Linn County Demographics

A map of Linn County's Population by Race

Linn County, Iowa has an estimated population of 230,004, a less than 1% change from the 230,299 recorded in the 2020 Census. The population is 82.4% White, 5.9% Black, 4.7% Multiracial, 4.1% Hispanic, 2.4% Asian, and 0.5% Native American/Other. This demographic dot map shows the population of Linn County, with one dot drawn for each person counted by the Census, color-coded by race.

Linn has become less racially diverse since the 2020 Census. It is about as diverse as Iowa overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Linn County, that probability was 32.5% in 2020 and 31.4% in the most recent ACS estimates.

Linn County is ranked the 2nd most populous county in Iowa, out of 99 counties. Linn County was ranked the 2nd most populous county in the 2020 Census.

Linn County's White Population

189,409 residents of Linn County, or 82.4% of the population, identify as White. The share of White residents in Linn County is comparable to the share in Iowa overall, where 82.3% of the population is White. Linn County ranks 83rd statewide in terms of White residents as a share of the population, out of 99 counties.

Since the 2020 Census, Linn County's White population has remained roughly the same. White residents' share of Linn County's population has increased from 81.6% to 82.4%.

Linn County is more White than neighboring Johnson County (74.8% White). Linn County is less White than neighboring Delaware County (94.1% White), Buchanan County (95% White), Benton County (94.4% White), and Jones County (91.5% White).

Linn County's Black Population

13,514 residents of Linn County, or 5.9% of the population, identify as Black. The share of Black residents in Linn County is slightly higher than in Iowa overall, where 3.8% of the population is Black. Linn County ranks 5th statewide in terms of Black residents as a share of the population, out of 99 counties.

Since the 2020 Census, Linn County's Black population has declined by an estimated 16.6%. Black residents' share of Linn County's population has decreased from 7.0% to 5.9%.

Linn County is more Black than neighboring Delaware County (0.1% Black), Buchanan County (0.6% Black), Benton County (0.4% Black), and Jones County (2.5% Black). Linn County is less Black than neighboring Johnson County (7.6% Black).

Linn County's Asian Population

5,489 residents of Linn County, or 2.4% of the population, identify as Asian. The share of Asian residents in Linn County is comparable to the share in Iowa overall, where 2.5% of the population is Asian. Linn County ranks 12th statewide in terms of Asian residents as a share of the population, out of 99 counties.

Since the 2020 Census, Linn County's Asian population has grown by an estimated 2.7%. Asian residents' share of Linn County's population has remained roughly unchanged at 2.4%.

Linn County is more Asian than neighboring Delaware County (0% Asian), Buchanan County (0.2% Asian), Benton County (0.2% Asian), and Jones County (0.6% Asian). Linn County is less Asian than neighboring Johnson County (5.6% Asian).

Linn County's Hispanic Population

9,482 residents of Linn County, or 4.1% of the population, identify as Hispanic. The share of Hispanic residents in Linn County is slightly lower than in Iowa overall, where 7.3% of the population is Hispanic. Linn County ranks 41st statewide in terms of Hispanic residents as a share of the population, out of 99 counties.

Since the 2020 Census, Linn County's Hispanic population has grown by an estimated 6.4%. Hispanic residents' share of Linn County's population has remained roughly unchanged at 4.1%.

Linn County is more Hispanic than neighboring Delaware County (1.7% Hispanic), Buchanan County (1.9% Hispanic), Benton County (2% Hispanic), and Jones County (2.6% Hispanic). Linn County is less Hispanic than neighboring Johnson County (6.7% Hispanic).

Linn County's Native American/Other Population

1,209 residents of Linn County, or 0.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Linn County is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Linn County ranks 21st statewide in terms of Native American/Other residents as a share of the population, out of 99 counties.

Since the 2020 Census, Linn County's Native American/Other population has declined by an estimated 22.6%. Native American/Other residents' share of Linn County's population has remained roughly unchanged at 0.5%.

Linn County is more Native American/Other than neighboring Buchanan County (0.1% Native American/Other), Benton County (0.2% Native American/Other), and Jones County (0.1% Native American/Other). Linn County is less Native American/Other than neighboring Johnson County (0.6% Native American/Other).

Linn County's Multiracial Population

10,901 residents of Linn County, or 4.7% of the population, identify as Multiracial. The share of Multiracial residents in Linn County is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. Linn County ranks 4th statewide in terms of Multiracial residents as a share of the population, out of 99 counties.

Since the 2020 Census, Linn County's Multiracial population has grown by an estimated 5.1%. Multiracial residents' share of Linn County's population has remained roughly unchanged at 4.7%.

Linn County is more Multiracial than neighboring Johnson County (4.6% Multiracial), Delaware County (3.7% Multiracial), Buchanan County (2.2% Multiracial), Benton County (2.8% Multiracial), and Jones County (2.7% 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.