ZIP+4 Address Database

9 digit zip 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 same 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 Specs & Features section at right and feel free to download a sample.

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

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Database Specs & Features

Download Sample Data (CSV)

  • FTP Download

    Due to file size, an FTP directory will be provided and updated as new releases occur for the duration of the annual subscription.

  • Quarterly Updates

    A monthly update of this database is not necessary, so we update our database quarterly and recommend that you download quarterly as well.

  • Free FTP/SFTP (upon request)

    To update your database without human intervention, we can provide an FTP address for you to write a script to access. Just request it after purchase.

  • Data Format - CSV

    Comma-Separated Values (CSV) Text File


  • 5-digit Zip Code

    Official U.S. Postal Service five digit ZIP Code (Note: some ZIP Codes begin with zero)

  • ZIP+4 Low Range

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

  • ZIP+4 High Range

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

  • Record Type Code

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

  • Street Pre-Direction

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

  • Street Name

    Name of Street(28 characters)

  • Street Suffix

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

  • Street Post-Direction

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

  • Address Low Range

    May contain numbers and/or letters (10 characters)

  • Address High Range

    May contain numbers and/or letters (10 characters)

  • Address Odd/Even

    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.

  • Bldg. Firm Name

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

  • Address 2nd Abbr

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

  • Address 2nd Low Range

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

  • Address 2nd High Range

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

  • Address 2nd Odd/Even

    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.

  • B/A Code

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

  • LACS Status

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

  • Gov Bldg Indicator

    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)

  • City/State Key

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

  • City

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

  • City Abbr

    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)

  • Pref. City/State Key

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

  • Pref. City

    Preferred City (28 characters)

  • City Delivery Flag

    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)

  • Mailing Name Flag

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

  • State Abbr.

    State Abbreviation (2 characters)

  • County

    County name (25 characters)

  • County FIPS

    County FIPS Code (3 digits)

  • Congressional District

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

  • Pref. City/State Key

    Preferred City State Key (6 characters)

  • Facility Code

    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 Classification

    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)

  • Unique Name Flag

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

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