Knoxville is a city in Marion County, Iowa, home to about 7,473 people across 4.6 square miles. Its ZIP code is 50138.
Homes sold for a median of $159 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Knoxville. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Knoxville’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Des Moines International Airport (DSM)33 miles away |
|---|---|
| Nearest city of 250,000+ | Omaha, NE154 miles away |
| Nearest city of 1 million+ | Chicago, IL282 miles away |
Straight-line distances from the center of Knoxville; 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.
Knoxville had 7,595 residents in the 2020 census, down 2% since 2000.
It’s the 54th largest of 1,019 towns in Iowa by population.
Marion County grew from 24,159 residents in 1900 to 33,414 in 2020.
Marion County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 13°F. About 37.7 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Knoxville, IA weather station (about a mile away).
17,934 jobs at 859 businesses in Marion County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
92 doctors and other health care providers list an office in Knoxville.
Nearest hospitals
Providers with an office here
| Primary care doctors | 16 |
|---|---|
| Specialist doctors | 4 |
| Dentists | 7 |
| Nurse practitioners and physician assistants | 19 |
| Mental health providers | 26 |
| Physical and occupational therapists | 13 |
| Optometrists | 3 |
| Chiropractors | 4 |
| 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 (6 nearby)
Grocery stores (3 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Museums (1 nearby)
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.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Knoxville Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| West ElementaryKnoxville | Pre-K–2 | 485 | Public | 1.0 mi |
| Northstar Elementary SchoolKnoxville | 3–5 | 348 | Public | 0.9 mi |
| Knoxville Middle SchoolKnoxville | 6–8 | 323 | Public | 1.1 mi |
| Knoxville High SchoolKnoxville | 9–12 | 508 | Public | 1.1 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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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.