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The physiographic regions of the contiguous United States comprise 8 divisions, 25 provinces, and 85 sections. [1] The system dates to Nevin Fenneman's report Physiographic Divisions of the United States, published in 1916. [2] [3] The map was updated and republished by the Association of American Geographers in 1928. [4]
The 100 county equivalents in the U.S. territories are not on this map. There are 3,244 counties and county equivalents in the United States. [1] [2] [a] The 50 states of the United States are divided into 3,007 political subdivisions of states called counties. [3]
This 1988 BLM map depicts the principal meridians and baselines used for surveying states (colored) in the Public Land Survey System. The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling.
Many states use township as a governmental level between county and municipality. Most states have counties with unincorporated areas (no municipal government). Municipal governments are called cities, towns, villages, boroughs, and townships, and can form 1-3 layers of government.
ISO 3166-2:US is the entry for the United States in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.
The territory of the United States may be divided into three classes of non-overlapping top-level political divisions: the 50 States, the federal district, District of Columbia, and a variety of insular areas. There are other political divisions overlapping with or subordinate to the above, for example: counties.
This is a list of urban areas in the United States as defined by the United States Census Bureau, ordered according to their 2020 census populations. An urban area is defined by the Census Bureau as a contiguous set of census blocks that are "densely developed residential, commercial, and other nonresidential areas".
The United States is composed of states, possessions, territories, and a federal district, each with varying numbers of subdivisions. The principal administrative division of a country is sometimes called the " first-level (or first-order ) administrative division" or "first administrative level".