Plymouth County, Massachusetts: Diversifying Metro county. In 2024, voted D+9%. Republican peak: R+57 in 1896.
Key facts
- 2024 presidential margin
- D+9MIT Election Lab
- Political typology
- Diversifying MetroAkashic typology
- Population
- 535,0752024 5-year
- Median household income
- $114,2012024 5-year
- White (non-Hispanic)
- 77.0%2024 5-year
- Black
- 8.0%2024 5-year
- Hispanic / Latino
- 4.9%2024 5-year
- Peak Democratic margin
- D+37 in 1964MIT Election Lab
- Peak Republican margin
- R+57 in 1896MIT Election Lab
- Most similar
- Worcester County, MA · similarity 0.95
2024 results by precinct
2024 precinct map of Plymouth CountyPrecinct-level 2024 presidential results for Plymouth County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −17.4% |
| 1896 | −57.1% |
| 1900 | −34.5% |
| 1904 | −33.3% |
| 1908 | −37.4% |
| 1912 | +5.9% |
| 1916 | −9.7% |
| 1920 | −53.0% |
| 1924 | −51.4% |
| 1928 | −24.7% |
| 1932 | −17.6% |
| 1936 | −14.7% |
| 1940 | −16.9% |
| 1944 | −18.8% |
| 1948 | −16.6% |
| 1952 | −34.7% |
| 1956 | −42.6% |
| 1960 | −3.2% |
| 1964 | +36.6% |
| 1968 | +10.3% |
| 1972 | −4.7% |
| 1976 | +5.5% |
| 1980 | −15.5% |
| 1984 | −20.8% |
| 1988 | −10.9% |
| 1992 | +4.6% |
| 1996 | +21.4% |
| 2000 | +15.4% |
| 2004 | +8.4% |
| 2008 | +7.6% |
| 2012 | +4.2% |
| 2016 | +7.3% |
| 2020 | +17.2% |
| 2024 | +8.8% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 159,962 | 133,544 | 300,129 | ||
| D | 173,630 | 121,227 | 303,870 | ||
| D | 135,513 | 115,369 | 275,506 | ||
| D | 131,845 | 121,086 | 256,531 | ||
| D | 131,817 | 112,904 | 249,817 | ||
| D | 125,178 | 105,603 | 233,297 | ||
| D | 115,376 | 82,751 | 211,577 | ||
| D | 106,072 | 64,626 | 194,011 | ||
| D | 79,160 | 69,514 | 207,710 | ||
| R | 84,587 | 105,684 | 193,480 | ||
| R | 68,923 | 105,230 | 174,771 | ||
| R | 58,772 | 85,593 | 173,248 | ||
| D | 83,663 | 74,684 | 164,433 | ||
| R | 69,124 | 76,062 | 146,064 | ||
| D | 67,771 | 54,644 | 127,977 | ||
| D | 82,007 | 37,941 | 120,335 | ||
| R | 57,175 | 60,977 | 118,349 | ||
| R | 30,377 | 75,575 | 106,161 | ||
| R | 32,815 | 67,922 | 101,042 | ||
| R | 34,765 | 48,925 | 85,146 | ||
| R | 32,290 | 47,245 | 79,709 | ||
| R | 34,481 | 48,617 | 83,606 | ||
| R | 30,466 | 41,942 | 78,010 | ||
| R | 26,137 | 37,729 | 65,744 | ||
| R | 24,887 | 41,362 | 66,766 | ||
| R | 8,863 | 34,728 | 50,355 | ||
| R | 9,373 | 33,582 | 45,663 | ||
| R | 11,009 | 13,515 | 25,752 | ||
| O | 6,991 | 5,590 | 23,653 | ||
| R | 5,295 | 13,236 | 21,205 | ||
| R | 5,746 | 12,671 | 20,809 | ||
| R | 4,665 | 10,813 | 17,821 | ||
| R | 3,396 | 13,405 | 17,517 | ||
| R | 7,296 | 10,501 | 18,434 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
Irish
27.6%
Italian
13.1%
English
12.8%
German
5.3%
French
3.6%
American
3.6%
Scottish
2.5%
African American
6.4%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 43.0 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$114,201
Plymouth County ranks in the top 0.5% of US counties.
Plymouth County$114,201
Massachusetts$103,960
United States$80,734
Plymouth County ranks in the top 0.5% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
7.1%
Child poverty is below the national average.
Children under 187.5%
Working age (18–64)6.5%
Seniors (65+)11.9%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
85.3%
speak English only
Other Indo-European10.0%
Spanish3.1%
Asian & Pacific Islander1.0%
Other languages0.6%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 56.9% of residents not counted as adherents by any reporting body.
Plymouth County backed Republican presidential candidates for decades before trending Democratic in recent cycles; its 2024 D+8.8 margin reflects a steady suburban and exurban realignment along Massachusetts's South Shore.
The Democratic margin here reached thirty-seven points in 1964. Between 2020 and 2024 the county moved eight points toward the Republican candidate; the 2024 margin was nine points.
A population of 535,075, a 77% non-Hispanic-white share, and a median household income of $114,201 describe the county. The county's voting pattern over the last decade is most similar to that of Worcester County and Essex County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Plymouth County, Massachusetts. Akashic. https://akashic.app/county/25023/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More in Massachusetts
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Frequently asked questions
How did Plymouth County, Massachusetts vote in 2024?
In 2024, Plymouth County, Massachusetts voted Democratic by 8.8 points (D+9), carried by the Democratic candidate. Out of 300,129 votes cast, 159,962 went Democratic and 133,544 went Republican.
What is Plymouth County, Massachusetts's political typology?
Akashic places Plymouth County, Massachusetts in the "Diversifying Metro" typology — Mid-size metropolitan counties growing more diverse and trending Democratic. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 12 times, Republican 21 times, and other 1 times.
When did Plymouth County, Massachusetts last vote Republican?
The most recent presidential election in which Plymouth County, Massachusetts voted Republican was 1988.
How many people live in Plymouth County, Massachusetts?
Plymouth County, Massachusetts has a population of 535,075 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Plymouth County, Massachusetts?
Median household income in Plymouth County, Massachusetts is $114,201 — above the national median of $80,734. The Massachusetts state median is $103,960.
What is the political history of Plymouth County, Massachusetts?
Akashic tracks 38 presidential elections in Plymouth County, Massachusetts from 1876 to 2024. Of those, 12 went Democratic and 21 went Republican. The county's typology — "Diversifying Metro" — captures where that record, its demographics, and its recent swing place it among American communities.