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Map 1
Show's the Population of the U.S. by State. The scale used allowed for 8 discrete
ranges. (Which shows just how large California's population is.
Map
2 is a shaded fill map of the Rohnert Park area showing the population by census
tract.
The Metropolitan areas surrounding San Francisco are shown in Map
3. The different shades represent the populations of each area.
In Map
4 I grouped the population of Marin County and Sonoma County by zip code.
I plotted the 13 Taco Bell "restaurants in Sonoma county in Map 5. The map displays their
annual sales (not real data) and the household incomes in their surrounding census tracts.
In map 6 shows the
Hispanic density and number of businesses in the Fort Worth area..
Maps can be plotted by: Census tract, ZIP
Code, City, County, MSA, State,
and Country
Census Tract
Census tracts are small, locally defined statistical areas in all metropolitan areas and other densely populated
counties. Census tracts usually have between 1,000 and 2,000 households; a typical tract has, on average, about
1,500 households. Census tracts never cross county or state boundaries. The physical size of census tracts varies widely
depending on the population density of the area.
ZIP Codes
ZIP Codes are administrative units established by the United States Postal Service
(USPS) for the distribution of mail. ZIP Codes are designed to serve areas for the most efficient delivery of mail and generally do not conform to census
defined areas. ZIP Codes can overlap census geography boundaries, especially counties and, less frequently, states.
ZIP Codes are frequently updated and changed to meet postal requirements, and do not cover all the land area of
the United States.
County
Counties are the primary political subdivisions of most states. In Louisiana, these are called parishes. Alaska does not
have counties; Alaska county equivalents are known as boroughs and census areas for statistical reporting. In four
states (Maryland, Missouri, Nevada, and Virginia), there are one or more cities that are independent of any county
organization. These cities are referred to as "independent cities" but are treated the same as counties for census
tabulations.
(MSA) Metropolitan Statistical Area
MSAs are areas established by the Federal Office of Management and Budget. MSAs are comprised of a large
population center and the surrounding communities that have economic and social ties to the population center.
MSAs are usually defined as groupings of counties except in New England, where MSAs are defined by cities and
towns rather than counties. MSAs were established for consistent statistical reporting of urban areas.
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