Castalian Springs is a community in Sumner County, Tennessee, home to about 678 people across 5.8 square miles. It has no ZIP code of its own: it’s part of 37031.
Homes sold for a median of $228 per square foot in the three months ending August 2026, a buyer’s market.
Part is in Castalian Springs, part in Hartsville/Trousdale County
Each card is that ZIP code’s whole market, including any part outside Castalian Springs. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Nashville International Airport (BNA)27 miles away |
|---|---|
| Nearest city of 250,000+ | Nashville-Davidson, TN30 miles away |
| Nearest city of 1 million+ | Chicago, IL384 miles away |
Straight-line distances from the center of Castalian Springs; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Castalian Springs had 608 residents in the 2020 census, up 9% since 2010.
It’s the 354th largest of 502 towns in Tennessee by population.
Sumner County grew from 26,072 residents in 1900 to 196,281 in 2020.
Sumner County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 25°F. About 54.9 inches of rain and melted snow fall in a typical year, with about 5 inches of snow.
Source: NOAA 1991–2020 climate normals, Bethpage 1 S, TN weather station (5 miles away).
56,402 jobs at 3,875 businesses in Sumner County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Museums (1 nearby)
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
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Shares ZIP codes with Hartsville/Trousdale County.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.