Irwin is a community in Barton County, Missouri, home to about 43 people across 0.3 square miles. It has no ZIP code of its own: it’s part of 64759.
Homes sold for a median of $168 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Lamar; part is in Irwin
Each card is that ZIP code’s whole market, including any part outside Irwin. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Irwin’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Tulsa International Airport (TUL)125 miles away |
|---|---|
| Closer regional airport | Joplin Regional Airport (JLN)27 miles away |
| Nearest city of 250,000+ | Tulsa, OK129 miles away |
| Nearest city of 1 million+ | Dallas, TX354 miles away |
Straight-line distances from the center of Irwin; 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.
Irwin had 47 residents in the 2020 census, down 32% since 2010.
It’s the 992nd largest of 1,060 towns in Missouri by population.
Barton County grew from 18,253 residents in 1900 to 11,637 in 2020.
Barton 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 22°F. About 49 inches of rain and melted snow fall in a typical year, with about 7 inches of snow.
Source: NOAA 1991–2020 climate normals, Lamar 7n, MO weather station (6 miles away).
2,467 jobs at 237 businesses in Barton County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
43 doctors and other health care providers list an office in Irwin.
Nearest hospitals
Providers with an office here
| Primary care doctors | 5 |
|---|---|
| Specialist doctors | 11 |
| Dentists | 3 |
| Nurse practitioners and physician assistants | 8 |
| Mental health providers | 8 |
| Physical and occupational therapists | 4 |
| Optometrists | 4 |
| Pharmacies | 5 |
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.
Grocery stores
Pharmacies
Libraries
Counts are within about 1 mile 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 Lamar R-I. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| East Elem.Lamar | Pre-K–2 | 281 | Public | 4.8 mi |
| Lamar Elem.Lamar | 3–5 | 253 | Public | 3.4 mi |
| Lamar MiddleLamar | 6–8 | 255 | Public | 3.4 mi |
| Lamar Careertechnical CenterLamar | 9–12 | — | Career and Technical | 3.2 mi |
| Lamar HighLamar | 9–12 | 369 | Public | 3.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Lamar, Iantha, Lamar Heights and Milford.
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.