Byrnes Mill is a city in Jefferson County, Missouri, home to about 3,189 people across 5.1 square miles. It has no ZIP code of its own: it’s part of 63025 and 63051.
Homes sold for a median of $177 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Eureka; part is in Byrnes Mill
Part is in Byrnes Mill, part in LaBarque Creek and Scotsdale
Each card is that ZIP code’s whole market, including any part outside Byrnes Mill. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Byrnes Mill’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)24 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO23 miles away |
| Nearest city of 1 million+ | Chicago, IL280 miles away |
Straight-line distances from the center of Byrnes Mill; 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.
Byrnes Mill had 3,173 residents in the 2020 census, up 34% since 2000.
It’s the 194th largest of 1,060 towns in Missouri by population.
Jefferson County grew from 25,712 residents in 1900 to 226,739 in 2020.
Jefferson County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 90°F in summer, and winter lows average 22°F. About 39.8 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, St Louis Sprt Of S L Ap, MO weather station (16 miles away).
41,900 jobs at 3,956 businesses in Jefferson County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
139 doctors and other health care providers list an office in Byrnes Mill’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 20 |
|---|---|
| Dentists | 12 |
| Nurse practitioners and physician assistants | 17 |
| Mental health providers | 33 |
| Physical and occupational therapists | 35 |
| Optometrists | 8 |
| Chiropractors | 14 |
| Pharmacies | 6 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (3 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries
Counts are within about 1.5 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.
Public schools here are run by Northwest R-I, Rockwood R-Vi. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| House Springs Early Child CtrHouse Springs | Pre-K | 230 | Public | 2.4 mi |
| Blevins Elem.Eureka | K–5 | 376 | Public | 6.1 mi |
| Cedar Springs Elem.House Springs | K–5 | 425 | Public | 2.4 mi |
| Eureka Elem.Eureka | K–5 | 519 | Public | 7.2 mi |
| Geggie Elem.Eureka | K–5 | 622 | Public | 5.4 mi |
| House Springs Elem.House Springs | K–5 | 462 | Public | 1.3 mi |
| Northwest Valley Sch.House Springs | 6–8 | 686 | Public | 1.2 mi |
| Eureka Sr.. HighEureka | 9–12 | 1,586 | Public | 6.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Most Sacred Heart SchoolEureka | Pre-K–8 | 178 | Roman Catholic | 5.6 mi |
| St Mark's Lutheran SchoolEureka | Pre-K–8 | 42 | Lutheran Church–Missouri Synod | 6.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Eureka, Wildwood, LaBarque Creek and Scotsdale.
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.