How ZIP codes are distributed across the country

The first digit of a ZIP code identifies a broad region that runs roughly from the Northeast (0) to the West Coast and Pacific (9). Derived from the reference dataset, the states and territories that use each first digit are:

First digitStates and territories (by number of ZIP codes)
0New Jersey, Massachusetts, Maine, Connecticut, Military and other postal records, Vermont, New Hampshire, Puerto Rico, Rhode Island, U.S. Virgin Islands, New York
1Pennsylvania, New York, Delaware
2Virginia, North Carolina, West Virginia, Maryland, South Carolina, District of Columbia
3Florida, Georgia, Alabama, Tennessee, Mississippi, Military and other postal records
4Ohio, Michigan, Indiana, Kentucky
5Iowa, Minnesota, Wisconsin, North Dakota, Montana, South Dakota, District of Columbia
6Illinois, Missouri, Kansas, Nebraska
7Texas, Oklahoma, Louisiana, Arkansas, Missouri
8Colorado, Arizona, New Mexico, Utah, Idaho, Nevada, Wyoming, Texas
9California, Washington, Oregon, Alaska, Hawaii, Military and other postal records, Guam, Northern Mariana Islands, Marshall Islands, American Samoa

Read more in Three-digit ZIP prefixes and area codes and What is a ZIP code?.

City and county directories

Place-name directories exist for the most searched cities: Dallas, Atlanta, Los Angeles, Orlando, Miami, Nashville, Las Vegas, Seattle, Phoenix, Sacramento, Boston, San Diego, Austin, San Antonio, Tampa, Denver, San Francisco, Charlotte, Colorado Springs, Detroit, Philadelphia, Minneapolis, San Jose, Raleigh, Cincinnati, Fresno, Indianapolis, Pittsburgh, Honolulu, Milwaukee, Oklahoma City, Albuquerque, Boise, Tulsa, Cleveland, Memphis, Tucson, New Orleans, Salt Lake City, Fort Lauderdale, Baltimore, El Paso, Omaha, Chattanooga, Spokane, Reno, Des Moines, Long Beach, St. Louis, Columbus, Portland, Kansas City, Manhattan, Brooklyn, Chicago, Houston, New York City, Jacksonville, Tallahassee, Baton Rouge, King of Prussia, Indiana, Peru, Harrisburg, Springfield, Reading, Normal, Harrison, Sylvania, Louisburg, Orting, Coatesville, Hazleton, Dillsburg. Cross-state county directories: Franklin County, Putnam County, Orange County.