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United States of America Summary

Population 2000 (NSO-Based Estimate '000) 281,424   Population 2000 (UN '000) 283,230
Area (km2) 9,210,755   Avg. Input Resolution (km) 12
Number of Administrative Units 60,884   Population Per Administrative Unit ('000) 5
Number of Urban Extents 2,103   Number of Settlement Points 14,462

United States of America Details

Names
ISO3-Code USA
Continent North America
Country Name United States of America
Administrative Classifications
Level Used 3.0
Leve1 Type State
Level2 Type County
Level3 Type Tract
Level4 Type Block Group
Number of Units 60,884
Population Per Unit ('000) (2000, estimate) 5
National Population Estimates
Last Year of Reference 2000
NSO-Based Estimated Population, 1990 ('000) 248,595
NSO-Based Estimated Population, 1995 ('000) 262,444
NSO-Based Estimated Population, 2000 ('000) 281,424
UN Population, 1990 ('000) 254,776
UN Population, 1995 ('000) 268,744
UN Population, 2000 ('000) 283,230
National Spatial Estimates
Area (km2) 9,210,755
Average Input Resolution (km) 12
Settlement Points
Number of Settlement Points 14,462
Largest Settlement, by Population (2000, estimate) 8,008,278
Smallest Settlement, by Population (2000, estimate) 1,000
Mean Settlement, by Population (2000, estimate) 14,281
Urban Areal Extents
Number of Urban Extents 2,103
Largest Urban Extent (km2) 24,173
Smallest Urban Extent (km2) 2
Mean Urban Extent (km2) 378
Total for All Urban Extent (km2) 794,416
Largest Urban Extent (population, 2000) 26,991,208
Smallest Urban Extent (population, 2000) 1,090
Mean Urban Extent (population, 2000) 113,842
Total for All Urban Extent (population, 2000) 239,408,852
% Total Land Area in Urban Extents (km2) 9%
% Total Population in Urban Extents (2000, estimate) 85%
% Total Population that is Urban (2001, UN World Urbanization Prospects) 77%
Urban Areal Extents, by Source
Nighttime Lights Data 5,470
Regression-estimated Extents 306
Digital Chart of the World 10
Other 0
Notes
Administrative Population Source Data:
US Census Bureau, Census Tract Relationship Files, http://www.census.gov/geo/www/relate/rel_tract.html .
Administrative Boundary Source Data:
CIESIN archive of Census Related Products (ACRP);1990 census tract boundary files based on TIGER 1992 files containing U.S. census geographies, http://sedac.ciesin.org/plue/cenguide.html .
Settlement Point Population Source Data:
1990 US Census, http://www.census.gov/geo/www/gazetteer/gazette.html; 2000 US Census, http://www.census.gov/geo/www/gazetteer/gazette.html
Settlement Point Coordinate Source Data:
1990 US Census, 2000 US Census
Urban Criteria for Settlements (UN):
Places with 2,500 inhabitants or more and urbanized areas, that is, contiguous built-up territory around a larger city.
Administrative Population Edits and Notes:
? 1995 was interpolated by using growth rates based on 1990 and 2000 population values (census population counts for 1990 and 2000). Where values in 1990 or 2000 were zero, a proxy value of 1 was used to calculate the rates. ? 2005-2025 were estimated using growth rates based on US Census Bureau state-level population projections. Series ''A'' projections were used from: http://www.census.gov/population/projections/state/stpjpop.txt and http://www.census.gov/population/www/projections/stproj.html
Administrative Spatial Edits and Notes:
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