Janesville, IA Demographics

A map of Janesville's Population by Race

Janesville, Iowa has an estimated population of 917, a large decrease from the 1,034 recorded in the 2020 Census. The population is 97.4% White, 1.1% Asian, 0.8% Native American/Other, 0.4% Hispanic, 0.3% Multiracial, and 0.0% Black. This demographic dot map shows the population of Janesville, with one dot drawn for each person counted by the Census, color-coded by race.

Janesville has become 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 Janesville, that probability was 7.9% in 2020 and 5.1% in the most recent ACS estimates.

Janesville is ranked the 310th 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). Janesville was ranked the 275th most populous place in the 2020 Census.

Janesville's White Population

893 residents of Janesville, or 97.4% of the population, identify as White. The share of White residents in Janesville is significantly higher than in Iowa overall, where 82.3% of the population is White. Janesville ranks 190th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Janesville's White population has declined by an estimated 10.0%. White residents' share of Janesville's population has increased from 95.9% to 97.4%.

Janesville is more White than neighboring Waverly (89.3% White), Cedar Falls (90.6% White), Denver (94% White), Shell Rock (93.3% White), and New Hartford (96.1% White).

Janesville's Black Population

0 residents of Janesville, or 0.0% of the population, identify as Black. The share of Black residents in Janesville is slightly lower than in Iowa overall, where 3.8% of the population is Black. Janesville ranks 600th statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Janesville's Black population has grown from 0 to an estimated 0. Black residents' share of Janesville's population has remained roughly unchanged at 0.0%.

Janesville is less Black than neighboring Waverly (2.4% Black), Cedar Falls (1.4% Black), and Shell Rock (0.6% Black).

Janesville's Asian Population

10 residents of Janesville, or 1.1% of the population, identify as Asian. The share of Asian residents in Janesville is comparable to the share in Iowa overall, where 2.5% of the population is Asian. Janesville ranks 295th statewide in terms of Asian residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Janesville's Asian population has grown by an estimated 100.0%. Asian residents' share of Janesville's population has increased from 0.5% to 1.1%.

Janesville is more Asian than neighboring Shell Rock (0% Asian), and New Hartford (0.7% Asian). Janesville is less Asian than neighboring Waverly (1.5% Asian), Cedar Falls (3.2% Asian), and Denver (1.5% Asian).

Janesville's Hispanic Population

4 residents of Janesville, or 0.4% of the population, identify as Hispanic. The share of Hispanic residents in Janesville is lower than in Iowa overall, where 7.3% of the population is Hispanic. Janesville ranks 808th statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Janesville's Hispanic population has declined by an estimated 66.7%. Hispanic residents' share of Janesville's population has decreased from 1.2% to 0.4%.

Janesville is more Hispanic than neighboring New Hartford (0% Hispanic). Janesville is less Hispanic than neighboring Waverly (3.6% Hispanic), Cedar Falls (2.2% Hispanic), Denver (2.2% Hispanic), and Shell Rock (5.4% Hispanic).

Janesville's Native American/Other Population

7 residents of Janesville, or 0.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Janesville is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Janesville ranks 637th statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Janesville's Native American/Other population has grown from 0 to an estimated 7. Native American/Other residents' share of Janesville's population has increased from 0.0% to 0.8%.

Janesville is more Native American/Other than neighboring Waverly (0.1% Native American/Other), Cedar Falls (0.1% Native American/Other), Denver (0% Native American/Other), and Shell Rock (0% Native American/Other). Janesville is less Native American/Other than neighboring New Hartford (1% Native American/Other).

Janesville's Multiracial Population

3 residents of Janesville, or 0.3% of the population, identify as Multiracial. The share of Multiracial residents in Janesville is slightly lower than in Iowa overall, where 3.5% of the population is Multiracial. Janesville ranks 586th statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Janesville's Multiracial population has declined by an estimated 88.0%. Multiracial residents' share of Janesville's population has decreased from 2.4% to 0.3%.

Janesville is less Multiracial than neighboring Waverly (3.1% Multiracial), Cedar Falls (2.6% Multiracial), Denver (2.3% Multiracial), Shell Rock (0.7% Multiracial), and New Hartford (2.1% 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.