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Where am ILOCATED

Clayton County, Iowa

Clayton County, Iowa, has 16,845 residents (July 2025 estimate). Its county seat is Elkader. It uses Central Time and covers 778 sq mi (2,016 km²) of land.

Des MoinesCedar RapidsDavenport
Clayton County in Iowa
GuttenbergMononaElkaderStrawberry Point
Clayton County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
16,845
Land area
778 sq mi (2,016 km²)
County seat or government
Elkader
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$67,242 ± $4,606
Median home value
$168,500 ± $5,186
Median rent, with utilities
$790 ± $34
Homes lived in by their owners
78% ± 2.4 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Dubuque, IA metro area and Platteville, WI micro area
Water area
14.2 sq mi (36.7 km²)
State
Iowa
County code (FIPS)
19043
Coordinates (central point)
42.840985, -91.323576
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Clayton County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 521623,744 people
  2. 520522,999 people
  3. 521592,398 people
  4. 520762,258 people
  5. 520432,058 people
  6. 520421,804 people
  7. 521571,451 people
  8. 520731,381 people
  9. 520491,370 people
  10. 520351,331 people
  11. 521411,259 people
  12. 520531,148 people
All 24
  1. 52135834 people
  2. 50606803 people
  3. 52156769 people
  4. 52047462 people
  5. 52072454 people
  6. 52050422 people
  7. 52169367 people
  8. 52077313 people
  9. 52044297 people
  10. 52158290 people
  11. 52048201 people
  12. 52066124 people

24 ZIP Code areas overlap Clayton County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Clayton County, largest first

  1. Jefferson Township2,675 people
  2. Monona Township2,409 people
  3. Cass Township1,801 people
  4. Boardman Township1,796 people
  5. Mendon Township1,707 people
  6. Garnavillo Township987 people
  7. Lodomillo Township668 people
  8. Volga Township581 people
  9. Grand Meadow Township544 people
  10. Farmersburg Township444 people
  11. Millville Township422 people
  12. Mallory Township387 people
All 22
  1. Buena Vista Township357 people
  2. Sperry Township352 people
  3. Read Township326 people
  4. Marion Township310 people
  5. Elk Township288 people
  6. Clayton Township285 people
  7. Wagner Township226 people
  8. Highland Township186 people
  9. Cox Creek Township138 people
  10. Giard Township124 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Iowa, by county

School districts in Clayton County, largest first

  1. Western Dubuque County Community School District22,697 people
  2. North Fayette Valley Community School District8,485 people
  3. MFL MarMac Community School District5,181 people
  4. Clayton Ridge Community School District5,110 people
  5. Postville Community School District3,880 people
  6. Starmont Community School District3,756 people
  7. Central Community School District3,165 people
  8. Edgewood-Colesburg Community School District3,033 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Postville, Iowa (city)2,979 people
  2. Guttenberg, Iowa (city)1,782 people
  3. Monona, Iowa (city)1,531 people
  4. Elkader, Iowa (city)1,293 people
  5. Strawberry Point, Iowa (city)1,267 people
  6. Garnavillo, Iowa (city)816 people
  7. Edgewood, Iowa (city)752 people
  8. McGregor, Iowa (city)719 people
  9. Marquette, Iowa (city)443 people
  10. Farmersburg, Iowa (city)375 people
  11. Luana, Iowa (city)317 people
  12. Volga, Iowa (city)216 people
All 18
  1. North Buena Vista, Iowa (city)139 people
  2. Osterdock, Iowa (city)136 people
  3. Garber, Iowa (city)105 people
  4. St. Olaf, Iowa (city)76 people
  5. Clayton, Iowa (city)57 people
  6. Elkport, Iowa (city)22 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Delaware County, Iowa26 mi south
  2. Fayette County, Iowa26 mi west
  3. Allamakee County, Iowa30 mi north
  4. Grant County, Wisconsin32 mi east
  5. Crawford County, Wisconsin34 mi northeast
  6. Dubuque County, Iowa35 mi southeast
  7. Buchanan County, Iowa37 mi southwest
  8. Winneshiek County, Iowa41 mi northwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.