Flat Rock vs Oblong

A side-by-side comparison of Flat Rock and Oblong: population, income, housing, and more.

Flat Rock and Oblong are places in Illinois. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Oblong has the higher population (1,617 vs 362 in Flat Rock). Oblong has the higher median household income ($52,702 vs $49,881 in Flat Rock). Oblong has the higher median home value ($78,400 vs $56,700 in Flat Rock).

Population, income & housing

	Flat Rock	Oblong
Population	362	1,617
Median age	37.7 yrs	34.8 yrs
Median household income	$49,881	$52,702
Median home value	$56,700	$78,400
Median gross rent	—	$532
Housing units	169	786
Homeownership rate	87.2%	65.4%
Bachelor's degree or higher	13.4%	9.5%
Unemployment rate	6.5%	4.8%

Trends (ACS 5-year, 2019–2023)

	Flat Rock	Oblong
Population	378 → 362 (-4.2%)	1,326 → 1,617 (+21.9%)
Median household income	$35,000 → $49,881 (+42.5%)	$41,005 → $52,702 (+28.5%)
Median home value	$55,300 → $56,700 (+2.5%)	$52,200 → $78,400 (+50.2%)
Median gross rent	$688 → $867 (+26.0%)	$503 → $532 (+5.8%)

Flat Rock

Population

378362

Median household income

$35,000$49,881

Median home value

$55,300$56,700

Median gross rent

$688$867

Oblong

Population

1,3261,617

Median household income

$41,005$52,702

Median home value

$52,200$78,400

Median gross rent

$503$532

Age & race/ethnicity

Age distribution (share)

	Flat Rock	Oblong
Under 5	7.7%	8.2%
5 to 17	13.8%	13.2%
18 to 24	10.5%	8.9%
25 to 34	16.0%	20.9%
35 to 44	7.2%	8.3%
45 to 54	10.8%	11.3%
55 to 64	16.9%	10.0%
65 to 74	4.4%	9.5%
75 and over	12.7%	9.8%

Race & ethnicity (share)

	Flat Rock	Oblong
White (non-Hispanic)	97.8%	92.8%
Black or African American	0.0%	1.2%
American Indian & Alaska Native	0.0%	0.1%
Asian	0.0%	0.0%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.0%
Two or more races	2.2%	5.5%
Hispanic or Latino	0.0%	0.4%

Educational attainment (age 25+)

Share of adults 25+

	Flat Rock	Oblong
No high school diploma	8.1%	10.6%
High school graduate	32.9%	38.2%
Some college or associate's	45.5%	41.8%
Bachelor's degree	11.0%	6.2%
Graduate or professional degree	2.4%	3.3%

Commute to work

How workers get to work (share)

	Flat Rock	Oblong
Drove alone	83.9%	88.4%
Carpooled	8.6%	5.6%
Public transit	0.0%	1.6%
Walked	1.1%	3.9%
Bicycle	0.0%	0.0%
Worked from home	5.7%	0.5%
Other means	0.6%	0.0%

Housing

Units in structure (share)

	Flat Rock	Oblong
1-unit, detached	85.8%	76.2%
1-unit, attached	0.0%	1.3%
2 to 4 units	0.0%	5.5%
5 to 19 units	0.0%	1.4%
20 or more units	0.0%	1.5%
Mobile home & other	14.2%	14.1%

Poverty & households

	Flat Rock	Oblong
Poverty rate	14.4%	22.2%
Average household size	2.45	2.18
Mean commute (minutes)	28	18
Median year structure built	1947	1964