Information Resources and Technology Management


You are invited to read the definitions of terms used in this data standard.

Real Property Number
A unique consecutive number, up to a maximum of eight digits, assigned by a unit manager to each building, structure, or facility owned or leased by the Service, or over which it has primary jurisdiction, in each State where the unit is located. "Unit" means any existing research area or administrative site, and all components of the National Wildlife Refuge System and the National Fish Hatchery System within a State. "Leases" refer to those buildings, structures, or other facilities rented directly by the Service and do not include General Services Administration (GSA) leases. Whenever the Service obtains fee or non-GSA lease interest,  the unit is assigned an Interior-Fish and Wildlife Service (IFWS) Number by the Washington Office Division of Realty.  The Real Property Number constitutes a unique Service-wide code in the Real Property Inventory (RPI).  The Real Property Number is permanent and cannot be re-assigned to another property, even if the original building, structure, or facility is disposed of or destroyed. 
NNNNNNNN, where each N represents a number from 0 through 9.
Recommended Field Name LOCATION.LOCATION
The official values to be used for this data element will be described in the Refuge Management Information System (RMIS) under Real Property Inventory. 
An electronic file of the values to be used for this data element is not available at the present time.
Historical Data For information on past versions of this standard, contact the Chief Data Officer

Part 270, FW 6, Data Management and Standards, has been superceded by Part 274, FW 2, Establishing Service Data Standards.

Use Instructions
As of the approval date, this data element will be used in any new automated system, data set, database, or information application, including new Geographic Information System (GIS) data and applications. This data element will also be used in any major modifications to existing systems or versions of these data-related items that use real property numbers assigned by a unit manager to buildings and other structures and facilities (i.e., office, shop, visitor center, residence, road, foot trail, water control structure, bridge, and fence) owned or leased by the Service, or over which it has primary jurisdiction, in each State where the unit is located.

Service staff are strongly encouraged to utilize this data element in existing systems, data sets, databases, and information applications. Where existing systems and data-related items are not in compliance, they should be modified to achieve compatibility and implement this data standard.

When a unit is located in one state, the same consecutive numbering system is continued throughout the unit. When a refuge is located in more than one state, each state portion is treated as a separate unit with its own set of consecutive property numbers. In the small wetlands program (i.e., waterfowl production area counties), each county is considered a separate unit and may have its own set of consecutive property numbers. Alpha characters cannot be used, and numbers cannot be duplicated within a single unit.

Approval Date
November 13, 2000
Validation Date
September 13, 2013
Data Steward
Pending Assignment
Point of Contact John K Dyer, Information Systems Specialist, Office of Information and Technology Management.


Last updated: May 9, 2019