The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation.
Block Groups (BGs) are clusters of blocks within the same census tract. Each census tract contains at least one BG, and BGs are uniquely numbered within census tracts. BGs have a valid code range of 0 through 9. BGs have the same first digit of their 4-digit census block number from the same decennial census. For example, tabulation blocks numbered 3001, 3002, 3003,.., 3999 within census tract 1210.02 are also within BG 3 within that census tract. BGs coded 0 are intended to only include water area, no land area, and they are generally in territorial seas, coastal water, and Great Lakes water areas. Block groups generally contain between 600 and 3,000 people. A BG usually covers a contiguous area but never crosses county or census tract boundaries. They may, however, cross the boundaries of other geographic entities like county subdivisions, places, urban areas, voting districts, congressional districts, and American Indian / Alaska Native / Native Hawaiian areas.
The BG boundaries in this release were delineated as part of the Census Bureau's Participant Statistical Areas Program (PSAP) for the 2020 Census.
This resource is a member of a series. The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. After each decennial census, the Census Bureau delineates urban areas that represent densely developed territory, encompassing residential, commercial, and other nonresidential urban land uses. In general, this territory consists of areas of high population density and urban land use resulting in a representation of the urban footprint. There are 2,646 Urban Areas (UAs) in this data release with either a minimum population of 5,000 or a housing unit count of 2,000 units. Each urban area is identified by a 5-character numeric census code that may contain leading zeroes.
The Delaware Department of Safety and Homeland Security (DSHS) is the official custodian of Delaware crash reports and is responsible for statewide crash data collection and dissemination. A crash report is a summary of information collected about a collision and is filled out by a Delaware law enforcement officer who is investigating the crash. The data contained on FirstMap and the Open Data Portal represents the best available information at DSHS and is not an official record of what transpired in a particular crash or for a particular crash type and does not contain personal information. This data is generated from crash reports and allows any member of the public to engage in interactive analysis and data exploration for the purpose of identifying, evaluating or planning the safety enhancement of potential crash sites, hazardous roadway conditions, or railway-highway crossings. This data is updated monthly and contains crashes that occurred since 2009 through six months ago. Official crash reports are confidential and are not a public record under the Delaware Freedom of Information Act. Authorized parties may contact the reporting police agency directly for official copies of crash reports (21 Del. C. §313).
DSHS is committed to bringing public awareness to crash information. The Office of Highway Safety’s annual reports (https://ohs.delaware.gov/reports.shtml), the Office of Highway Safety’s annual safety plan (https://ohs.delaware.gov/reports.shtml), and the Delaware State Police Traffic Statistical Reports (https://dsp.delaware.gov/reports/) also contain a variety of information and data. In addition, the State of Delaware’s Strategic Highway Safety Plan is available at https://deldot.gov/Programs/DSHSP/index.shtml and is updated every five years.
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