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Summary for Chelsea

About Chelsea (Click for our profile page)

Located in: Suffolk County (see below)

Time Zone: Chelsea lies in the Eastern Time Zone (EST/EDT)

Telephone Area Codes: 617 & 857<1>

ZIP Code: 02150<2>

Elevation: Near sea level<3>

From the 2010 US Census (For more detail, see our Census Page for Chelsea)

Population

Year	Population
2019 Est:<4>	39,669 (12.77% increase since 2010)
2010:	35,177 (0.28% increase since 2000)
2000:	35,080

Total Area:<5> 2.46 sq. miles [6.4 km²] - of which 10.01% is water (0.25 sq. miles [0.6 km²])

Housing Units:<6> 12,621

Official Website: www.ci.chelsea.ma.us/

GPS Coordinates (Latitude/Longitude)<7>

For the purpose of mapping and calculating distances, we have chosen the following reference point for Chelsea:

Lat: 42.392700° (or 42°23'33" N)

Lon: -71.034100° (or -71°2'2" W)

USGS Topo Map: Boston North<8>

Federal GNIS/FIPS Codes for Chelsea

GNIS ID: 619464

FIPS State / Place Code: 25 / 13205

(For more about Federal Codes, see our Misc Page for Chelsea)

About Suffolk County

The city of Boston is the County Seat for {Suffolk County}.

From the 2010 US Census (For more detail, see our Census Page for Suffolk)

Population

Year	Population
2019 Est:	803,907 (10.77% increase since 2010)
2010	725,772 (5.21% increase since 2000)
2000:	689,807

Total Area: 120.2 sq. miles [311.4 km²] - of which 51.6% is water (62.1 sq. miles [160.7 km²])

Housing Units: 315,522

Federal GNIS/FIPS Codes for Suffolk

GNIS ID: 606939

FIPS State / County Code: 25 / 025

(For more about Federal Codes, see our Misc Page for Chelsea)

About Massachusetts

From the US Census

Population

Year	Population
2019 Est:	6,894,883 (5.3% increase since 2010)
2010:	6,547,629 (3.13% increase since 2000)
2000:	6,349,097

Websites for State of Massachusetts

Official Website: https://www.mass.gov/

Tourism: https://www.visitma.com/

Parks: https://www.mass.gov/visit-massachusetts-state-parks

Fishing: https://www.mass.gov/freshwater-fishing

Hunting: https://www.mass.gov/topics/hunting

Federal GNIS/FIPS Codes for State of Massachusetts

GNIS ID: 606926

FIPS State: 25

(For more about Federal Codes, see our Misc Page for Chelsea)

Footnotes ...

<1>	When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 617 code has been Overlayed with the 857 area code. New phone numbers in the Chelsea area will be assigned with one of these codes: 617 or 857. As a result, placing a call in the Chelsea area will require 10-digit dialing (where you enter both the area code and then the phone number).
<2>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as Chelsea). When looking for a ZIP Code, whether Chelsea or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<3>	The elevation is an estimate for the area around Chelsea - it will be higher in some places and lower in others.
<4>	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.
<5>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Chelsea. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<6>	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).
<7>	Longitude & latitude values may not be the geographic center of Chelsea, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<8>	Name of the USGS 7.5 Minute topographic map which includes Chelsea.