Castalian Springs vs Shackle Island

A side-by-side comparison of Castalian Springs and Shackle Island: population, income, housing, and more.

Castalian Springs and Shackle Island are places in Tennessee. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Shackle Island has the higher population (4,164 vs 648 in Castalian Springs). Shackle Island has the higher median household income ($131,944 vs $86,071 in Castalian Springs). Shackle Island has the higher median home value ($467,500 vs $250,000 in Castalian Springs).

Population, income & housing

	Castalian Springs	Shackle Island
Population	648	4,164
Median age	45.0 yrs	47.1 yrs
Median household income	$86,071	$131,944
Median home value	$250,000	$467,500
Housing units	277	1,470
Homeownership rate	100.0%	92.8%
Bachelor's degree or higher	33.5%	40.0%
Unemployment rate	0.0%	6.8%

Trends (ACS 5-year, 2019–2023)

	Castalian Springs	Shackle Island
Population	428 → 648 (+51.4%)	3,112 → 4,164 (+33.8%)
Median household income	$59,276 → $86,071 (+45.2%)	$112,857 → $131,944 (+16.9%)
Median home value	$120,000 → $250,000 (+108.3%)	$313,400 → $467,500 (+49.2%)

Castalian Springs

Population

428648

Median household income

$59,276$86,071

Median home value

$120,000$250,000

Shackle Island

Population

3,1124,164

Median household income

$112,857$131,944

Median home value

$313,400$467,500

Age & race/ethnicity

Age distribution (share)

	Castalian Springs	Shackle Island
Under 5	4.6%	1.9%
5 to 17	17.1%	16.7%
18 to 24	6.0%	7.2%
25 to 34	10.8%	6.9%
35 to 44	11.4%	14.2%
45 to 54	22.1%	24.1%
55 to 64	9.0%	15.3%
65 to 74	10.2%	6.7%
75 and over	8.8%	7.1%

Race & ethnicity (share)

	Castalian Springs	Shackle Island
White (non-Hispanic)	92.3%	87.1%
Black or African American	0.0%	5.7%
American Indian & Alaska Native	0.0%	0.3%
Asian	1.4%	0.0%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.5%
Two or more races	6.3%	1.2%
Hispanic or Latino	0.0%	5.1%

Educational attainment (age 25+)

Share of adults 25+

	Castalian Springs	Shackle Island
No high school diploma	9.8%	4.4%
High school graduate	30.6%	23.2%
Some college or associate's	26.1%	32.4%
Bachelor's degree	17.7%	22.4%
Graduate or professional degree	15.8%	17.5%

Commute to work

How workers get to work (share)

	Castalian Springs	Shackle Island
Drove alone	89.9%	76.9%
Carpooled	0.0%	4.2%
Public transit	0.0%	0.0%
Walked	0.0%	0.0%
Bicycle	0.0%	0.0%
Worked from home	10.1%	17.4%
Other means	0.0%	1.4%

Housing

Units in structure (share)

	Castalian Springs	Shackle Island
1-unit, detached	96.0%	99.7%
1-unit, attached	0.0%	0.0%
2 to 4 units	0.0%	0.0%
5 to 19 units	0.0%	0.0%
20 or more units	0.0%	0.0%
Mobile home & other	4.0%	0.3%

Poverty & households

	Castalian Springs	Shackle Island
Poverty rate	7.3%	7.8%
Average household size	2.42	2.83
Mean commute (minutes)	25	39
Median year structure built	1987	1991