Census Data for Bainbridge Island

Population ...

The most recent Census Estimate<1> was for 2019 and it gave Bainbridge Island a population of 25,348 people.

The last Decennial Census<2> was in 2010, which gave Bainbridge Island a population of 23,025 people.

The city of Bainbridge Island is located in Kitsap County. The 2010 Census gave Kitsap County; a population of 251,681 people. This means that Bainbridge Island had 9.15% of the county's total population, making it Kitsap's 2nd most populous community.

At the same time, Washington had a population of 6,724,540 people, meaning that Bainbridge Island had 0.34% of the total population of Washington - making it the state's 41st most populous community.

Area ...

The 2010 Census shows that the sampling area for Bainbridge Island has a total area of 65 square miles [168.4 km²]. Of this total, 27.61 square miles [71.5 km²] is land, with the balance (57.5%) being water (37.41 square miles [96.9 km²]).

Kitsap County has a land area of 394.9 square miles [1,022.9 km²]. At 27.61 square miles [71.5 km²], Bainbridge Island has 6.99% of the county's total land area.

• Continue Reading ...
  • When the Census Bureau conducts a census for a city like Bainbridge Island, 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 Bainbridge Island reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Bainbridge Island 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:   47° 38' 57"   (or 47.65°)
  • Lon:   -122° 30' 53"   (or -122.51°)
  • 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, Bainbridge Island had 10,584 Housing Units<3> and with its population of 23,025 people, this averages 2.18 people per Housing Unit.

• Continue Reading ...
  • The 2010 Census shows Bainbridge Island had a land area of 27.61 square miles [71.5 km²]. This translates to 162.8 Housing Units per square mile [62.8 housing units/km²].
  • From the Census of 2000: Bainbridge Island had 8,517 Housing Units, a population of 20,308 people and a land area of 27.61 square miles [71.5 km²]. This gives a density of 2.38 people per Housing Unit and 130 Housing Units per square mile [50.2 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 Bainbridge Island and you need to be careful when comparing results between the censuses. More information about these differences can be found in the section called Census-to-Census Observations ... (see below).

Kitsap County ...

Bainbridge Island<4> is located in Kitsap County<5>.

The county had a population of 251,681 people at the 2010 Census. With it's population of 23,025 people, Bainbridge Island represented 9.15% of the county's total.

In addition, where the city of Bainbridge Island has a population density of 354.1 people per square mile [136.7 people/km²], Kitsap County averages 637 people per square mile [246 people/km²].

For more information, please visit our Census Page for Kitsap County.

Census-to-Census Observations ...

Introduction ...

When the Census Bureau takes a census count (or enumeration) for Bainbridge Island, 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 Bainbridge Island. 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 Bainbridge Island 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 Bainbridge Island, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Bainbridge Island.

• Continue Reading ...
  • For the 2010 Census, the location was given as:
  • Lat:   47.649254°   (or 47°38'57" N)
  • Lon:   -122.514838°   (or -122°30'53" W)
  • For the 2000 Census, the location given was:
  • Lat:   47.655260°   (or 47°39'18" N)
  • Lon:   -122.535083°   (or -122°32'6" W)
  • The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 5,432 feet to the southeast<6> 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 (#2409770) to Bainbridge Island. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Bainbridge Island. The GNIS point has been mapped to the latitude/longitude:
  • Lat:   47.653431°   (or 47°39'12" N)
  • Lon:   -122.515180°   (or -122°30'54" W)
  • The GPS location given for the 2010 Census lies 1,525 feet to the south<7> of the point given by the GNIS for Bainbridge Island. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Bainbridge Island.

Miscellaneous Information for Bainbridge Island ...

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 Kitsap County or the city of Bainbridge Island:

• The GNIS Codes ...
  • The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Bainbridge Island:
  • GNIS ID for Bainbridge Island: 2409770
  • GNIS ID for Kitsap County: 1529223
  • GNIS ID for State of Washington: 1779804

• The FIPS Codes ...
  • An earlier (and largely obsolete) identification method was called the Federal Information Processing Standard (FIPS):
  • State Code: 53 (Washington)
  • County Code: 035 (Kitsap County)
  • Place Code: 03736 (Bainbridge Island)
  • State & County Code: 53/035 (Washington / Kitsap County)
  • State & Place Code: 53/03736 (Washington / Bainbridge Island)

• Misc. Census Codes ...
  • Bainbridge Island is located in Census Region #4 (the West Region) and Division #9 (the Pacific 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 Bainbridge Island, it does identify addresses that are in (or near) Bainbridge Island. 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 Bainbridge Island:98110<8>

• 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 Bainbridge Island.