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County · code 29063

DeKalb CountyMissouri

DeKalb County is a county in Missouri, with its seat in Maysville. It was created in 1843.

  • Founded1843
  • County seatMaysville
  • Named forJohann de Kalb
  • Land area421 sq mi + 4.5 sq mi water
  • Population11,029 2020 Census
  • Parcels mapped7,545 checked 14 October 2026
Open the free map Click any parcel in DeKalb County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ClintonGentryAndrewDaviessCaldwell Maysville Census outline · seat marked

Where it is

DeKalb on the map of Missouri

Missouri has 115 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Missouri · DeKalb highlighted

History

Founded in 1843

An old deed may name a county that no longer exists, or a boundary that has since moved.

DeKalb County was created on January 5, 1843, from Non-County Area 12, but was not initially fully organized. It was fully organized for administrative and judicial purposes on February 25, 1845. The county was named after Johann de Kalb.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1843
    DeKalb County created De Kalb created from Non-County Area 12; De Kalb not fully organized, not attached. Non-County Area 12 eliminated. · Mo. Laws 1842-1843, pub., p. 36
  2. 1845
    Changed De Kalb fully organized for administrative and judicial purposes. · Mo. Laws 1844-1845, loc. and priv., pp. 40-41

Land and parcels

What the maps cover in DeKalb

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

DeKalb by the Census

Population
11,029 2020 Census count
Housing units
4,264 2020 Census count
Land area
421 square miles
Water area
4.5 square miles
People per sq mi
26 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

DeKalb County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open DeKalb County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about DeKalb County

When was DeKalb County founded?
DeKalb County was founded in 1843, and named after Johann de Kalb.
What is the county seat of DeKalb County?
The county seat of DeKalb County is Maysville.
Is there an online parcel map for DeKalb County?
Yes. DeKalb County publishes a parcel map of 7,545 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has DeKalb County's boundary or name changed?
DeKalb County was created in 1843. Since then the Atlas of Historical County Boundaries records 1 later change.
Is my lot in a flood zone?
We do not have flood maps for DeKalb County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door