Census Data for Portland ...
The most recent Census Estimate<1> was for 2019 and it gave Portland a population of 654,378 people.
The last Decennial Census<2> was in 2010, which gave Portland a population of 583,776 people.
The city of Portland is located in Multnomah County. The 2010 Census gave Multnomah County; a population of 735,334 people. This means that Portland had 79.4% of the county's total population, making it Multnomah's most populous community.
At the same time, Oregon had a population of 3,831,074 people, meaning that Portland had 15.24% of the total population of Oregon - making it the state's most populous community.
The 2010 Census shows that the sampling area for Portland has a total area of 145.1 square miles [375.8 km²]. Of this total, 133.4 square miles [345.6 km²] is land, with the balance (8.04%) being water (11.66 square miles [30.2 km²]).
Multnomah County has a land area of 431.3 square miles [1,117.1 km²]. At 133.4 square miles [345.6 km²], Portland has 30.94% of the county's total land area.
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- When the Census Bureau conducts a census for a city like Portland, 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 city.
- Things like population, area and housing for Portland reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Portland 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: 45° 32' 13" (or 45.54°)
- Lon: -122° 38' 59" (or -122.65°)
- 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, Portland had 265,439 Housing Units<3> and with its population of 583,776 people, this averages 2.2 people per Housing Unit.
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- The 2010 Census shows Portland had a land area of 133.4 square miles [345.6 km²]. This translates to 1,829 Housing Units per square mile [706 housing units/km²].
- From the Census of 2000: Portland had 237,307 Housing Units, a population of 529,121 people and a land area of 134.3 square miles [347.9 km²]. This gives a density of 2.23 people per Housing Unit and 1,632 Housing Units per square mile [630 housing units/km²].
- Note: Repeating the caution above (under Population Density), be aware that when comparing Housing Units between the 2010 Census and the 2000 Census, there were changes in the sampling area for Portland 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).
Multnomah County ...
The community of Portland is primarily located in Multnomah County<4> and is the County Seat for Multnomah County. A portion of Portland extends into Clackamas County and Washington County.
The county had a population of 735,334 people at the 2010 Census. With it's population of 583,776 people, Portland represented 79.4% of the county's total.
In addition, where the city of Portland has a population density of 4,023 people per square mile [1,553 people/km²], Multnomah County averages 1,704 people per square mile [658 people/km²].
For more information, please visit our Census Page for Multnomah County.
Census-to-Census Observations ...
When the Census Bureau takes a census count (or enumeration) for Portland, 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 Portland. 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 Portland 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.
While generally coinciding with the GPS location (latitude/longitude) of Portland, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Portland.
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- For the 2010 Census, the location was given as:
- Lat: 45.536951° (or 45°32'13" N)
- Lon: -122.649971° (or -122°38'59" W)
- For the 2000 Census, the location given was:
- Lat: 45.523040° (or 45°31'22" N)
- Lon: -122.640155° (or -122°38'24" W)
- The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 5,657 feet to the northwest<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 (#2411471) to Portland. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Portland. The GNIS point has been mapped to the latitude/longitude:
- Lat: 45.537405° (or 45°32'14" N)
- Lon: -122.650280° (or -122°39'1" W)
- The GPS location given for the 2010 Census lies 183.4 feet to the southeast<6> of the point given by the GNIS for Portland. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Portland.
Miscellaneous Information for Portland ...
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 Multnomah County or the city of Portland:
- The GNIS Codes ...
- The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Portland:
- GNIS ID for Portland: 2411471
- GNIS ID for Multnomah County: 1135861
- GNIS ID for State of Oregon: 1155107
- Misc. Census Codes ...
- Portland is located in Census Region #4 (the West Region) and Division #9 (the Pacific Division).
For more information about the various Federal identification codes, please visit our Misc Page for Portland.
Other Roadside Stops ...
Find a Community in Oregon
About Multnomah County
Off-the-Road Links ...
The official website for Portland: www.portlandonline.com/
The official website for Multnomah County: www.co.multnomah.or.us/
The official website for State of Oregon: https://www.oregon.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)
|<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 Oregon's counties, including Multnomah, have changed over time, we recommend the Atlas of Historical County Boundaries.|
|<5>||The calculated bearing (or angle) to the 2010 Census location is 26 degrees and a distance of 5,657 feet.|
|<6>||The calculated bearing (or angle) to the GNIS point is 205 degrees and a distance of 183.4 feet.|