Rock Valley, IA Profile: Facts & Data


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Rock Valley, Iowa - Basic Facts

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The City of Rock Valley had a population of 3,589 as of July 1, 2021. Rock Valley ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Iowa. See peer rankings below.

The primary coordinate point for Rock Valley is located at latitude 43.2053 and longitude -96.295 in Sioux County. The formal boundaries for the City of Rock Valley encompass a land area of 3.24 sq. miles and a water area of 0.05 sq. miles. Sioux County is in the Central time zone (GMT -6). The elevation is 1,247 feet.

The City of Rock Valley 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 Rock Valley is located within Township of Rock, a minor civil division (MCD) of Sioux County.

Jump to... (On This Page!)
  1. Rock Valley 2021 Demographic Data
  2. Growth Rates for Rock Valley (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

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


Total Population 3,589 (100%)
Population in Households 3,506 (97.7%)
Population in Families 2,930 (81.6%)
Population in Group Quarters1 83 ( 2.3%)
Population Density 824
Diversity Index2 41


Median Household Income $64,644
Average Household Income $82,603
% of Income for Mortgage4 11%
Per Capita Income $31,639
Wealth Index5 83


Total HU (Housing Units) 1,473 (100%)
Owner Occupied HU 1,087 (73.8%)
Renter Occupied HU 288 (19.6%)
Vacant Housing Units 98 ( 6.7%)
Median Home Value $164,632
Average Home Value $189,121
Housing Affordability Index3 216


Total Households 1,375
Average Household Size 2.55
Family Households 920
Average Family Size 3
  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 0.49% 0.56%
Households 0.52% 0.62%
Families 0.38% 0.52%
Median Household Income   1.16%
Per Capita Income   1.83%
Owner Occupied HU   0.85%

Rock Valley, IA - Peer Comparisons by Rank and Percentile

The table below compares Rock Valley 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 # 110 89th
Population Density # 398 61st
Median Household Income # 366 64th
Housing Affordability Index # 462 46th
Per Capita Income # 448 56th
Diversity Index # 46 96th

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

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