Thornburg is a city in Keokuk County, Iowa, home to about 55 people across 0.2 square miles. Its ZIP code is 50255.
All in Thornburg
We’re writing up Thornburg’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)69 miles away |
|---|---|
| Closer regional airport | The Eastern Iowa Airport (CID)44 miles away |
| Nearest city of 250,000+ | Madison, WI186 miles away |
| Nearest city of 1 million+ | Chicago, IL241 miles away |
Straight-line distances from the center of Thornburg; 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.
Thornburg had 45 residents in the 2020 census, down 46% since 2000.
It’s the 933rd largest of 1,019 towns in Iowa by population.
Keokuk County grew from 24,979 residents in 1900 to 10,033 in 2020.
Keokuk 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 12°F. About 37.5 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Sigourney, IA weather station (10 miles away).
1,564 jobs at 236 businesses in Keokuk 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.
Libraries
Museums
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 Tri-County Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Tri-County Elementary SchoolThornburg | Pre-K–6 | 102 | Public | 0.1 mi |
| Tri-County JR/SR High SchoolThornburg | 7–12 | 77 | Public | 0.1 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.