USPS ZIP+4 (Full ZIP9)

Geocodio can return USPS ZIP+4 codes along with some deliverability indicators for addresses and latitude/longitude coordinates, including PO Boxes.

You can download an example of the results when you add ZIP+4 to a spreadsheet of addresses here or latitude/longitude coordinates here.

If you'd prefer to use an API, you can see our technical documentation here.

Data returned for ZIP+4 data appends

ZIP+4 and ZIP 9

• ZIP+4 Range Start
• ZIP+4 Range End (or blank if no range)
• ZIP 9 Range Start
• ZIP 9 Range End (or blank if no range)

The range of ZIP Codes that are associated with this result as represented by the minimum and maximum number.

The ZIP9 code consists of the ZIP5 code, a dash, and the +4 code.

In most cases a single ZIP+4/ZIP 9 code is associated with a location, so the second column is left blank. Some larger businesses may however have multiple ZIP+4 codes assigned to a single address.

If a second address line (i.e. apartment/unit number) is applicable for the given building, it is also required to determine the correct ZIP+4 code.

Record Type

• Record Type Code
• Record Type Description

The type of ZIP+4 result. Possible values are:

• F: Firm
• G: General Delivery
• H: High-rise
• P: PO Box
• R: Rural Route/Contract
• S: Street

Residential Delivery Indicator (RDI)

This determines whether an address is Commercial or Residential. The value may also be blank if there are no records that indicate the residential status of this property.

Here's an example of what the residential indicator value looks like in a spreadsheet:

Carrier Route ID

• Carrier Route ID
• Carrier Route Description

A 4-byte code that determines the type of postal route that that servers the address. Possible values are:

• Bxxx: PO Box
• Hxxx: Contract
• Rxxx: Rural Route
• Cxxx: City Delivery
• Gxxx: General Delivery

Building or Firm Name

• Building or Firm Name

A USPS-provided name associated with the address. This is available for businesses that have registered their name with USPS and for most federal and state government buildings including schools and offices.

The building or firm name field takes the secondary address unit into account if available.

If no name is available, the value is blank.

Government Building

• Government Building Code
• Government Building Description

Type of government building (if applicable).

If no name is available, the value is blank.

• A: City Government Building
• B: Federal Government Building
• C: State Government Building

• D: Firm Only
• E: City Government Building and Firm Only
• F: Federal Government Building
• G: State Government Building and Firm Only

Facility Code

• Facility Code
• Facility Description

Facility code associated with the 5-digit ZIP Code

Possible values are:

• B: Branch
• C: Community post office (CPO)
• N: Non-postal community name, former USPS facility, or place name
• P: Post Office
• S: Station
• U: Urbanization

City Delivery Indicator

Indicates whether our not the local post office has a city delivery carrier route.

Valid Delivery Area

In some cases an address exists but it is not a valid delivery point for postal purposes. This could for example be because it is an undeveloped lot.

Exact Match

An exact match means that there was no ambiguity with the lookup and that the given ZIP+4 code is the correct and only match for the given address.

Most often, not-exact matches are due to lookups for an apartment or office building that is missing a unit/apartment number.

In these cases it is not possible to determine an accurate ZIP+4 code without supplying secondary address line information.