Middlesex, Massachusetts
- ZIP codes
- 111
- Postal place names
- 78
Overview
Middlesex is a county-level name in the Massachusetts postal directory. Associated postal places include Cambridge, Framingham, Lowell.
Regional context
- State / postal region
- Massachusetts
- Associated postal places
- CambridgeFraminghamLowell
Population overview
- Estimated population
- 1,669,979
- Reference year
- 2025
Population of the matched statistical area, not a ZIP delivery area.
Community snapshot
Estimates for the matched Census geography; not a sum of ZIPs.
- Median household income
- $130,847
- ACS 2020–2024 · USD 2024
- Median owner-occupied home value
- $727,800
- ACS 2020–2024 · USD 2024
- Median monthly gross rent
- $2,201
- ACS 2020–2024 · USD 2024
- Median age
- 38.9 years
- ACS 2020–2024
Period, uncertainty & data notes
More community indicators
- Residents aged 65+
- 16.3%
- ACS 2020–2024
- Households with housing cost burden
- 23.3%
- ACS 2017–2021
- Households without broadband
- 7.5%
- ACS 2017–2021
ACS five-year survey estimates; not live data. Each measure retains its own period and denominator. Income is in the final year’s inflation-adjusted US dollars. Missing is not zero.
Home values describe owner-occupied homes, not recent sale prices. Gross rent is monthly and includes applicable utilities; it is not advertised rent.
Selected fields; unavailable codes normalized to missing. No endorsement implied.
Margin of error: ± 1,164 USD
Source & license: U.S. Census Bureau / Census Reporter · ACS 2020–2024 · county · U.S. Census Bureau public data · Census Reporter republication
Successfully checked: · Content changed:
Margin of error: ± 3,891 USD
Source & license: U.S. Census Bureau / Census Reporter · ACS 2020–2024 · county · U.S. Census Bureau public data · Census Reporter republication
Successfully checked: · Content changed:
Margin of error: ± 17 USD
Source & license: U.S. Census Bureau / Census Reporter · ACS 2020–2024 · county · U.S. Census Bureau public data · Census Reporter republication
Successfully checked: · Content changed:
Margin of error: ± 0.2 years
Source & license: U.S. Census Bureau / Census Reporter · ACS 2020–2024 · county · U.S. Census Bureau public data · Census Reporter republication
Successfully checked: · Content changed:
Margin of error: Not supplied by this source; not zero
Source & license: U.S. Census Bureau / U.S. Environmental Protection Agency · ACS 2020–2024 · county · US EPA Data Licensing Agreement for public use
Successfully checked: · Content changed:
Margin of error: ± 0.5 percentage points
Source & license: U.S. Census Bureau / CDC · ACS 2017–2021 · county · Public · U.S. Census Bureau / CDC
Successfully checked: · Content changed:
Margin of error: ± 0.4 percentage points
Source & license: U.S. Census Bureau / CDC · ACS 2017–2021 · county · Public · U.S. Census Bureau / CDC
Successfully checked: · Content changed:
Map & location
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Dots summarize approximate ZIP locations grouped by state and three-digit prefix; they are not official delivery boundaries. Colors follow the first digit. Not every number in a displayed range is assigned. Alaska and island insets are relocated and use different scales.
Locations use available coordinates, not delivery boundaries. The simplified world outline may omit small islands; postal associations do not imply administrative ownership.
County outlines are simplified 2017 Census reference geography, not current legal or ZIP delivery boundaries. Highlighting follows postal associations.
No reliable coordinates are available for this postal region.
ZIP directory
Page 1 / 2Postal details & data notes
- ZIPs with coordinates
- 111
Common three-digit prefixes
Counts refer to this place; links explore the full prefix nationally. Endpoints do not imply every intervening ZIP exists. Postal names are not a count of incorporated municipalities.
ZIP codes organize mail delivery, not administrative boundaries. A code can have several city or county associations. Coordinates are approximate; verify delivery addresses with your carrier. Read the guide ↗