Massachusetts · Census place 2573405
Watertown, Massachusetts
Watertown is a city in Middlesex County, Massachusetts with an estimated 35,985 residents on July 1, 2024. It is the 40th largest of 58 incorporated places of 1,000+ people in the state.
- Population 2024
- 35,985
- #40 of 58 in Massachusetts
- Change since 2020
- +1.7%
- +616 people
- Land area
- 4.0 sq mi
- + 0.13 sq mi water
- Density
- 8,996 / sq mi
- State median 2,852
Measure from here
Tools and pages that start from Watertown
Watertown population, 2020 to 2024
Watertown added 616 residents from July 2020 to July 2024, a change of +1.7%. In the latest year it moved by +333. Among 58 Massachusetts places of 5,000 or more, that growth ranks 23rd; the median place changed by +1.2%. The median place of 5,000+ in Massachusetts has 44,052 people, so Watertown is 82% of it.
Watertown covers 4.00 square miles of land and 0.13 of water, for 8,996 people per square mile of land. The median Massachusetts place of 5,000+ has 2,852, so Watertown is denser than the typical town.
What county Watertown is in
All of Watertown's residents live in Middlesex County, which had 1,668,956 residents in 2024. Watertown holds 2.2% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.
ZIP codes in Watertown
No ZIP Code Tabulation Area overlaps Watertown by at least 10% of either area. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.
Where Watertown is
The Census internal point of Watertown is at 42.369500, -71.177900. Boston, the capital, is 5.9 miles E in a straight line. The nearest larger place is Newton, MA (90,700 people), 3.0 miles away. The nearest city of 100,000 or more is Cambridge, MA, 3.0 miles away.
Internal point
- Decimal
- 42.369500, -71.177900
- DMS
- 42°22'10.20"N 71°10'40.44"W
- UTM
- 19N 320674.7E 4693100.1N
- Geohash
- drt3h31u4
- Plus code
- 87JC9R9C+RR
Daylight in Watertown
At 42.37° N, Watertown gets about 15 h 17 min of daylight around the June solstice and 9 h 04 min around the December solstice, a swing of 6 h 13 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.
Places near Watertown
The eight nearest incorporated places of 1,000+ in Massachusetts, measured between internal points. The closest is Newton, 3.0 miles away, with 90,700 people.
Questions people ask
What is the population of Watertown, MA?
35,985 on July 1, 2024, in the Census Vintage 2024 estimates. That is up 616 (1.7%) from 35,369 in July 2020.
What county is Watertown in?
Middlesex County. All of its residents live in that county.
What ZIP codes cover Watertown?
No ZCTA overlaps Watertown by 10% or more of either area in the 2020 relationship file.
How far is Watertown from Boston?
5.9 miles (9.4 km) in a straight line, heading E from Watertown.
What is the nearest larger city to Watertown?
Newton, MA, with 90,700 residents, 3.0 miles away between internal points.
Sources and data as of
Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.
- 01Census Vintage 2024 subcounty population estimates
- 02Census 2024 Gazetteer, places
- 03Census 2020 ZCTA to place relationship file
- 04Census 2024 cartographic boundary file, counties (1:5,000,000)
How every number is computed: methodology. Spotted a wrong figure? Report an error.