Skip to main content

Area data

Castalian Spring, TN — ZIP 37031

Population: 3,926 (Census ACS)

The typical home value in ZIP 37031 (Castalian Spring, TN) is $426,303 — up 3.6% over the past year. Homes sell for a median $560,000 after a median 111 days on market. FEMA's National Risk Index rates the county's overall natural-hazard risk Relatively Moderate, with cold wave, ice storm, lightning the top-rated hazards. Cost of living is 8.1% below the US average (BEA, metro/state-level).

Backed by 25+ public sourcesFEMA · U.S. Census · NOAA · Dept. of Education · EPA · and more

$426,303

Typical home value

+3.6%

1-year change

111

Median days on market

Relatively Moderate

Hazard risk (county)

Home values & appreciation

Typical home value
$426,303
1-year appreciation
+3.6%
3-year appreciation
+11.8%
5-year appreciation
+32.7%
10-year appreciation
+134.9%
Peak value since 2000 (May 2026)
$426,420
House Price Index (state)
484.9 (+0.8% YoY)

Sources: home value index (ZIP-level) · FHFA House Price Index (state-level)

Market activity

Median sale price
$560,000
Median list price
$519,000
Median price per sqft
$228
1-year sale-price change
+5.7%
Median days on market
111 days
Homes sold (recent period)
11
For-sale inventory
24
Sale-to-list ratio
98.2%
Active listings
21
1-year forecast
+0.2%
New listings (monthly)
6

Source: recent area sales and market data (ZIP-level)

Rents

Studio fair-market rent
$1,585/mo
1BR fair-market rent
$1,650/mo
2BR fair-market rent
$1,798/mo
3BR fair-market rent
$2,309/mo
4BR fair-market rent
$2,799/mo

Sources: market rent index (ZIP-level) · HUD Fair Market Rents (metro/county-level, 40th-percentile regulatory reference)

Affordability

Cost of living index (Below Average)
91.9 (100 = US avg)
Electricity rate (state-level)
13.2¢/kWh
Natural gas rate (state-level)
$11.80/MCF
30-year mortgage rate (national)
7.40%
15-year mortgage rate (national)
6.73%

Sources: BEA Regional Price Parities (metro/state-level) · EIA energy rates (state-level) · Freddie Mac PMMS (national)

Natural hazards & flood risk

Overall hazard risk (county)
Relatively Moderate
Top hazards (county)
cold wave, ice storm, lightning, strong wind, tornado
Notable hazard ratings (county)
tornado: Relatively High · cold wave: Relatively High · ice storm: Relatively High · lightning: Relatively High · strong wind: Relatively High · winter weather: Relatively High
Most common flood zone among NFIP claims
Zone AE
NFIP flood claims on record
23
Wildfire risk to homes (county)
Higher than 15% of US counties
Buildings in wildfire direct-exposure zone
66.1%
Radon potential (county)
Moderate radon potential — EPA Zone 2 of 3
EPA Superfund (NPL) sites within 5 mi
None
Flood zones vary by property. Look up a specific address on the FEMA Flood Map Service Center.
EPA recommends radon testing for every home regardless of zone.

Sources: FEMA National Risk Index (county-level) · FEMA NFIP flood-insurance claims (ZIP-level) · USDA Forest Service Wildfire Risk to Communities (county-level) · EPA radon zones + Superfund NPL

Climate (30-year normals)

Average annual temperature
62.0°F
Average high
71.0°F
Average low
52.0°F
Annual precipitation
59.0 in
Annual snowfall
0.3 in
USDA plant hardiness zone
7b (extreme annual low 5 to 10°F)

Sources: NOAA Climate Normals (30-year, nearest-station) · USDA Plant Hardiness Zone Map (2023)

Air quality

Air quality rating
Good
Median AQI (annual)
44
Days with Good air quality
248
Days with Moderate air quality
109
Highest AQI recorded (year)
119

Source: EPA annual air quality index (county-level)

Walkability & transit

Walkability index
6.8 / 20
Transit service frequency
-99,999
Jobs reachable by car (30 min)
5,242
Jobs reachable by transit (45 min)
7,289

Source: EPA Smart Location Database (metropolitan block groups)

Amenities

National parks within ~60 mi
2
Nearest national park
Stones River National Battlefield (35 mi)
National parks include
Stones River National Battlefield, Mammoth Cave National Park
Airports within 30 mi
18
Nearest airport
Music City Executive Airport (7 mi)
Nearest major airport
Nashville International Airport (BNA) (27 mi)
Hospitals in or near this ZIP
33
Hospitals include
T J SAMSON COMMUNITY HOSPITAL, The Medical Center at Russellville, MONROE COUNTY MEDICAL CENTER
Avg hospital rating (CMS)
3.4 / 5
Best hospital rating nearby (CMS)
5.0 / 5
Solar radiation rating
Fair (4.2 kWh/m²/day)

Sources: National Park Service · FAA airport data · CMS hospital data (same ZIP, else within ~40 mi) · DOE/NREL (proximity-based)

Migration

Net migration (county)
+1,741 tax filers

Source: IRS SOI county-to-county migration (county-level; published with a multi-year lag)

Housing stock

Median year housing built
2001
Housing built before 1970
11.8%
Housing built 2000 or later
52.6%
Median annual property tax
$1,340
Mean commute to work
26 min
Households with broadband internet
64.0%

Source: Census ACS 5-year estimates (ZIP-level)

Employment & development

Total county employment
54,222
Average weekly wage
$1,187
Top industries (by employment)
Health Care, Accommodation & Food, Construction
Annual residential building permits (county)
3,045

Sources: BLS QCEW (county-level) · Census Building Permits (county-level)

How it compares

ZIP 37031State medianUS median
Typical home value$426,303$269,266$288,527
Median sale price$560,000$315,000$325,000
Median days on market111 days73 days51 days
Median annual property tax$1,340$970$2,006

State and US medians are computed across all US ZIP codes with sufficient public-data coverage, from the same sources as the figures above.

Area data compiled from public government, academic, and industry research feeds. Data sources →

Common questions

What is the typical home value in ZIP 37031?
$426,303.
What is the median sale price in ZIP 37031?
$560,000.
How long do homes take to sell in ZIP 37031?
Median days on market: 111 days.
What is typical rent in ZIP 37031?
2-bedroom fair-market rent: $1,798/month (HUD FMR — a 40th-percentile regulatory reference, not market-observed).
What is the natural-hazard risk in ZIP 37031?
Overall risk: Relatively Moderate (FEMA NRI, county-level). Top hazards: cold wave, ice storm, lightning, strong wind, tornado.
Is ZIP 37031 in a flood zone?
Flood zones vary by property within ZIP 37031. 23 FEMA flood-insurance (NFIP) claims are on record; the most common zone among them is AE. Check a specific address on the FEMA Flood Map Service Center.
What is the wildfire risk in ZIP 37031?
Risk to homes is higher than 15% of US counties (USDA Forest Service Wildfire Risk to Communities, county-level).
What is the radon potential in ZIP 37031?
Moderate radon potential — EPA Zone 2 of 3, county-level. EPA recommends testing every home regardless of zone.
Are there Superfund sites near ZIP 37031?
No current or proposed National Priorities List sites within 5 miles (EPA).
Is ZIP 37031 walkable?
Walkability index: 6.8/20 (EPA Smart Location Database).
What is the air quality in ZIP 37031?
Good. Median AQI: 44. (EPA AQI).
What is the cost of living in ZIP 37031?
Regional Price Parity: 91.9 (100 = US average) (Below Average) (BEA RPP, metro/state-level).

Nearby ZIP codes

Listing a home in Castalian Spring, TN?

REAIGENT7 gives every listing its own AI assistant grounded in this same public data — it answers buyer and renter questions about the home and the area, around the clock, and sends every lead to the listing agent. Agents: it installs on your listing page, your website, or WordPress.

Data last updated

Most recent source refresh: Oct 2026. See all data sources →

Data compiled by REAIGENT7 — AI listing platform for real estate agents