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Cambridge population

Cambridge, Massachusetts had an estimated 122,588 residents on July 1, 2025, the 251st-largest city in the US. That is up 16.6% since the 2010 Census and up 21% since 2000.

CambridgeMassachusettsPop. 122,588
Population, July 2025
122,588+3.5% since April 2020
People per sq mile
19,1636.4 sq mi of land
Median age
30.412.2% are 65 or older
Households with kids
17.7%with anyone under 18

Population by year, 2000 to 2025

80k91k101k112k123k2000: 101,32220002001: 102,0482002: 101,95920022003: 101,7272004: 101,54220042005: 101,4402006: 101,87620062007: 102,3132008: 103,29820082009: 104,6652010: 105,16220102011: 105,9042012: 107,91320122013: 112,0762014: 113,04120142015: 113,5282016: 115,76020162017: 116,9432018: 118,19120182019: 118,9882020: 118,39520202021: 112,9712022: 119,86120222023: 121,1862024: 121,83720242025: 122,5882025
Darker bars are the April 2000, 2010 and 2020 benchmarks; the rest are July 1 estimates. Source: US Census Bureau population estimates (intercensal 2000-2010, Vintage 2020 and Vintage 2025).
YearPopulationChangeBasis
2025122,588+751Estimate, July 1
2024121,837+651Estimate, July 1
2023121,186+1,325Estimate, July 1
2022119,861+6,890Estimate, July 1
2021112,971-5,424Estimate, July 1
2020118,395-593April 2020 estimates base
2019118,988+797Estimate, July 1
2018118,191+1,248Estimate, July 1
2017116,943+1,183Estimate, July 1
2016115,760+2,232Estimate, July 1
2015113,528+487Estimate, July 1
2014113,041+965Estimate, July 1
2013112,076+4,163Estimate, July 1
2012107,913+2,009Estimate, July 1
2011105,904+742Estimate, July 1
2010105,162+4972010 Census (April 1)
2009104,665+1,367Estimate, July 1
2008103,298+985Estimate, July 1
2007102,313+437Estimate, July 1
2006101,876+436Estimate, July 1
2005101,440-102Estimate, July 1
2004101,542-185Estimate, July 1
2003101,727-232Estimate, July 1
2002101,959-89Estimate, July 1
2001102,048+726Estimate, July 1
2000101,322April 2000 estimates base

Year-to-year changes across 2010 and 2020 mix census counts with estimates, so small jumps at those years are partly method changes.

Frequently asked questions

What is the population of Cambridge in 2025?

The Census Bureau estimates Cambridge had 122,588 residents on July 1, 2025, making it the 251st-largest city in the US.

Is Cambridge growing?

Yes. Cambridge has grown 16.6% since the 2010 Census (105,162 people), and grown 3.5% since 2020.

What was the population of Cambridge in 2000?

About 101,322 (the Census Bureau's April 2000 estimates base). By the 2010 Census it was 105,162.

How dense is Cambridge?

Cambridge has about 19,163 people per square mile of land (6.4 square miles).

More about Cambridge

See cost of living, jobs and commutes in Cambridge, Cambridge weather by month, or every Cambridge ZIP code. For the biggest cities in the country, see the largest US cities.