Surprisingly 5-digit United States ZIP Codes can and do cross county, state, and time zone boundaries. Even more interesting is that the preferred city name for a ZIP Code can vary at the 9-digit ZIP Code level.
The United States ZIP Plus 4 Multi-County ZIP Code Database provides an efficient platform to accurately identify the preferred city name, county, or time zone for any 9-digit ZIP Code.
This database provides a lossless compression of the preferred city name, county and Plus 4 add-on range information from the 43 million+/- records of the United States Postal Service ZIP + 4 national database, appends time zone identification to each ZIP+4 range, resulting in a manageable 406K +/- record count.
While this data finds use in many type applications, it is particularly well suited for TCPA and similar compliancy type applications needing to identify the county and time zone for any 9-digit ZIP Code.
Produced: on or before 5th calendar day quarterly
Current Release: December 3, 2024
Distribution Frequency: quarterly (issue date: January, April, July, October)
Distribution Format: Internet download
Multi-County ZIP Code Database Reference Manual
Multi-County ZIP Code Database Sample Data
Portions of data provided by and Copyright United States Postal Service 2023. Quentin Sager Consulting is a non-exclusive licensee of the United States Postal Service.
ZIP Code Assignments File
| Field | Data Type | Field Description |
|---|---|---|
| zip | CHAR (5) | ZIP Code The 5-digit code that identifies a specific geographic delivery area. ZIP Codes can represent an area within a state, or a single building or company that has a very high mail volume. |
| plus4_lo | CHAR (4) | +4 Low Number The beginning 4-digit ZIP Plus 4 number for the current "Plus 4" range. |
| plus4_hi | CHAR (4) | +4 High Number The ending 4-digit ZIP Plus 4 number for the current "Plus 4" range. |
| zip_type | CHAR (1) | ZIP Classification Code Identifies the type of ZIP area a 5-digit ZIP Code serves.
|
| city | VARCHAR (128) | Preferred Last-Line City State Name The USPS preferred last line city, municipality or Post Office name for a ZIP Code. |
| state | CHAR (2) | State Abbreviation The USPS 2-character abbreviation for the name of the state, U.S. territory, or armed forces ZIP Code designation. |
| fips | CHAR (5) | FIPS County Code The Federal Information Processing Series (FIPS) county code is a unique 5-digit code used to identify every county or equivalent area. This code is technically the concatenation of the FIPS 2-digit state code followed by the FIPS 3-digit county code. |
| utc | CHAR (6) | Time Zone Offset Standard time Coordinated Universal Time (UTC) offset for the geographic delivery area identified by the ZIP Code. Formatted +/-HH:MM |
| dst | CHAR (1) | Daylight Saving Time Single Y/N value indicating whether Daylight Saving Time (DST) is observed at the geographic area identified by the ZIP Code. |
| olson | VARCHAR (128) | Olson Time Zone ID Unique time zone name from the Internet Assigned Numbers Authority (IANA) time zone database. This database is also known as the tz database, tzdata, and Olson database. |
County Codes File
| Field | Data Type | Field Description |
|---|---|---|
| fips | CHAR (5) | FIPS County Code The Federal Information Processing Series (FIPS) county code is a unique 5-digit code used to identify every county or equivalent area. This code is technically the concatenation of the FIPS 2-digit state code followed by the FIPS 3-digit county code. |
| county | VARCHAR (128) | County Name The common name of the , parish, borough or equivalent area. |
| state | CHAR (2) | State Abbreviation The USPS 2-character abbreviation for the name of the state, U.S. territory, or armed forces ZIP Code designation. |
State Codes File
| Field | Data Type | Field Description |
|---|---|---|
| State_Abbr | CHAR (2) | State Abbreviation USPS 2-character state, territory or equivalent abbreviation. |
| State_FIPS | CHAR (2) | State FIPS Code Unique 2-digit Federal Information Processing Series (FIPS) state code. |
| State_Name | VARCHAR (128) | State Name The common state, territory or equivalent name |
| State_Formal | VARCHAR (128) | State Formal Name The formal state, territory or equivalent name. |
SQL Table Definitions
CREATE DATABASE IF NOT EXISTS `zipcode`;
USE `zipcode`;
DROP TABLE IF EXISTS `zipcode`;
CREATE TABLE `zipcode` (
`zip` char(5) NOT NULL,
`plus4_lo` char(4) NOT NULL,
`plus4_hi` char(4) NOT NULL,
`zip_type` char(1) DEFAULT NULL,
`city` varchar(128) NOT NULL,
`state` char(2) NOT NULL,
`fips` char(5) DEFAULT NULL,
`utc` char(6) DEFAULT NULL,
`dst` char(1) DEFAULT NULL,
`olson` varchar(128) DEFAULT NULL,
PRIMARY KEY (`zip`,`plus4_lo`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `county`;
CREATE TABLE `county` (
`fips` char(5) NOT NULL,
`county` varchar(128) NOT NULL,
`state` char(2) NOT NULL,
PRIMARY KEY (`fips`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `state`;
CREATE TABLE `state` (
`State_Abbr` char(2) NOT NULL,
`State_FIPS` char(2) NOT NULL,
`State_Name` varchar(128) NOT NULL,
`State_Formal` varchar(128) NOT NULL,
PRIMARY KEY (`State_Abbr`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;