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Census Data for Twin Bridges

Population ...

The most recent Census Estimate<1> was for 2019 and it gave Twin Bridges a population of 422 people.

The last Decennial Census<2> was in 2010, which gave Twin Bridges a population of 375 people.

The town of Twin Bridges is located in Madison County. The 2010 Census gave Madison County; a population of 7,691 people. This means that Twin Bridges had 4.88% of the county's total population, making it Madison's 3rd most populous community.

At the same time, Montana had a population of 989,415 people, meaning that Twin Bridges had 0.04% of the total population of Montana - making it the state's 88th most populous community.

Area ...

The 2010 Census shows that the sampling area for Twin Bridges has a total area of 0.96 square miles [2.5 km²].

Madison County has a land area of 3,587 square miles [9,291.5 km²]. At 0.96 square miles [2.5 km²], Twin Bridges has 0.03% of the county's total land area.

  • Continue Reading ...
    • When the Census Bureau conducts a census for a town like Twin Bridges, 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 town.
    • Things like population, area and housing for Twin Bridges reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Twin Bridges 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' 33"   (or 45.54°)
    • Lon:   -112° 20' 1"   (or -112.33°)
    • 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, Twin Bridges had 206 Housing Units<3> and with its population of 375 people, this averages 1.82 people per Housing Unit.

  • Continue Reading ...
    • The 2010 Census shows Twin Bridges had a land area of 0.96 square miles [2.5 km²]. This translates to 215.5 Housing Units per square mile [83.2 housing units/km²].
    • From the Census of 2000: Twin Bridges had 216 Housing Units, a population of 400 people and a land area of 0.95 square miles [2.5 km²]. This gives a density of 1.85 people per Housing Unit and 226.5 Housing Units per square mile [87.5 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 Twin Bridges and you need to be careful when comparing values between the censuses. More information about the changes can be found in the section called Census-to-Census Observations ... (see below).

Madison County ...

The community of Twin Bridges is located in Madison County<4>.

The county had a population of 7,691 people at the 2010 Census. With it's population of 375 people, Twin Bridges represented 4.88% of the county's total.

In addition, where the town of Twin Bridges has a population density of 392.3 people per square mile [151.5 people/km²], Madison County averages 2.14 people per square mile [0.83 people/km²].

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

Census-to-Census Observations ...

Introduction ...

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

  • Continue Reading ...
    • For the 2010 Census, the location was given as:
    • Lat:   45.542747°   (or 45°32'33" N)
    • Lon:   -112.333730°   (or -112°20'1" W)
    • For the 2000 Census, the location given was:
    • Lat:   45.544683°   (or 45°32'40" N)
    • Lon:   -112.331579°   (or -112°19'53" W)
    • The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 894 feet to the southwest<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 (#2413407) to Twin Bridges. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Twin Bridges. The GNIS point has been mapped to the latitude/longitude:
    • Lat:   45.542746°   (or 45°32'33" N)
    • Lon:   -112.333700°   (or -112°20'1" W)
    • The GPS location given for the 2010 Census lies 7.67 feet to the west<6> of the point given by the GNIS for Twin Bridges. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Twin Bridges.

Miscellaneous Information for Twin Bridges ...

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 Madison County or the town of Twin Bridges:

  • The GNIS Codes ...
    • The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Twin Bridges:
    • GNIS ID for Twin Bridges: 2413407
    • GNIS ID for Madison County: 1720033
    • GNIS ID for State of Montana: 767982
  • Misc. Census Codes ...
    • Twin Bridges is located in Census Region #4 (the West Region) and Division #8 (the Mountain Division).

For more information about the various Federal identification codes, please visit our Misc Page for Twin Bridges.

Unfortunately, we don't know of a website for Twin Bridges. If you can help, please contact us through our Feedback Page.

The official website for State of Montana: https://mt.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 Montana's counties, including Madison, have changed over time, we recommend the Atlas of Historical County Boundaries.
<5>The calculated bearing (or angle) to the 2010 Census location is 142 degrees and a distance of 894 feet.
<6>The calculated bearing (or angle) to the GNIS point is 87 degrees and a distance of 7.67 feet.









 

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This page was last modified/updated: 10 Mar 2024