Onslow, IA Profile: Facts & Data


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Onslow, Iowa - Basic Facts

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The City of Onslow had a population of 203 as of July 1, 2021.

The primary coordinate point for Onslow is located at latitude 42.107 and longitude -91.0151 in Jones County. The formal boundaries for the City of Onslow encompass a land area of 0.22 sq. miles and a water area of 0 sq. miles. Jones County is in the Central time zone (GMT -6). The elevation is 925 feet.

The City of Onslow has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Onslow is located within Township of Madison, a minor civil division (MCD) of Jones County.

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  1. Onslow 2021 Demographic Data
  2. Growth Rates for Onslow (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Iowa Research Tools (Easy Tools & Current Data)
  3. Iowa Data Comparison Tool - 2021 Demographics

Onslow, IA Data & Demographics (As of July 1, 2021)


Total Population 203 (100%)
Population in Households 203 (100.0%)
Population in Families 167 (82.3%)
Population in Group Quarters1 0
Population Density 901
Diversity Index2 10


Median Household Income $55,994
Average Household Income $70,312
% of Income for Mortgage4 10%
Per Capita Income $30,490
Wealth Index5 64


Total HU (Housing Units) 112 (100%)
Owner Occupied HU 72 (64.3%)
Renter Occupied HU 26 (23.2%)
Vacant Housing Units 14 (12.5%)
Median Home Value $135,938
Average Home Value $173,944
Housing Affordability Index3 254


Total Households 98
Average Household Size 2.07
Family Households 67
Average Family Size 2
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population 0.27% 0.1%
Households 0.37% 0.2%
Families 2.28% 0.0%
Median Household Income   2.76%
Per Capita Income   2.55%
Owner Occupied HU   0.55%

Onslow, IA - Peer Comparisons by Rank and Percentile

The table below compares Onslow to the other 1,008 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2021 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 695 31st
Population Density # 353 65th
Median Household Income # 619 39th
Housing Affordability Index # 664 66th
Per Capita Income # 534 47th
Diversity Index # 558 45th

Additional comparisons and rankings can be made with a VERY EASY TO USE Iowa Census Data Comparison Tool.

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