A Gazetteer for the United States and Canada

Town of Madison, Connecticut

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Census Data for Madison ...

Population ...

The most recent Census Estimate<1> was for 2019 and it gave Madison a population of 18,030 people.

The last Decennial Census<2> was in 2010, which gave Madison a population of 18,269 people.

The community of Madison is located in New Haven County. The 2010 Census gave New Haven County; a population of 862,477 people. This means that Madison had 2.12% of the county's total population, making it New Haven's 22nd most populous community.

At the same time, Connecticut had a population of 3,574,097 people, meaning that Madison had 0.51% of the total population of Connecticut - making it the state's 82nd most populous community.

Area ...

The 2010 Census shows that the sampling area for Madison has a total area of 36.63 square miles [94.9 km²]. Of this total, 36.15 square miles [93.6 km²] is land, with the balance (1.32%) being water (0.48 square miles [1.3 km²]).

New Haven County has a land area of 604 square miles [1,565.7 km²]. At 36.15 square miles [93.6 km²], Madison has 5.98% of the county's total land area.

  • Continue Reading ...
    • When the Census Bureau conducts a census for a community like Madison, 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 Madison reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Madison 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:   41° 20' 48"   (or 41.35°)
    • Lon:   -72° 37' 31"   (or -72.63°)
    • 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, Madison had 8,049 Housing Units<3> and with its population of 18,269 people, this averages 2.27 people per Housing Unit.

  • Continue Reading ...
    • The 2010 Census shows Madison had a land area of 36.15 square miles [93.6 km²]. This translates to 219.7 Housing Units per square mile [84.8 housing units/km²].
    • From the Census of 2000: Madison had 7,386 Housing Units, a population of 17,858 people and a land area of 36.2 square miles [93.8 km²]. This gives a density of 2.42 people per Housing Unit and 200.8 Housing Units per square mile [77.5 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 Madison and you need to be careful when comparing between the censuses. More information about these differences can be found in the section called Census-to-Census Observations ... (see below).

New Haven County ...

The community of Madison is located in New Haven County<4>.

The county had a population of 862,477 people at the 2010 Census. With it's population of 18,269 people, Madison represented 2.12% of the county's total.

In addition, where the community of Madison has a population density of 498.7 people per square mile [192.6 people/km²], New Haven County averages 1,426 people per square mile [550 people/km²].

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

Census-to-Census Observations ...

Introduction ...

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

  • Continue Reading ...
    • For the 2010 Census, the location was given as:
    • Lat:   41.346749°   (or 41°20'48" N)
    • Lon:   -72.625456°   (or -72°37'31" W)
    • For the 2000 Census, the location given was:
    • Lat:   41.298648°   (or 41°17'55" N)
    • Lon:   -72.609384°   (or -72°36'33" W)
    • The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 3 miles 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 (#213454) to Madison. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Madison. The GNIS point has been mapped to the latitude/longitude:
    • Lat:   41.337876°   (or 41°20'16" N)
    • Lon:   -72.629538°   (or -72°37'46" W)
    • The GPS location given for the 2010 Census lies 3,422 feet to the north<6> of the point given by the GNIS for Madison. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Madison.

Miscellaneous Information for Madison ...

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 New Haven County or the community of Madison:

  • The GNIS Codes ...
    • The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Madison:
    • GNIS ID for Madison: 213454
    • GNIS ID for New Haven County: 212798
    • GNIS ID for State of Connecticut: 1779780
  • Misc. Census Codes ...
    • Madison is located in Census Region #1 (the Northeast Region) and Division #1 (the New England Division).

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

Other Roadside Stops ...

Find a Community in Connecticut

About New Haven County

About Connecticut

Off-the-Road Links ...

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

The official website for State of Connecticut:

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 Connecticut's counties, including New Haven, have changed over time, we recommend the Atlas of Historical County Boundaries.
<5>The calculated bearing (or angle) to the 2010 Census location is 14 degrees and a distance of 3 miles.
<6>The calculated bearing (or angle) to the GNIS point is 340 degrees and a distance of 3,422 feet.






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This page was last modified: 11 May 2021