Guides to US addresses and ZIP codes

Practical guides on address formats, ZIP codes, area codes and test data, plus reference pages for every state and major city.

ZIP codes
West Virginia ZIP Codes: Ranges, Prefixes and Major Cities
All about West Virginia ZIP codes: the 24701–26886 range, three-digit prefixes, code types and ZIP codes for major WV cities.
City guides
Decatur, GA ZIP Codes, Area Codes and Address Format
Decatur, Georgia ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Decatur mail.
City guides
Las Vegas, NV ZIP Codes, Area Codes and Address Format
Las Vegas, Nevada ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Las Vegas mail.
Address basics
How to Write a Louisiana Address (With Examples)
Learn the correct Louisiana address format with real LA examples, apartment and PO Box formats and common mistakes to avoid.
City guides
Bear, DE ZIP Codes, Area Codes and Address Format
Bear, Delaware ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Bear mail.
Phone numbers
Colorado Area Codes: Complete List With Cities Served
Every Colorado area code with the main cities it serves, phone number formatting tips and safe test numbers for CO.
City guides
Alburgh, VT ZIP Codes, Area Codes and Address Format
Alburgh, Vermont ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Alburgh mail.
ZIP codes
Alaska ZIP Codes: Ranges, Prefixes and Major Cities
All about Alaska ZIP codes: the 99501–99950 range, three-digit prefixes, code types and ZIP codes for major AK cities.
City guides
Madison, WI ZIP Codes, Area Codes and Address Format
Madison, Wisconsin ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Madison mail.
ZIP codes
Florida ZIP Codes: Ranges, Prefixes and Major Cities
All about Florida ZIP codes: the 32003–34997 range, three-digit prefixes, code types and ZIP codes for major FL cities.
Address basics
How to Write a Arizona Address (With Examples)
Learn the correct Arizona address format with real AZ examples, apartment and PO Box formats and common mistakes to avoid.
City guides
Duluth, MN ZIP Codes, Area Codes and Address Format
Duluth, Minnesota ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Duluth mail.
City guides
Chicago, IL ZIP Codes, Area Codes and Address Format
Chicago, Illinois ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Chicago mail.
Phone numbers
New Hampshire Area Codes: Complete List With Cities Served
Every New Hampshire area code with the main cities it serves, phone number formatting tips and safe test numbers for NH.
City guides
Fargo, ND ZIP Codes, Area Codes and Address Format
Fargo, North Dakota ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Fargo mail.
City guides
Anderson, SC ZIP Codes, Area Codes and Address Format
Anderson, South Carolina ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Anderson mail.
Address basics
How to Write a Delaware Address (With Examples)
Learn the correct Delaware address format with real DE examples, apartment and PO Box formats and common mistakes to avoid.
City guides
Columbia, SC ZIP Codes, Area Codes and Address Format
Columbia, South Carolina ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Columbia mail.
City guides
Charleston, WV ZIP Codes, Area Codes and Address Format
Charleston, West Virginia ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Charleston mail.
ZIP codes
North Dakota ZIP Codes: Ranges, Prefixes and Major Cities
All about North Dakota ZIP codes: the 58001–58856 range, three-digit prefixes, code types and ZIP codes for major ND cities.
Address basics
How to Write a California Address (With Examples)
Learn the correct California address format with real CA examples, apartment and PO Box formats and common mistakes to avoid.
City guides
Waterbury, CT ZIP Codes, Area Codes and Address Format
Waterbury, Connecticut ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Waterbury mail.
City guides
Houston, TX ZIP Codes, Area Codes and Address Format
Houston, Texas ZIP codes, area codes, county and time zone, plus sample addresses and formatting tips for Houston mail.
Phone numbers
District of Columbia Area Codes: Complete List With Cities Served
Every District of Columbia area code with the main cities it serves, phone number formatting tips and safe test numbers for DC.