Rock City, IL Profile: Facts, Map & Data


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Rock City, Illinois - Basic Facts

The Village of Rock City had a population of 306 as of July 1, 2016. Rock City ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Rock City is located at latitude 42.4132 and longitude -89.4709 in Stephenson County. The formal boundaries for the Village of Rock City (see map below) encompass a land area of 0.15 sq. miles and a water area of 0 sq. miles. Stephenson County is in the Central time zone (GMT -6). The elevation is 909 feet.

The Village of Rock City (GNIS ID: 2399101) 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 Village of Rock City is located within Township of Rock Run, a minor civil division (MCD) of Stephenson County.

Beneath the boundary map are tables with Rock City population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Alternate Unofficial Names for Rock City: Rock Run.

Neighborhood Data

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Village of Rock City, IL Boundary Map

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Boundary Maps: Township of Rock Run | Stephenson County | Illinois Counties

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Rock City, IL Data & Demographics (As of July 1, 2016)


Total Population 306
Population in Households 306
Population in Familes 273
Population in Group Qrtrs 0
Population Density1 2,005
Diversity Index2 13


Total Households 121
Average Household Size 2.53
Family Households 95
Average Family Size 3


Total Housing Units 128 (100%)
Owner Occupied HU 105 (82.0%)
Renter Occupied HU 16 (12.5%)
Vacant Housing Units 7 ( 5.5%)
Median Home Value $145,833
Average Home Value $176,442


Median Household Income $55,750
Average Household Income $73,856
Per Capita Income $28,686
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.46% -0.53%
Households -0.26% -0.5%
Families 0.87% -0.42%
Median Household Income   1.84%
Per Capita Income   2.44%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Rock City, IL - Peer Comparisons by Rank and Percentile

The table below compares Rock City to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2016 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 # 1090 20th
Population Density1 # 275 80th
Diversity Index2 # 664 52nd
Median Household Income # 540 61st
Per Capita Income # 446 67th

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

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