Mahaska County, Iowa Genealogy

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United States Gotoarrow.png Iowa Gotoarrow.png Mahaska County

Guide to Mahaska County Iowa genealogy. Birth records, marriage records, death records, census records, family history, and military records.

Hand and keyboard.jpg Iowa
Online Records

Mahaska County, Iowa
Map of Iowa highlighting Mahaska County
Location in the state of Iowa
Map of the U.S. highlighting Iowa
Location of Iowa in the U.S.
Founded February 17, 1843
County Seat Oskaloosa

County Courthouse


Parent County

1843--Mahaska County was created 17 February 1843 from unorganized territory. It was attached to Washington County prior to organization 1 March 1844. County seat:  Oskaloosa [1]

Boundary Changes

Record Loss


Populated Places

Neighboring Counties

Jasper | Keokuk | Marion | Monroe | Poweshiek | Wapello





Most church records are held by individual churches. For contact information, check a phone directory, such as SearchBug or Dex Knows. Some denominations are gathering their records into a central repository. For more information about these major repositories, see Iowa Church Records.



Land and property records can place an ancestor in a particular location, provide economic information, and reveal family relationships. Land records include: deeds, abstracts and indexes, mortgages, leases, grants and land patents.

See Iowa Land and Property for additional information about early Iowa land grants. After land was transferred to private ownership, subsequent transactions were usually recorded at the county courthouse, where records are currently housed.

Local Histories 


  • 1875 Plat Maps this collection contains plat maps for the Townships of Adams, Black Oak, Cedar, Des Moines, Harrison, Jefferson, Madison, Monroe, Oskaloosa, Pleasant Grove, Prairie, Richland, Scott, Union, and White Oak.
  • 1895 Plat Map: Monroe Township
  • 1905 Plat Maps this collection contains plat maps for the Townships of Adams, Beacon and Oskaloosa, Black Oak, Cedar, Des Moines, Garfield and Lincoln, Harrison, Madison, Monroe, Pleasant Grove, Prairie, Richland, Scott, Spring Creek, Union, and White Oak.
  • 1913 Plat Maps this collection contains plat maps for most Townships.
  • 1914 Plat Maps this collection contains plat maps for most Townships.
  • 1920 Plat Maps this collection contains plat maps for most Townships.




In most counties in Iowa, probate records have been kept by the county judge. They include wills, fee books, claim registers, legacy records, inheritance records, probate ticklers, and dockets. The records are available at the county courthouse.

The FamilySearch Catalog lists films of probate records. To find the records for this county, use the Place Search for Iowa - Mahaska - Probate records.


Vital Records

Vital Records consist of births, adoptions, marriages, divorces, and deaths recorded on registers, certificates, and documents. A copy or an extract of most original records can be purchased from the Iowa Department of Public Health or the County Clerk's office of the county where the event occurred. See also How to order Iowa Vital Records or order electronically online.

Societies and Libraries

Family History Centers

Web Sites


  1. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).