Rock Falls, IL Profile: Facts, Map & Data


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Rock Falls, Illinois - Basic Facts

The City of Rock Falls had a population of 9,313 as of July 1, 2017. 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 41.773 and longitude -89.6945 in Whiteside County. The formal boundaries for the City of Rock Falls (see map below) 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 646 feet.

The City of Rock Falls (GNIS ID: 2396397) 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.

Beneath the boundary map are tables with Rock Falls population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Rock Falls: Rockfalls.

Neighborhood Data

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City of Rock Falls, IL Boundary Map

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Boundary Maps: Township of Coloma | Whiteside County | Illinois Counties

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Rock Falls, IL Data & Demographics (As of July 1, 2017)


Total Population 9,313
Daytime Population: Workers 3,510
Daytime Population: Residents 5,354
Total Daytime Population (TDP) 8,864
Ratio TDP/Total Population1 0.95
Population in Households 9,253
Population in Familes 7,140
Population in Group Qrtrs 60
Population Density2 2,505
Diversity Index3 40


Median Household Income $36,671
Average Household Income $46,219
Per Capita Income $19,579


Total Housing Units 4,226 (100%)
Owner Occupied HU 2,347 (55.5%)
Renter Occupied HU 1,528 (36.2%)
Vacant Housing Units 350 ( 8.3%)
Median Home Value $80,697
Average Home Value $95,347


Total Households 3,876
Average Household Size 2.39
Family Households 2,383
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. 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 race 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.


2010-2017 2017-2022
Population -0.13% -0.29%
Households -0.01% -0.23%
Families -0.26% -0.36%
Median Household Income   0.62%
Per Capita Income   2.09%

Rock Falls, IL - Peer Comparisons by Rank and Percentile

The table below compares Rock Falls to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 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 # 235 83rd
Population Density # 181 87th
Diversity Index # 247 82nd
Median Household Income # 1283 6th
Per Capita Income # 1286 6th

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

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