Rock Falls, IL Profile: Facts & Data


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Rock Falls, Illinois - Basic Facts

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The City of Rock Falls had a population of 8,879 as of July 1, 2021. Rock Falls ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Rock Falls is located at latitude 41.7798 and longitude -89.689 in Whiteside County. The formal boundaries for the City of Rock Falls encompass a land area of 3.72 sq. miles and a water area of 0.14 sq. miles. Whiteside County is in the Central time zone (GMT -6). The elevation is 643 feet.

The City of Rock Falls 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 Falls is located within Township of Coloma, a minor civil division (MCD) of Whiteside County.

Alternate Unofficial Names for Rock Falls: Rockfalls.

Jump to... (On This Page!)
  1. Rock Falls 2021 Demographic Data
  2. Growth Rates for Rock Falls (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2021 Demographics

Rock Falls, IL Data & Demographics (As of July 1, 2021)


Total Population 8,879 (100%)
Population in Households 8,820 (99.3%)
Population in Families 6,749 (76.0%)
Population in Group Quarters1 59 ( 0.7%)
Population Density 2,229
Diversity Index2 41


Median Household Income $47,440
Average Household Income $58,630
% of Income for Mortgage4 7%
Per Capita Income $24,997
Wealth Index5 50


Total HU (Housing Units) 4,169 (100%)
Owner Occupied HU 2,382 (57.1%)
Renter Occupied HU 1,364 (32.7%)
Vacant Housing Units 423 (10.1%)
Median Home Value $78,726
Average Home Value $93,592
Housing Affordability Index3 277


Total Households 3,746
Average Household Size 2.35
Family Households 2,274
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 -0.48% -0.69%
Households -0.29% -0.56%
Families -0.56% -0.68%
Median Household Income   1.27%
Per Capita Income   1.75%
Owner Occupied HU   -0.23%

Rock Falls, IL - Peer Comparisons by Rank and Percentile

The table below compares Rock Falls to the other 1,369 incorporated cities, towns and CDPs in Illinois 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 # 240 83rd
Population Density # 214 84th
Median Household Income # 1138 17th
Housing Affordability Index # 986 72nd
Per Capita Income # 1126 18th
Diversity Index # 260 81st

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

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