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  2. List of ecoregions in the United States (EPA) - Wikipedia

    en.wikipedia.org/wiki/List_of_ecoregions_in_the...

    The Commission's 1997 report, Ecological Regions of North America, provides a framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems. [1] In the United States, the EPA and the United ...

  3. List of regions of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_regions_of_the...

    U.S. Census Bureau regions and divisions. Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. [1] [2] The Census Bureau region definition is "widely used... for data collection and analysis", [3] and is the most commonly used classification system.

  4. File:Map of Southern Plains US ecoregion, Level IV ecoregions ...

    en.wikipedia.org/wiki/File:Map_of_Southern...

    This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You ...

  5. List of core-based statistical areas - Wikipedia

    en.wikipedia.org/wiki/List_of_core-based...

    The United States Office of Management and Budget (OMB) has defined 925 core-based statistical areas (CBSAs) for the United States and 10 for Puerto Rico. [1] The OMB defines a core-based statistical area as one or more adjacent counties or county equivalents that have at least one urban core area of at least 10,000 population, plus adjacent territory that has a high degree of social and ...

  6. Metropolitan statistical area - Wikipedia

    en.wikipedia.org/wiki/Metropolitan_statistical_area

    The MSA population as of July 1, 2023, as estimated by the United States Census Bureau [15] The MSA population as of April 1, 2020, as enumerated by the 2020 United States census [15] [a] The percent MSA population change from April 1, 2020, to July 1, 2023 [15] The combined statistical area (CSA) [16] if it is designated and the MSA is a ...

  7. List of largest cities of U.S. states and territories by ...

    en.wikipedia.org/wiki/List_of_largest_cities_of...

    This is a list of the five most populous incorporated places and the capital city in all 50 U.S. states, the District of Columbia, and the 5 inhabited territories of the United States, as of July 1, 2023, as estimated by the United States Census Bureau. [1]

  8. New EPA rule says 218 US chemical plants must reduce ... - AOL

    www.aol.com/news/epa-rule-says-200-us-130057398.html

    The new rule will slash more than 6,200 tons (5,624 metric tonnes) of toxic air pollutants annually and implement fenceline monitoring, the EPA said, addressing health risks in surrounding ...

  9. List of U.S. states and territories by population - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._states_and...

    Division totals – 9 divisions for 50 states and District of Columbia Region totals – 4 regions (2 or 3 divisions each) Individual territories Total U.S. territories 50 states + District of Columbia Divisions & regions as defined by U.S. Census Bureau Last col. shows larger region which contains entity in col. 1