Plymouth, IA Demographics

A map of Plymouth's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	395	340	97.1%	90.7%
Multiracial	5	18	1.2%	4.8%
Black	3	5	0.7%	1.3%
Hispanic	3	9	0.7%	2.4%
Asian	1	0	0.2%	0.0%
Native American/Other	0	3	0.0%	0.8%

Plymouth, Iowa has an estimated population of 407, an increase from the 375 recorded in the 2020 Census. The population is 97.1% White, 1.2% Multiracial, 0.7% Black, 0.7% Hispanic, 0.2% Asian, and 0.0% Native American/Other. This demographic dot map shows the population of Plymouth, with one dot drawn for each person counted by the Census, color-coded by race.

Plymouth has become considerably less racially diverse since the 2020 Census. It is considerably less diverse than Iowa overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Plymouth, that probability was 17.5% in 2020 and 5.8% in the most recent ACS estimates.

Plymouth is ranked the 522nd most populous place in Iowa, out of 1,026 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Plymouth was ranked the 526th most populous place in the 2020 Census.

Plymouth's White Population

395 residents of Plymouth, or 97.1% of the population, identify as White. The share of White residents in Plymouth is considerably higher than in Iowa overall, where 82.3% of the population is White. Plymouth ranks 697th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Plymouth's White population has grown by an estimated 16.2%. White residents' share of Plymouth's population has increased from 90.7% to 97.1%.

Plymouth is more White than neighboring Manly (83% White), Grafton (95.2% White), and Mason City (84.9% White). Plymouth is less White than neighboring Rock Falls (100% White), and Portland (100% White).

Plymouth's Black Population

3 residents of Plymouth, or 0.7% of the population, identify as Black. The share of Black residents in Plymouth is slightly lower than in Iowa overall, where 3.8% of the population is Black. Plymouth ranks 155th statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Plymouth's Black population has declined by an estimated 40.0%. Black residents' share of Plymouth's population has decreased from 1.3% to 0.7%.

Plymouth is more Black than neighboring Rock Falls (0% Black), and Portland (0% Black). Plymouth is less Black than neighboring Manly (2.9% Black), Grafton (1.5% Black), and Mason City (2.9% Black).

Plymouth's Asian Population

1 residents of Plymouth, or 0.2% of the population, identify as Asian. The share of Asian residents in Plymouth is slightly lower than in Iowa overall, where 2.5% of the population is Asian. Plymouth ranks 543rd statewide in terms of Asian residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Plymouth's Asian population has grown from 0 to an estimated 1. Asian residents' share of Plymouth's population has remained roughly unchanged at 0.2%.

Plymouth is more Asian than neighboring Rock Falls (0% Asian), Manly (0% Asian), Grafton (0% Asian), and Portland (0% Asian). Plymouth is less Asian than neighboring Mason City (1.3% Asian).

Plymouth's Hispanic Population

3 residents of Plymouth, or 0.7% of the population, identify as Hispanic. The share of Hispanic residents in Plymouth is lower than in Iowa overall, where 7.3% of the population is Hispanic. Plymouth ranks 539th statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Plymouth's Hispanic population has declined by an estimated 66.7%. Hispanic residents' share of Plymouth's population has decreased from 2.4% to 0.7%.

Plymouth is more Hispanic than neighboring Rock Falls (0% Hispanic), and Portland (0% Hispanic). Plymouth is less Hispanic than neighboring Manly (8.3% Hispanic), Grafton (3.3% Hispanic), and Mason City (7% Hispanic).

Plymouth's Native American/Other Population

0 residents of Plymouth, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Plymouth is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Plymouth ranks 182nd statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Plymouth's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Plymouth's population has decreased from 0.8% to 0.0%.

Plymouth is less Native American/Other than neighboring Mason City (1.3% Native American/Other).

Plymouth's Multiracial Population

5 residents of Plymouth, or 1.2% of the population, identify as Multiracial. The share of Multiracial residents in Plymouth is slightly lower than in Iowa overall, where 3.5% of the population is Multiracial. Plymouth ranks 133rd statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Plymouth's Multiracial population has declined by an estimated 72.2%. Multiracial residents' share of Plymouth's population has decreased from 4.8% to 1.2%.

Plymouth is more Multiracial than neighboring Rock Falls (0% Multiracial), Grafton (0% Multiracial), and Portland (0% Multiracial). Plymouth is less Multiracial than neighboring Manly (5.8% Multiracial), and Mason City (2.6% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.