De Kalb is a town in Buchanan County, Missouri, home to about 518 people across 0.3 square miles. Its ZIP code is 64440.
Homes sold for a median of $158 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside De Kalb. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up De Kalb’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Kansas City International Airport (MCI)23 miles away |
|---|---|
| Nearest city of 250,000+ | Kansas City, MO37 miles away |
| Nearest city of 1 million+ | Chicago, IL410 miles away |
Straight-line distances from the center of De Kalb; 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.
De Kalb had 233 residents in the 2020 census, down 9% since 2000.
It’s the 511th largest of 1,060 towns in Missouri by population.
Buchanan County grew from 121,838 residents in 1900 to 84,793 in 2020.
Buchanan 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 18°F. About 36.4 inches of rain and melted snow fall in a typical year, with about 17 inches of snow.
Source: NOAA 1991–2020 climate normals, Atchison, KS weather station (10 miles away).
43,357 jobs at 2,027 businesses in Buchanan County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in De Kalb.
Nearest hospitals
Providers with an office here
| Physical and occupational therapists | 1 |
|---|
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.
Public schools here are run by Buchanan Co. R-IV. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Dekalb Jr..-Sr.. HighDekalb | 7–12 | 120 | Public | 0.2 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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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.