Census Data for Nampa
Population ...
The most recent Census Estimate<1> was for 2019 and it gave Nampa a population of 99,502 people.
The last Decennial Census<2> was in 2010, which gave Nampa a population of 81,557 people.
The city of Nampa is located in Canyon County. The 2010 Census gave Canyon County; a population of 188,923 people. This means that Nampa had 43.17% of the county's total population, making it Canyon's most populous community.
At the same time, Idaho had a population of 1,567,582 people, meaning that Nampa had 5.2% of the total population of Idaho - making it the state's 2nd most populous community.
Area ...
The 2010 Census shows that the sampling area for Nampa has a total area of 31.34 square miles [81.2 km²]. Of this total, a small amount of the area is covered by water (0.15 square miles [0.4 km²]).
Canyon County has a land area of 587 square miles [1,521.3 km²]. At 31.19 square miles [80.8 km²], Nampa has 5.31% of the county's total land area.
- Continue Reading ...
- When the Census Bureau conducts a census for a city like Nampa, 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 Nampa reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Nampa 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: 43° 34' 56" (or 43.58°)
- Lon: -116° 33' 49" (or -116.56°)
- 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, Nampa had 30,507 Housing Units<3> and with its population of 81,557 people, this averages 2.67 people per Housing Unit.
- Continue Reading ...
- The 2010 Census shows Nampa had a land area of 31.19 square miles [80.8 km²]. This translates to 973 Housing Units per square mile [375.8 housing units/km²].
- From the Census of 2000: Nampa had 19,379 Housing Units, a population of 51,867 people and a land area of 19.85 square miles [51.4 km²]. This gives a density of 2.68 people per Housing Unit and 975 Housing Units per square mile [376.5 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 Nampa and you need to be careful when comparing between the censuses. More information about the nature of these the changes can be found in the section called Census-to-Census Observations ... (see below).
Canyon County ...
Nampa is located in Canyon County<4>.
The county had a population of 188,923 people at the 2010 Census. With it's population of 81,557 people, Nampa represented 43.17% of the county's total.
In addition, where the city of Nampa has a population density of 2,602 people per square mile [1,004 people/km²], Canyon County averages 321.6 people per square mile [124.2 people/km²].
For more information, please visit our Census Page for Canyon County.
Census-to-Census Observations ...
Introduction ...
When the Census Bureau takes a census count (or enumeration) for Nampa, 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 Nampa. 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 Nampa 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 Nampa, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Nampa.
- Continue Reading ...
- For the 2010 Census, the location was given as:
- Lat: 43.582381° (or 43°34'56" N)
- Lon: -116.563875° (or -116°33'49" W)
- For the 2000 Census, the location given was:
- Lat: 43.574807° (or 43°34'29" N)
- Lon: -116.563559° (or -116°33'48" W)
- The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 2,762 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 (#2411208) to Nampa. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Nampa. The GNIS point has been mapped to the latitude/longitude:
- Lat: 43.582305° (or 43°34'56" N)
- Lon: -116.564490° (or -116°33'52" W)
- The GPS location given for the 2010 Census lies 164.8 feet to the east<6> of the point given by the GNIS for Nampa. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Nampa.
Miscellaneous Information for Nampa ...
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 Canyon County or the city of Nampa:
- The GNIS Codes ...
- The FIPS Codes ...
- An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
- State Code: 16 (Idaho)
- County Code: 027 (Canyon County)
- Place Code: 56260 (Nampa)
- State & County Code: 16/027 (Idaho / Canyon County)
- State & Place Code: 16/56260 (Idaho / Nampa)
- Misc. Census Codes ...
- Nampa is located in Census Region #4 (the West Region) and Division #8 (the Mountain Division).
- The US Postal Service ZIP Code ...
- While some people have used ZIP codes to identify a community, the ZIP codes were actually created to make mail delivery more efficient by grouping addresses together. Although a ZIP Code doesn't specifically identify a city like Nampa, they do identify addresses that are in (or near) the city. It's important to remember that the boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes.
- Our list of ZIP codes for Nampa:<7>
- 83651, 83652, 83686 & 83687.
- 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 Nampa.
Off-the-Road Links ...
The official website for Nampa: www.ci.nampa.id.us/
The official website for Canyon County: www.canyoncounty.org/
The official website for State of Idaho: www.state.id.us/
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 Idaho's counties, including Canyon, have changed over time, we recommend the Atlas of Historical County Boundaries. |
| <5> | The calculated bearing (or angle) to the 2010 Census location is 1 degrees and a distance of 2,762 feet. |
| <6> | The calculated bearing (or angle) to the GNIS point is 279 degrees and a distance of 164.8 feet. |
| <7> | When looking for a ZIP Code, whether Nampa or elsewhere, it's always best to check the website of the United States Postal Service (USPS). |