Plymouth County Population

1860–2026

25,710

2026 projection

0.1% since 2020 (increase)

05K10K15K20K25K30K186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Plymouth County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202625,710+130.05%
202525,697+130.05%
202425,684-390.15%
202325,723+100.04%
202225,713-310.12%
202125,744+470.18%
202025,697+4971.97%
201925,200+1760.70%
201825,024-290.12%
201725,053-1540.61%

Showing 10 of 31 years.

Plymouth County Demographics

41.3median age

Median age

Female41.9 yrs
Male40.3 yrs

Adults

19,304
5,096 seniors (65+) · 26% of adults14,208 other adults

Sex

Female 49.1% · 12,632Male 50.9% · 13,115

Population by age

MaleFemale85+ years, male: 17085+ years, female: 44980–84 years, male: 36080–84 years, female: 34775–79 years, male: 38775–79 years, female: 43370–74 years, male: 59170–74 years, female: 61465–69 years, male: 85765–69 years, female: 88860–64 years, male: 1,05760–64 years, female: 86655–59 years, male: 72155–59 years, female: 80450–54 years, male: 85950–54 years, female: 69845–49 years, male: 80345–49 years, female: 66540–44 years, male: 79340–44 years, female: 82135–39 years, male: 74035–39 years, female: 75030–34 years, male: 71130–34 years, female: 81425–29 years, male: 68525–29 years, female: 62320–24 years, male: 71420–24 years, female: 59615–19 years, male: 96215–19 years, female: 75210–14 years, male: 76310–14 years, female: 1,1135–9 years, male: 1,1205–9 years, female: 7060–4 years, male: 8220–4 years, female: 69385+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 257 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Plymouth County Income

$83,251median household income

Median household income

$83,251

Half of households earn more, half earn less

Median earnings

$51,815

Typical yearly pay for a worker 25 or older.

Poverty rate

6.9%

About 1 in 14 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Plymouth County Marital Status

59% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married59%60%59%
Never married26%29%22%
Divorced8%8%9%
Widowed6%3%10%
Separated<1%<1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year