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High Population Areas (HPAs) are considered High Consequence Areas (HCAs) as defined in <\/SPAN><\/SPAN>49 CFR § 195.450. <\/SPAN><\/SPAN>The HPA data is derived from the U.S. Census Bureau\u2019s TIGER Urban Areas data layer, which is reproduced with every decennial census and downloaded from the Census website. Within the Urban Areas data layer, features defined as Urban Areas containing 50,000 or more people with a population density of at least 1,000 people per square mile were extracted to become the High Population Areas data layer. Urban Areas with population densities lower than 1,000 people per square mile were not included in the High Population Areas data layer. A separate Excel table includes the 2020 Census population and population density values for each HPA. Depending on the version, the metadata is included as an .XML file within the downloadable Esri Shapefile. <\/SPAN><\/P>

Shapefile available for public download from <\/SPAN><\/SPAN>www.npms.phmsa.dot.gov<\/SPAN><\/SPAN><\/A>.<\/SPAN><\/SPAN><\/P>

Version: 5 (Derived from 2020 Census Urban Areas) <\/SPAN><\/P>

Census Urban Areas (Source Data): The TIGER/Line Files are shapefiles and related database files (.dbf) that 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 File 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.\" Each urban area is identified by a 5-character numeric census code that may contain leading zeroes. <\/SPAN><\/P>

In order for others to use the information in the Census MAF/TIGER database in a geographic information system (GIS) or for other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line Shapefiles.<\/SPAN><\/SPAN><\/P>

HCAs are defined in 49 CFR § 195.450. This dataset is one resource available to assist operators with identifying locations that meet the regulatory definition of an HCA. If a location meets the regulatory definition of an HCA but it is not mapped in the HCA data currently available from PHMSA, that location is still an HCA. Operators must continually assess the locations in which their lines are located, to include reference to NPMS as one avenue to obtain data but not the sole avenue, to determine if they are in or could affect an HCA.<\/SPAN><\/SPAN><\/P>

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