A large amount of reference data is used to draw political districts.
This data can be divided into two main groups: numeric and geographic.
The numeric component includes items such as population and voter registration values.
The geographic component includes features such as roads, rivers, and political boundaries that can be graphically displayed as features on a map.
The numeric data matches up with the geographic data at several different levels.
The main levels of interest in district drawing are counties, voting tabulation
districts (VTDs), and census blocks.
These three main levels have a nesting relationship.
In other words, counties are comprised of VTDs that, in turn, are comprised of census blocks.
Each level covers the entire territory of the state, such that there is no point within the state's boundaries that cannot be assigned to each of the three levels.
All information on this page corresponds with the redistricting database compiled by the General Assembly in March of 2011.
The data processing notes explain technical details of integrating the different datasets.
See the bottom of this page for information on file formats.
*Voter Registration and Election reports are not provided at the municipal level because the underlying data comes to us by Voting Tabulation District (VTD) geography, which has no inherent relationship with municipal geography.
There are three main types of numeric data in our system:
Complete numeric datasets, as processed for use in the General Assembly's redistricting system, are linked below for download.
The field layout definition is required to interpret the field headings.
See the data processing notes document for technical details.
The "block level keys" table is useful for establishing relationships between the different geographic levels.
The numeric data is also appended to each of the corresponding geographic layers, available for download in the following section.
Note that the General Assembly's redistricting system is census block-based.
All data items therefore have to reconcile to that lowest level of geography.
Although registration and elections data are available at all geographic levels, they are most reliable at the VTD and county levels since the original data was VTD-based.
The geographic data in the General Assembly's redistricting system is based on the 2010 TIGER/Line Shapefiles provided by the US Census Bureau.
Below are links to various statewide layers derived from that dataset.
These files are intended for use with Geographic Information System (GIS) software.
Layers are projected in NC State Plane, NAD83, meters.
ACCDB - Access Database.
This is a database format used by Microsoft Access, starting with Access 2007.
GDB - File Geodatabase.
This is a spatial data format created by ESRI.
File geodatabases contain geographic layers and are used with geographic information system (GIS) software.
Each geodatabase is comprised of a directory with a ".gdb" extension containing a large number of individual files.
ESRI offers a freely downloadable application called ArcGIS Explorer Desktop that can be used to view layers in file geodatabases.
PDF - Portable Document Format, created by Adobe.
These files can be viewed with Adobe's freely distributed Acrobat Reader.
With a PDF file, a person can zoom and pan over what is essentially a digital version of a paper document.
The format also works well for printing.
TAB - Tab-delimited text file.
This is a simple text format consisting of values separated by tabs.
It is easily imported into spreadsheet and database programs.
Each line of the file corresponds to a table row and each item in a line corresponds to a table column.
The first line contains column headings.
It can also be viewed with text editor programs such as NotePad or WordPad, provided the file size isn't too large.
XLSX - Microsoft Excel worksheet.
Excel is a very commonly used spreadsheet program.
A free Excel Viewer is available from Microsoft.
ZIP - Due to large size, some of the files linked from this site have been compressed or "zipped".
In addition to native support in some operating systems, a variety of commercial and open source programs exist that can extract ".zip" files.