Information Resources and Technology Management

Data Element: IFWS NUMBER

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

Interior-Fish and Wildlife Service (IFWS) Number
A unique one- to six-character code assigned by the Washington Office, Division of Realty, to each organizational unit, area, or project site over which the Service has some type of jurisdiction. 
Character Field
C through CCCCCC, where each C represents a number from 0 through 9, a letter from A through Z, or a hyphen (-).
Recommended Field Name IFWS
The official values to be used for this data element are available in Excel format. This source file includes the official unit names and IFWS numbers assigned by the Washington Office, Division of Realty, for land units in the Land Records System (LRS) as of October 9, 2007.

For the most current data on the Service's official IFWS numbers, please contact Ken Fowler, Division of Realty, by electronic mail (Ken_Fowler@fws.gov) or phone (703-358-1876).

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Part 270, FW 6, Data Management and Standards, has been superceded by Part 274, FW 2, Establishing Service Data Standards.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 the six-digit alphanumeric codes assigned by the Washington Office, Division of Realty, to organizational units, areas, or project sites over which the Service has some type of jurisdiction. Each organizational unit, area, or project site should have a unique IFWS number; however, there are a few instances where the same IFWS number has been assigned to more than one unit.   Therefore, please contact the Data Steward identified in this standard prior to using duplicate IFWS numbers in any new or existing data files.    

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.

Whenever possible, the IFWS number should be used in conjunction with the official Organization Code and Organization Name

Approval Date
February 23, 2000
Validation Date January 21, 2011
Data Steward
Ken Fowler, Realty Specialist, Division of Realty.


Last updated: May 9, 2019