A Gazetteer for the United States and Canada
Census Data for Clay ...
The last Decennial Census<1> was in 2010, which gave Clay a population of 9,708 people.
The city of Clay is located in Jefferson County. The 2010 Census gave Jefferson County a population of 658,466 people. This means that Clay had 1.47% of the county's total population, making it Jefferson's 15th most populous community.
When the Census Bureau conducts a census for a city like Clay, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually shaped as a polygon). The shape of the sampling area can be quite complex and it's important to keep in mind that the boundaries of the sampling area may or may not match the recognized boundaries of the city.
Things like the population, area and housing for Clay reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Clay might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.
The 2010 Census shows that the sampling area for Clay has a total area of 9.99 square miles [25.9 km²]. Of this total, a small amount of the area is covered by water (0.06 square miles [0.2 km²]).
Jefferson County has a land area of 1,111 square miles [2,878.2 km²]. At 9.93 square miles [25.7 km²], Clay has 0.89% of the county's total land area.
Not only does the sampling area define boundaries, it also has a GPS location (latitude & longitude) that indicates a point within the sampling area (usually the center of the polygon, known as the centroid). At the time of the 2010 Census, the sampling area was located at:
Lat: 33° 41' 51" (or 33.7°) [Map]
Population Density ...
Using the population (9,708 people) and land area (9.93 square miles [25.7 km²]) values from the 2010 Census, Clay had a population density of 971 people per square mile [375 people/km²].
Housing Units ...
At the time of the 2010 Census, Clay had 3,799 Housing Units<2> and with its population of 9,708 people, this averages 2.56 people per Housing Unit.
The 2010 Census shows Clay had a land area of 9.93 square miles [25.7 km²]. This translates to 380.1 Housing Units per square mile [146.8 housing units/km²].
Jefferson County ...
The city of Clay is located in Jefferson County.
The county had a population of 658,466 people at the 2010 Census. With it's population of 9,708 people, Clay represented 1.47% of the county's total.
In addition, where the city of Clay has a population density of 971 people per square mile [375 people/km²], Jefferson County averages 592 people per square mile [228.8 people/km²].
For more information, please visit our Census Page for Jefferson County.
Miscellaneous Information for Clay ...
The Federal government has assigned various identifying codes to each community, county and state. At one time or another, the US Census Bureau has used one (or more) of the following identifiers when referring to either Jefferson County or the city of Clay:
The GNIS Codes ...
The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Clay:
GNIS ID for Clay: 2404063
The FIPS Codes ...
An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
State Code: 01 (Alabama)
County Code: 073 (Jefferson County)
Place Code: 15256 (Clay)
Misc. Census Codes ...
Clay is located in Census Region #3 (the South Region) and Division #6 (the East South-Central Division).
The US Postal Service ZIP Code ...
While some people have used a ZIP code to identify a community, the purpose of the ZIP code was to make mail delivery more efficient by grouping addresses together. Although the ZIP Code doesn't specifically identify a city like Clay, it does identify addresses that are in (or near) Clay. It's important to remember that the boundaries of a ZIP Code can be changed, re-assigned or overlapped with other ZIP Codes.
The ZIP code for Clay: 35048<3>
Census ZCTA Codes ...
The US Census Bureau created statistical entities that they call ZIP Code Tabulation Areas (ZCTAs) and these ZCTAs are frequently confused with the ZIP codes that come from the US Postal Service (USPS).
ZCTAs were first created for the 2000 Census and at that time, they were based upon the USPS ZIP codes. While largely covering the same areas, the boundaries of a ZCTA do not necessarily match the boundaries of a postal ZIP code with the same number. For example, while a postal ZIP code can cross a county or state line, a Census ZCTA can not. They should be treated as separate entities with no correlation between them.
For more information about the various Federal identification codes, please visit our Misc Page for Clay.
Other Roadside Stops ...
Off-the-Road Links ...
The official website of the U.S. Census Bureau
Unfortunately, we don't know of a website for Clay. If you can help, please contact us through our Feedback Page.
The official website for Jefferson County: www.jeffcointouch.com/
The official website for State of Alabama: https://www.alabama.gov/
The official website of the U.S. Board on Geographic Names (BGN)
The official website of the U.S. Geological Survey (USGS)
Please keep in mind that we can not guarantee the accuracy or timeliness of the information on this website, so use with care. We encourage you to double-check the information that is critical to you.
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This page was last modified: 19 Jan 2019