Census Data for Groton ...
The most recent Census Estimate<1> was for 2019 and it gave Groton a population of 38,358 people.
The last Decennial Census<2> was in 2010, which gave Groton a population of 40,115 people.
The community of Groton is located in New London County. The 2010 Census gave New London County; a population of 274,055 people. This means that Groton had 14.64% of the county's total population, making it New London's 3rd most populous community.
At the same time, Connecticut had a population of 3,574,097 people, meaning that Groton had 1.12% of the total population of Connecticut - making it the state's 39th most populous community.
The 2010 Census shows that the sampling area for Groton has a total area of 45.28 square miles [117.3 km²]. Of this total, 31.03 square miles [80.4 km²] is land, with the balance (31.47%) being water (14.25 square miles [36.9 km²]).
New London County has a land area of 664 square miles [1,722 km²]. At 31.03 square miles [80.4 km²], Groton has 4.67% of the county's total land area.
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- When the Census Bureau conducts a census for a community like Groton, 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 Groton reflect the sampling area. Since the shape of the sampling area and the actual boundaries of Groton 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' 51" (or 41.35°)
- Lon: -72° 1' 52" (or -72.03°)
- 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, Groton had 17,978 Housing Units<3> and with its population of 40,115 people, this averages 2.23 people per Housing Unit.
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- The 2010 Census shows Groton had a land area of 31.03 square miles [80.4 km²]. This translates to 397 Housing Units per square mile [153.3 housing units/km²].
- From the Census of 2000: Groton had 16,817 Housing Units, a population of 39,907 people and a land area of 31.3 square miles [81.1 km²]. This gives a density of 2.37 people per Housing Unit and 372.1 Housing Units per square mile [143.7 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 Groton 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).
New London County ...
The community of Groton is located in New London County<4>.
The county had a population of 274,055 people at the 2010 Census. With it's population of 40,115 people, Groton represented 14.64% of the county's total.
In addition, where the community of Groton has a population density of 885 people per square mile [342 people/km²], New London County averages 412.2 people per square mile [159.1 people/km²].
For more information, please visit our Census Page for New London County.
Census-to-Census Observations ...
When the Census Bureau takes a census count (or enumeration) for Groton, 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 Groton. It's important to note that from one Census to the next, the shape and location of the polygon can change.
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- Although we don't have specific information about the shape of the polygon for Groton 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 Groton, the latitude and longitude given by the Census Bureau actually indicates the GPS location of the polygon for Groton.
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- For the 2010 Census, the location was given as:
- Lat: 41.347573° (or 41°20'51" N)
- Lon: -72.031336° (or -72°1'52" W)
- For the 2000 Census, the location given was:
- Lat: 41.350862° (or 41°21'3" N)
- Lon: -72.028455° (or -72°1'42" W)
- The difference indicates that the U.S. Census Bureau moved the location of the polygon for the 2010 Census 1,435 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 (#213437) to Groton. This identifier also marks a GPS point on the map, and that point lies within the boundaries of Groton. The GNIS point has been mapped to the latitude/longitude:
- Lat: 41.345932° (or 41°20'45" N)
- Lon: -72.029797° (or -72°1'47" W)
- The GPS location given for the 2010 Census lies 731 feet to the northwest<6> of the point given by the GNIS for Groton. For more information about this and the relationship of the various Federal Codes, please visit our Misc Page for Groton.
Miscellaneous Information for Groton ...
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 London County or the community of Groton:
- The GNIS Codes ...
- The current system of identification is called the Geographic Names Information System (GNIS). The following GNIS codes relate to Groton:
- GNIS ID for Groton: 213437
- GNIS ID for New London County: 212799
- GNIS ID for State of Connecticut: 1779780
- Misc. Census Codes ...
- Groton 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 Groton.
Off-the-Road Links ...
Unfortunately, we don't know of a website for Groton. If you can help, please contact us through our Feedback Page.
The official website for State of Connecticut: https://portal.ct.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 Connecticut's counties, including New London, have changed over time, we recommend the Atlas of Historical County Boundaries.|
|<5>||The calculated bearing (or angle) to the 2010 Census location is 146 degrees and a distance of 1,435 feet.|
|<6>||The calculated bearing (or angle) to the GNIS point is 35 degrees and a distance of 731 feet.|