Refer to Historical Data for the names of the Members of the House of Representatives of the United States, state alpha codes, state numeric codes, congressional district numeric codes, and party affiliations for the 107th Congress. A source for an electronic copy of Member names and congressional district numeric codes for the previous 101st through 106th Congress is not currently available. 

Lists and outline maps that identify the composition and boundaries of each congressional district are included in (1) a Department of Commerce/Bureau of the Census publication entitled "Congressional District Atlas", and (2) the "Congressional Directory" published for each Congress. Both documents are available from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C., 20402.

Previous versions of the data standard and ASCII (.txt) files of earlier revisions to the official list of Members of the House of Representatives of the United States, state alpha codes, state numeric codes, congressional district numeric codes, and party affiliations for the 108th Congress are available here:   Revision 1

Previous versions of the data standard and ASCII (.txt) files of the official list of Members of the House of Representatives of the United States, state alpha codes, state numeric codes, congressional district numeric codes, and party affiliations for the 107th Congress are available here:   Revision 1     Revision 2

The initial data standard and source data is available here:  Congressional District

Part 270, FW 6, Data Management and Standards, dated September 30, 2002.

Federal Information Processing Standards Publication 9-1, "Congressional Districts of the United States" dated November 30, 1990.

Visit http://thomas.loc.gov  for the House and Senate Directories of the 108th Congress. This site provides member lists and committee information for the108th Congress, as well as the previous 101st through 107th Congresses. Member lists include an alphabetical list of members with State and District information and a list of members by State.

To ensure compliance with the Service Information and Technology Architecture (SITA), 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.

Two-digit numeric codes are used to represent the congressional districts of each multi-district State (e.g., the First Congressional District is identified as "01", the Second Congressional District is identified as "02", etc.). For a State whose representative is designated "at large", the Congressional District is designated as "00". For an entity with a nonvoting delegate, such as the District of Columbia, the representational area is designated as "98". For entities with no representation in the Congress, such as the Northern Mariana Islands, the area is designated as "99". 

Congressional district codes are unique within each State and equivalent entity, and for each Congress; however, congressional districts in different states can have the same code (e.g., the First Congressional District of Alabama and Arizona are both coded "01"). Therefore, in data systems concerned with the identification of districts in more than one State, the congressional code must be preceded by the two-digit State numeric code, as prescribed by the Federal Information Processing Standards Publication 5-2, 1987 May 28, "Codes for the Identification of the States, the District of Columbia and the Outlying Areas of the United States, and Associated Areas." For example, the numeric code for the First Congressional District of Alabama is 0101, while the numeric code for the First Congressional District of Arizona is 0401. Data systems concerned with only one State may use only the single congressional district code. All single-digit congressional districts must have a leading zero. 

When automated systems use the congressional districts of more than one State and more than one Congress, the four-digit State and congressional district codes will be followed by a three-digit code to identify the number of the Congress. For example, the seven-digit numeric code for the First Congressional District of Arizona for the 95^th Congress is 0401095, while the code for the 101^st Congress is 0401101. When single and/or two-digit codes representing the number of the Congress are used in conjunction with the four-digit State and congressional district codes, leading zeros are required.

The Service data standard for State Numeric Code can be viewed at this site. It references the unique two-digit FIPS numeric codes for representing the 50 States, the District of Columbia and the outlying areas of the United States, and associated areas. It also provides electronic copies of these values for download in ASCII (.txt) and Access (.mdb) formats.

Congressional district and State numeric codes will be handled as separate data fields in any new or modified automated system, and will not be combined in a single data field.

A related Service data standard for the Congressional District Data Layer can also be viewed at this site. It references the spatial component of the congressional district information, using the same coding scheme as this data element. The various data layers for the 103rd through 108th Congresses can be downloaded from the Census Bureau as geographic information system (GIS) coverages and contain an electronic version of all the congressional district codes.