Census Data for Plum
Population ...
The most recent Census Estimate<1> was for 2019 and it gave Plum a population of 27,091 people.
The last Decennial Census<2> was in 2010, which gave Plum a population of 27,126 people.
The community of Plum is located in Allegheny County. The 2010 Census gave Allegheny County; a population of 1,223,348 people. This means that Plum had 2.22% of the county's total population, making it Allegheny's 4th most populous community.
At the same time, Pennsylvania had a population of 12,702,379 people, meaning that Plum had 0.21% of the total population of Pennsylvania - making it the state's 19th most populous community.
Area ...
The 2010 Census shows that the sampling area for Plum has a total area of 28.96 square miles [75 km²]. Of this total, 28.58 square miles [74 km²] is land, with the balance (1.31%) being water (0.38 square miles [1 km²]).
Allegheny County has a land area of 730 square miles [1,890.9 km²]. At 28.58 square miles [74 km²], Plum has 3.91% of the county's total land area.
- Continue Reading ...
- When the Census Bureau conducts a census for a community like Plum, they draw a boundary around the area in which they are going to conduct their count - this defines the sampling area (usually 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 community.
- Things like population, area and housing for Plum reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Plum might be different, it's best to check with the U.S. Census Bureau to resolve any difference between the two.
- 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: 40° 30' 8" (or 40.5°)
- Lon: -79° 45' 9" (or -79.75°)
- More information on this topic and the changes between the 2000 Census and the 2010 Census can be found in the section for our Census-to-Census Observations ... (see below).
Housing Units ...
At the time of the 2010 Census, Plum had 11,494 Housing Units<3> and with its population of 27,126 people, this averages 2.36 people per Housing Unit.
- Continue Reading ...
- The 2010 Census shows Plum had a land area of 28.58 square miles [74 km²]. This translates to 396.9 Housing Units per square mile [153.2 housing units/km²].
- From the Census of 2000: Plum had 10,624 Housing Units, a population of 26,940 people and a land area of 28.63 square miles [74.1 km²]. This gives a density of 2.54 people per Housing Unit and 366.2 Housing Units per square mile [141.4 housing units/km²].
- Note: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2010 and the 2000 Census, there were changes in the sampling area for Plum and you need to be careful when comparing numbers between the censuses. More information about these differences can be found in the section called Census-to-Census Observations ... (see below).
Allegheny County ...
Plum is located in Allegheny County<4>.
The county had a population of 1,223,348 people at the 2010 Census. With it's population of 27,126 people, Plum represented 2.22% of the county's total.
In addition, where the community of Plum has a population density of 936 people per square mile [361.7 people/km²], Allegheny County averages 1,675 people per square mile [646 people/km²].
For more information, please visit our Census Page for Allegheny County.
Census-to-Census Observations ...
Introduction ...
When the Census Bureau takes a census count (or enumeration) for Plum, they start by specifying the boundaries of the area to be counted. This area (or sampling area) is a polygon and its shape can be quite complex - it may or may not match the geographical boundaries of Plum. It's important to note that from one Census to the next, the shape and location of the polygon can change.
- Continue Reading ...
- Although we don't have specific information about the shape of the polygon for Plum or how it changed has over time, there is some information that can give us some hints. For example, since the shape of the sampling area is directly related to the shape of the polygon, any change to area probably indicates a new shape for the polygon.
- If you need precision or details about the methodology of the Census, you should visit the U.S. Census Bureau for a definitive answer.
Location ...
While generally coinciding with the GPS location (latitude/longitude) of Plum, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Plum.
- Continue Reading ...
- For the 2010 Census, the location was given as:
- Lat: 40.502471° (or 40°30'8" N)
- Lon: -79.752630° (or -79°45'9" W)
- For the 2000 Census, the location given was:
- Lat: 40.494110° (or 40°29'38" N)
- Lon: -79.754477° (or -79°45'16" W)
- The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 3,090 feet to the north<5> of the location that was used in the 2000 Census.
- The U.S. Geological Survey (USGS) and the U.S. Board on Geographic Names (BGN) have assigned a unique GNIS identifier (#1217440) to Plum. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Plum. The GNIS point has been mapped to the latitude/longitude:
- Lat: 40.502290° (or 40°30'8" N)
- Lon: -79.746436° (or -79°44'47" W)
- The GPS location given for the 2010 Census lies 1,718 feet to the west<6> of the point given by the GNIS for Plum. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Plum.
Miscellaneous Information for Plum ...
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 Allegheny County or the community of Plum:
- The GNIS Codes ...
- The FIPS Codes ...
- An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
- State Code: 42 (Pennsylvania)
- County Code: 003 (Allegheny County)
- Place Code: 61536 (Plum)
- State & County Code: 42/003 (Pennsylvania / Allegheny County)
- State & Place Code: 42/61536 (Pennsylvania / Plum)
- Misc. Census Codes ...
- Plum is located in Census Region #1 (the Northeast Region) and Division #2 (the Middle Atlantic Division).
For more information about the various Federal identification codes, please visit our Misc Page for Plum.
Off-the-Road Links ...
The official website for Plum: www.plumboro.com/
The official website for Allegheny County: www.county.allegheny.pa.us/
The official website for State of Pennsylvania: https://www.pa.gov/
The official website of the U.S. Census Bureau
The official website of the U.S. Board on Geographic Names (BGN)
The official website of the U.S. Geological Survey (USGS)
Footnotes ...
| <1> | Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019. |
| <2> | Every 10 years (eg- 1990, 2000, 2010), the US Census Bureau conducts a Constitutionally-mandated count (or enumeration) of people living within the United States. This count is called a Decennial Census. The last Decennial Census was the 2010 Census, with the next one planned for 2020. |
| <3> | A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway). |
| <4> | If you're interested in how the shape of Pennsylvania's counties, including Allegheny, have changed over time, we recommend the Atlas of Historical County Boundaries. |
| <5> | The calculated bearing (or angle) to the 2010 Census location is 350 degrees and a distance of 3,090 feet. |
| <6> | The calculated bearing (or angle) to the GNIS point is 87 degrees and a distance of 1,718 feet. |