Colwell vs Marble Rock

A side-by-side comparison of Colwell and Marble Rock: population, income, housing, and more.

Colwell and Marble Rock are places in Iowa. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Marble Rock has the higher population (199 vs 56 in Colwell). Marble Rock has the higher median household income ($65,938 vs $46,250 in Colwell). Colwell has the higher median home value ($103,100 vs $59,300 in Marble Rock).

Population, income & housing

	Colwell	Marble Rock
Population	56	199
Median age	32.5 yrs	55.1 yrs
Median household income	$46,250	$65,938
Median home value	$103,100	$59,300
Median gross rent	—	$592
Housing units	27	117
Homeownership rate	66.7%	74.7%
Bachelor's degree or higher	11.4%	3.3%
Unemployment rate	0.0%	5.2%

Trends (ACS 5-year, 2019–2023)

	Colwell	Marble Rock
Population	63 → 56 (-11.1%)	321 → 199 (-38.0%)
Median household income	$61,042 → $46,250 (-24.2%)	$51,875 → $65,938 (+27.1%)
Median home value	$93,300 → $103,100 (+10.5%)	$54,300 → $59,300 (+9.2%)
Median gross rent	—	$570 → $592 (+3.9%)

Colwell

Population

6356

Median household income

$61,042$46,250

Median home value

$93,300$103,100

Marble Rock

Population

321199

Median household income

$51,875$65,938

Median home value

$54,300$59,300

Median gross rent

$570$592

Age & race/ethnicity

Age distribution (share)

	Colwell	Marble Rock
Under 5	3.6%	1.0%
5 to 17	21.4%	12.6%
18 to 24	12.5%	9.5%
25 to 34	14.3%	7.5%
35 to 44	19.6%	6.0%
45 to 54	5.4%	13.1%
55 to 64	10.7%	19.6%
65 to 74	3.6%	23.1%
75 and over	8.9%	7.5%

Race & ethnicity (share)

	Colwell	Marble Rock
White (non-Hispanic)	96.4%	95.5%
Black or African American	0.0%	0.0%
American Indian & Alaska Native	0.0%	0.0%
Asian	0.0%	0.0%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.0%
Two or more races	3.6%	4.5%
Hispanic or Latino	0.0%	0.0%

Educational attainment (age 25+)

Share of adults 25+

	Colwell	Marble Rock
No high school diploma	5.7%	7.2%
High school graduate	40.0%	50.3%
Some college or associate's	42.9%	39.2%
Bachelor's degree	5.7%	2.6%
Graduate or professional degree	5.7%	0.7%

Commute to work

How workers get to work (share)

	Colwell	Marble Rock
Drove alone	78.1%	82.7%
Carpooled	0.0%	12.7%
Public transit	21.9%	0.0%
Walked	0.0%	3.6%
Bicycle	0.0%	0.0%
Worked from home	0.0%	0.9%
Other means	0.0%	0.0%

Housing

Units in structure (share)

	Colwell	Marble Rock
1-unit, detached	100.0%	88.9%
1-unit, attached	0.0%	0.0%
2 to 4 units	0.0%	0.9%
5 to 19 units	0.0%	8.5%
20 or more units	0.0%	0.0%
Mobile home & other	0.0%	1.7%

Poverty & households

	Colwell	Marble Rock
Poverty rate	35.7%	7.0%
Average household size	2.33	2.01
Mean commute (minutes)	23	32
Median year structure built	1938	1950