Castalian Springs, Tennessee Demographics & Population 2026

A note before these figures: with a population of 678, Castalian Springs's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Castalian Springs is a small community located in Tennessee, within Sumner County. The total population is 678. It ranks as the 354th most populous out of 502 Census-designated places in Tennessee.

Age Demographics

The median age in Castalian Springs is 44.1 years. This is 13% higher than the state median of 38.9 years. 11.7% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Castalian Springs is $57,917. This is 17% lower than the state median of $69,595. It is also 28% lower than the national median of $80,734. The poverty rate stands at 9.3%. This is 32% lower than the state poverty rate of 13.8%. The survey records no unemployed residents in Castalian Springs, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $283,100. Housing costs are 1% lower than the state median of $286,700. The home-value-to-income ratio is 4.9x. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 49% higher than the state average of 66.9%.

Race & Ethnicity

Castalian Springs has a predominantly White (non-Hispanic) population, comprising 88.8% of all residents. Black or African American residents account for 6.2%. The Black or African American population (6.2%) is well below the state average of 15.4%.

Education

30.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 3% lower than the state rate of 31.1%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 88.6%.

Data Sources & Methodology

All demographic data for Castalian Springs, Tennessee is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Tennessee state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 502 Census-designated places in Tennessee. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.