If you have 5-digit ZIP codes but not the ZIP+4s, you can find the correct district more than 90 percent of the time using only the 5-digit ZIP code. Click here for more information.

Please note that this database does NOT contain street address information. This database is useful for finding the district if you already have ZIP+4 data. If you have the street address (but NOT the ZIP+4) then you need to use an address matching product such as our Perfect Address product line to find the congressional district. Click here for more information.

Members of the 118th Congress
The Congressional District Database includes a "crosswalk" file containing contact information for each member or delegate of the 118th US Congress. This ASCII file lists the name, state, district, DC office address, telephone number, fax number, email form, and web site contact information for all 541 Members of Congress (435 members plus 6 non-voting delegates of the House and 100 members of the Senate).

The database also includes a file containing a list of all the states and territories, with the 2-digit state FIPS code assigned to each state by the US Government.

We update every record in Congressional District Database monthly, so you always receive the latest and most up-to-date data. You can't get more accurate and timely ZIP code data from any other source! We license our ZIP code data directly from the US Postal Service, and collect and cross-check all the other data continuously from a variety of sources.

Available Formats
The Congressional District Database is available in three formats:

• A full-format version with data for each state as separate file.
• A full-format version with data for all states in a single file.
• A concise-format version with data for all states in a single file.

The concise-format version lists ranges of active ZIP+4s, with about 2.5 million range records in a single ASCII file covering the entire country.

You may download any of these formats after you place your order.

Record Layout of the Full-format Files
Each record contains exactly eight comma-separated text fields, defined as follows:

Field		Type		Content
ZIP+4		9 digits		nnnnn-nnnn
City Name		Variable length ASCII		28 alphanumeric maximum
City Place FIPS		Fixed length ASCII		5 numeric characters
County Name		Variable length ASCII		25 alphanumeric maximum
County FIPS		Fixed length ASCII		3 numeric characters
State Code		Fixed length ASCII		2 alpha characters
State FIPS		Fixed length ASCII		2 numeric characters
Congressional District		Fixed length ASCII		2 digits

All fields are treated as text fields, but the fields are NOT quote delimited, to conserve file space. Fields do not contain embedded commas. For numeric fields, leading zeroes are retained in all cases. This prevents problems importing the data into database programs.

In each record, the fields contain data relating to the particular ZIP+4 identified by the ZIP+4 field.

The City name is the city in which the ZIP+4 lies, as defined by the USPS.

The city Place FIPS code comes from the Census Bureau Place FIPS file, which does not always agree with US Postal Service naming and spelling for a given place name. Where no matching city Place FIPS code can be determined, the city FIPS code is set to 00000.

The County FIPS code is a 3-digit numeric field containing a unique numeric code assigned to each county within a state by the US government.

The Congressional District field contains the numeric district number (with leading '0' if less than 10) within the state for that particular ZIP+4. A single ZIP+4 record normally applies to a single block of a street or sometimes to a single address of a street, which means that this database resolves the district correctly down to the block or address level. If a 5-digit ZIP code lies in multiple districts (more than 6000 5-digit ZIP codes lie in multiple districts) the ZIP+4 records provide the necessary resolution to find the correct district within the ZIP code. For states with only a single congressional district, the congressional district field contains 00.

Each record ends in an ASCII CR-LF pair.

Record Layout of the Concise-format File
The concise-format Congressional District Database database is a single ASCII file that contains only the ZIP code, state code, congressional district, and ZIP+4 range. This format does NOT include the city or county names, nor any FIPS codes.

Each record of the concise-format file contains exactly five CSV text fields, defined as follows:

Field		Type		Content
ZIP Code		Fixed length ASCII		5 numeric characters
State Code		Fixed length ASCII		2 alpha characters
Congressional District		Fixed length ASCII		2 numeric characters
Plus 4 Low		Fixed length ASCII		4 numeric characters
Plus 4 High		Fixed length ASCII		4 numeric characters

Each record ends in an ASCII CR-LF pair.

The Plus 4 Low and Plus 4 High range define a group of 1 to 9,999 active "+4s" that all belong to a single 5-digit ZIP code, all lie in a single congressional district, and all belong to a single state. All possible "+4s" that fall within the range are valid "+4s", as defined by the USPS.

Sample files:
Click here to download full-format sample records in comma-delimited ASCII (CSV) format.
Click here to download full-format sample records in comma-delimited ASCII (CSV) format, compressed with PKZip.
Click here to download concise-format sample records in comma-delimited ASCII (CSV) format.
Click here to download concise-format sample records in comma-delimited ASCII (CSV) format, compressed with PKZip.

Licenses:
We offer these licenses for the Congressional District Database:

• Workstation License - single-user, single workstation
• Enterprise License - unlimited users on unlimited sites within one company
• Duplication Addendum - Addendum to Enterprise or Workstation License for redistributing the data of the Congressional District Database outside your company.

Prices

	September 2024 data	Quarterly* Subscription save up to 62%	Monthly** Subscription save up to 68%
Workstation License:	$313.95	$523.95	$1,311.45
Enterprise License:	$418.95	$628.95	$1,573.95
Duplication Addendum: up to 100 copies unlimited copies	$838.95 $1,678.95	$1,258.95 $2,518.95	$3,148.95 $6,298.95

* Quarterly subscription: This is an annual fee. You'll receive the latest Congressional District database every three months for a full year, starting with September 2024.
** Monthly subscription: This is an annual fee. You'll receive the latest Congressional District database every month for a full year, starting with September 2024.
Prices subject to change without notice.

Delivery:

Internet:	Download this database immediately after placing your order online via our secure server. Approximate download file size (full-format): 62 MB. Approximate download file size (concise-format): 15 MB.

30-Day Money-Back Guarantee
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You will be able to select the database format you wish to download when you reach the Congressional District Database download page after you place your order.