In 1980 the New Orleans City Planning Commission, for planning and decision-making purposes, divided the city into Census Tract based 'neighborhoods'. Additional neighborhoods were created after the 1990 and 2000 Censuses. Following Hurricane Katrina the Greater New Orleans Community Data Center (GNOCDC) settled on these boundaries to facilitate the use of local data in decision-making. These neighborhoods underwent further change during the 2010 Census due to modifications (consolidation and/or splitting) of Census Tracts. The resulting boundaries were renamed as 'Neighborhood Statistical Areas' to reflect their actual function. Census Tracts are small, relatively permanent statistical subdivisions of a county or statistically equivalent entity delineated by local participants as part of the U.S. Census Bureau's Participant Statistical Areas Program. The primary purpose of Census Tracts is to provide a stable set of geographic units for the presentation of decennial census data.

IP Code Tabulation Areas (ZCTAs) within the City of New Orleans are approximate area representations of U.S. Postal Service (USPS) ZIP Code service areas that the Census Bureau creates for tabulating summary statistics from census data. This entity was developed to overcome the difficulties in precisely defining the land area covered by each ZIP Code. Data users should not use ZCTAs to identify the official USPS ZIP Code for mail delivery.

Census data (block, block group, tract) for New Orleans, compiled by the New Orleans Regional Planning Commission.Scroll down to red Census tab then click on New Orleans tab.

1990 City of New Orleans/Orleans Parish Census data by block group.

1990 City of New Orleans/Orleans Parish Census data by tract.

1990 City of New Orleans/Orleans Parish Census data by block.

1990 City of New Orleans/Orleans Parish Census data. ESRI shapefile format, GIS software required for viewing geometry (http://www.esri.com/software/arcgis/arcreader/). Tabular data (DBF), included as part of the shapefile, are viewable in Excel.