ZIP+4 Address Database

9 Digit ZIP Code Address Database

GreatData’s ZIP+4 Address Database is comparable to the U.S. Postal Service (USPS) ZIP+4 Database. To minimize the download size, it is available in a comma-delimited file (CSV). The size of the download file is around 500MB zipped up and will extract to approximately 4GB. The database contains about 46 million records which includes most of the fields found in the U.S. Postal Service’s ZIP+4 database product. We excluded some fields that are used internally by the US Postal Service but are rarely used by other businesses.

See a list of fields in the Database Specifications below. Feel free to try the sample download at right.

We are a licensed distributor of U.S. Postal Service (USPS) and Canada PostOM Postal and ZIP Code databases.

Annual Subscription

30-Day Money-Back Guarantee


Highly Accurate

We earnestly pursue creating the highest quality databases.

Annual Subscription

Download updates all year long with an annual subscription.

Quarterly Updates

This product is updated regularly based on its frequency of change.

Download Options

Web download, SFTP access, a custom file utility for many products

Address List - ZIP+4

This data is well suited for any number of applications including in-house address verification programs. Included with the ZIP+4 database download is a city/state master file to provide valuable cross-reference information. It's normalization reduces the overall download size.

Learn more: View the Product Documentation / Watch our Accuracy Matters video

Database Specs

This is the starting range for the ZIP+4 code. (4 digits)

This is the ending range for the ZIP+4 code. (4 digits)

Single character code: F=Firm (business), G=General Delivery, H=High-rise, P=PO Box, R=Rural Route / Highway contract, S=Street

Abbreviation (2 characters). ‘N’, ‘SE’, etc.

Name of Street(28 characters)

Examples: ST, AVE, RD, BLVD, etc. (4 characters)

Abbreviation (2 characters). ‘N’, ‘SE’, etc.

May contain numbers and/or letters (10 characters)

May contain numbers and/or letters (10 characters)

Odd/Even/Both code (O,E,B - 1 character). This is used with the Low / High address ranges. For instance: this ZIP+4 pertains to addresses from 100 – 400 Main ST, Even numbers.

Building / Firm Name. For example: Empire State Building. (40 characters)

Secondary info only applies to record types F & H). Typically will have ‘UNIT, APT, STE.’ (4 characters)

This is alphanumeric and may be a suite number or apartment, such as ‘3B.’ (10 characters)

This is alphanumeric and may be a suite number or apartment, such as ‘3B.’ (10 characters)

Odd/Even/Both code (O,E,B - 1 character). This is used with the Low / High 2nd address ranges, for instance: this ZIP+4 pertains to addresses from 100 – 400 Main ST, Even numbers.

Base vs. Alternate Code - B,A (1 character)

LACS Status Indicator Code: L=LACS Converted, blank=Not Applicable (1 character)

Government Building Indicator:A=City, B=Federal, C=State, D=Firm Only, E=City and Firm Only, F=Federal and Firm Only, G=State and Firm Only (1 character)

Usually this is a letter, followed by 5 digits, but sometimes is just a 4 or 5-digit number (6 characters)

This corresponds to the City/State Key. Sometimes it will be the same as the Preferred City, but not often (28 characters)

Abbreviated City. For cities that are over 13 characters long, this will be the city name abbreviated to no more than 13 characters. Some legacy systems need this. (13 characters)

Preferred City/State Key. Similar to the City/State key, but for the preferred city. (6 characters)

Preferred City (28 characters)

Y=The USPS delivers in the city, N=USPS does not deliver in the city. Occurs in rural areas, Unique ZIPs, Post Office ZIPs (1 character)

If the city name can be used for mailing, it will be a ‘Y’, otherwise an ‘N’ (1 character)

State Abbreviation (2 characters)

County name (25 characters)

County FIPS Code (3 digits)

Congressional District Code - Note: At Large = 'AL' (2 characters)

Preferred City State Key (6 characters)

B=Post Office Branch, C=Community Post Office, N=Non-Postal Community Name, P=Post Office, S=Station, U=Urbanization-used only in Puerto Rico (1 character)

ZIP Code Classification Code - This code will repeat for all occurrences of this ZIP: M=Military APO/FPO/DPO, P=Exclusively used for PO Boxes, U=Unique (Organizations that have high mail volume can receive their own unique ZIP Code), Blank=General Delivery ZIP Code (1 character)

If ZIP Code is unique and the ‘city’ name is the organization name, this will be ‘Y’, otherwise ‘N’ (1 character)

Database Sources

We are licensees of USPS database products. We use multiple sources and our own internal algorithms based on decades of experience to provide you with the most accurate product available.

Affordability and Simplicity

  • Cost Effective
  • One Year Access
  • Updated Quarterly
  • Unlimited Downloads
  • Unlimited User Licensing Available
  • Supplemented with demographic and marketing data
  • We are a U.S Company - Live, Free Technical Support
  • Money Back Guarantee


Cannot be resold, transferred, or used to compete with (as outlined in our license agreement).

Related Links

ZIP Code Database with Latitude and Longitude
ZIP Code Database without Latitude and Longitude