National Wetlands Inventory

National Spatial Data Infrastructure (NSDI) Wetlands Layer:

Visit the Wetlands Layer index page for more information.

Contact Information:

You can also email the FWS Customer Service Center, or call 1.800.344.WILD (1.800.344.9453).

Wetland Classification Codes

The wetland classification codes are a series of letter and number codes that have been developed to adapt the national wetland classification system to map form. These alpha-numeric codes correspond to the classification nomenclature that best describes the habitat. (for example, PFO1A)

The Wetland Code Interpreter is a tool that will instantly provide the detailed habitat descriptions for an area represented by the wetland classification code. Enter a wetland area's code into the interpreter and obtain the classification of that wetland area as defined in Cowardin et al (1979).

Click here to open the Wetland Code Interpreter (pop-up window)

Important Documents

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