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Middlesex County, Massachusetts
What we have for Middlesex County today, and what is coming.
Basics
- County code (FIPS): 25017
- Land area: 818 square miles
- Population: 1,632,002
Federal money spent here
Fiscal year 2026: $29.2 billion in federal contracts, grants, loans and other awards for work done in Middlesex County.
Who represents Middlesex County
U.S. Senate (whole state): Edward J. Markey (Democrat), Elizabeth Warren (Democrat).
U.S. House districts that include part of this county
| District | Member | Share of county land |
|---|---|---|
| Congressional District 3 | Lori Trahan (Democrat) | 50% |
| Congressional District 5 | Katherine M. Clark (Democrat) | 25% |
| Congressional District 6 | Seth Moulton (Democrat) | 12.5% |
| Congressional District 2 | James P. McGovern (Democrat) | 7% |
| Congressional District 4 | Jake Auchincloss (Democrat) | 4.1% |
| Congressional District 7 | Ayanna Pressley (Democrat) | 1.3% |
State senate districts
| District | Member | Share of county land |
|---|---|---|
| Middlesex and Worcester District | not matched | 18.3% |
| Worcester and Middlesex District | not matched | 16.5% |
| Third Middlesex District | not matched | 15.4% |
| Middlesex and Norfolk District | not matched | 11.9% |
| First Middlesex District | not matched | 11% |
| Fourth Middlesex District | not matched | 8% |
| Second Essex and Middlesex District | not matched | 4.6% |
| Fifth Middlesex District | not matched | 4.4% |
| Norfolk and Middlesex District | not matched | 2.2% |
| Second Middlesex District | not matched | 2.1% |
| Norfolk-Worcester-Middlesex District | not matched | 1.9% |
| First Essex and Middlesex District | not matched | 1.6% |
| Suffolk and Middlesex District | not matched | 1.3% |
| Middlesex and Suffolk District | not matched | 0.8% |
State house / assembly districts
| District | Member | Share of county land |
|---|---|---|
| 1st Middlesex District | not matched | 14% |
| 8th Middlesex District | not matched | 7.4% |
| 13th Middlesex District | not matched | 7.3% |
| 37th Middlesex District | not matched | 7% |
| 2nd Middlesex District | not matched | 6.3% |
| 14th Middlesex District | not matched | 6.3% |
| 36th Middlesex District | not matched | 4.6% |
| 3rd Middlesex District | not matched | 4.2% |
| 19th Middlesex District | not matched | 3.3% |
| 21st Middlesex District | not matched | 3.3% |
| 22nd Middlesex District | not matched | 3.1% |
| 14th Norfolk District | not matched | 2.8% |
| 4th Middlesex District | not matched | 2.7% |
| 7th Middlesex District | not matched | 2.6% |
| 15th Middlesex District | not matched | 2.4% |
| 5th Middlesex District | not matched | 2.3% |
| 20th Middlesex District | not matched | 2.3% |
| 30th Middlesex District | not matched | 1.6% |
| 31st Middlesex District | not matched | 1.3% |
| 9th Middlesex District | not matched | 1.2% |
| 16th Middlesex District | not matched | 1.2% |
| 6th Middlesex District | not matched | 1.1% |
| 12th Middlesex District | not matched | 1.1% |
| 18th Essex District | not matched | 1% |
| 17th Middlesex District | not matched | 1% |
| 32nd Middlesex District | not matched | 1% |
| 11th Middlesex District | not matched | 0.9% |
| 24th Middlesex District | not matched | 0.8% |
| 35th Middlesex District | not matched | 0.7% |
| 9th Essex District | not matched | 0.6% |
| 10th Middlesex District | not matched | 0.6% |
| 23rd Middlesex District | not matched | 0.6% |
| 29th Middlesex District | not matched | 0.6% |
| 18th Middlesex District | not matched | 0.5% |
| 33rd Middlesex District | not matched | 0.4% |
| 34th Middlesex District | not matched | 0.4% |
| 26th Middlesex District | not matched | 0.3% |
| 28th Middlesex District | not matched | 0.3% |
| 25th Middlesex District | not matched | 0.2% |
| 27th Middlesex District | not matched | 0.2% |
| 2nd Suffolk District | not matched | 0.2% |
| 19th Worcester District | not matched | 0.2% |
| 11th Suffolk District | not matched | 0% |
| 18th Suffolk District | not matched | 0% |
Matched by district number using the U.S. Census Bureau 2020 county–district relationship files (land area overlap; districts may have been redrawn since). Your exact district depends on your address: U.S. House · state legislators.
County government
Find the official county website and contacts in the USA.gov local government directory or the National Association of Counties explorer.
Coming next for counties: county commission meetings and agendas, county budgets, local ballot measures and election results. We add each one as soon as a public, reliable feed exists for it. Know a good source? Tell us.
Sources: U.S. Census Bureau Gazetteer (county list, public domain); USAspending.gov (U.S. Treasury). Built 2026-11-03 15:28.