Osterdock is a city in Clayton County, Iowa, home to about 136 people across 0.4 square miles. It has no ZIP code of its own: it’s part of 52035 and 52052.
Homes sold for a median of $92 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Colesburg; part is in Osterdock
Mostly Guttenberg; part is in Osterdock
Each card is that ZIP code’s whole market, including any part outside Osterdock. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Osterdock’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)152 miles away |
|---|---|
| Closer regional airport | Dubuque Regional Airport (DBQ)31 miles away |
| Nearest city of 250,000+ | Madison, WI91 miles away |
| Nearest city of 1 million+ | Chicago, IL187 miles away |
Straight-line distances from the center of Osterdock; 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.
Osterdock had 43 residents in the 2020 census, down 14% since 2000.
It’s the 795th largest of 1,019 towns in Iowa by population.
Clayton County grew from 27,750 residents in 1900 to 17,043 in 2020.
Clayton County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 10°F. About 37.4 inches of rain and melted snow fall in a typical year, with about 34 inches of snow.
Source: NOAA 1991–2020 climate normals, Guttenberg L&D 10, IA weather station (6 miles away).
4,999 jobs at 487 businesses in Clayton County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
26 doctors and other health care providers list an office in Osterdock’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 6 |
|---|---|
| Specialist doctors | 1 |
| Dentists | 4 |
| Nurse practitioners and physician assistants | 5 |
| Mental health providers | 2 |
| Physical and occupational therapists | 6 |
| Chiropractors | 2 |
| Pharmacies | 3 |
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 Edgewood-Colesburg Comm School District, Clayton Ridge Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Edgewood-Colesburg Elementary SchoolColesburg | Pre-K–6 | 284 | Public | 5.3 mi |
| Iowa Virtual AcademyGuttenberg | K–12 | 1,457 | Public | 5.8 mi |
| Clayton Ridge Middle SchoolGuttenberg | 6–8 | 140 | Public | 6.0 mi |
| Clayton Ridge High SchoolGuttenberg | 9–12 | 176 | Public | 6.0 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 Guttenberg and Colesburg.
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.