npa_codes/npa_map.htm

City / ZIP Reverse Look-up

WA: http://www.myzipcodemap.com/state.php?state=Washington 
OR: http://www.myzipcodemap.com/state.php?state=Oregon 
CA:  http://www.myzipcodemap.com/state.php?state=California

United States Postal Service
Find City and State by ZIP Code (or ZIP Code by City and State).
http://zip4.usps.com/zip4/citytown_zip.jsp

ZIP Info
Find City and State by Zip Code (or Zip Code by City and State). Also provides area code,
county name, time zone, latitude and longitude, FIPS code and MSA/PMSA.
http://www.zipinfo.com/search/zipcode.htm