Slope County, North Dakota Genealogy

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United StatesGotoarrow.png North Dakota Gotoarrow.png Slope County

Guide to Slope County, North Dakota ancestry, genealogy and family history, birth records, marriage records, death records, census records, family history, and military records.

County Information


The name refers to the Missouri Slope, a geographical feature that is also a popular designation for western North Dakota, particularly the area west of the Missouri River. The county government was first organized on January 14, 1915; the county seat is Amidon.[1]

County Courthouse

Slope County Courthouse
206 S Main
Amidon, ND 58620-0449
Phone: 701.879.6260
Slope County Website

Clerk District Court has marriage, death, burial, divorce, probate and court records from 1915 and land records[2]

Slope County, North Dakota Record Dates

Beginning Dates for Major County Records
Birth* Marriage Death* Court Land Probate Census
1915 1915 1915 1915 1915 1915 1920

Record Loss

There is no known history of courthouse disasters in this county.

Boundary Changes

3 November 1914: Slope County was created from Billings County.
County seat: Amidon [3]

Populated Places

  • Amidon

County Facts
Organized: November 3, 1914
County seat: Amidon
Parent County(s): Billings [3]
Variant Spellings:
Neighboring Counties
Adams  • Billings  • Bowman  • Golden Valley  • Hettinger  • Stark  • Fallon (MT)
See County Maps
Location Map
North Dakota Slope Map.png

This page is available for adoption

History Timeline


Bible Records


Business, Commerce, and Occupations


Cemeteries of Slope County, North Dakota online and in print
Tombstone Transcriptions Online
Tombstone Transcriptions in Print (Often more complete)
List of Cemeteries in the County
See North Dakota Cemeteries for more information

Census Records

Historical populations
Census Pop.  %±
1920 4,940
1930 4,150 −16.0%
1940 2,932 −29.3%
1950 2,315 −21.0%
1960 1,893 −18.2%
1970 1,484 −21.6%
1980 1,157 −22.0%
1990 907 −21.6%
2000 767 −15.4%
2010 727 −5.2%
Source: "".

State Census Records

Federal Census Records

Federal Censuses were taken for North Dakota starting in 1910. For links to Federal census indexes, see North Dakota Census.

Church Records

Church records can be found online, kept onsite at the church, or housed in a church archive or library. See North Dakota Church Records for more information on how to locate the records.

Court Records


Emigration and Immigration

Ethnic, Political, and Religious Groups

Funeral Homes



Land and Property Records

When the United States acquired North Dakota, most of the land became available for homesteading or purchase from the federal government. After land was transferred from the government to private owners, the registrar of deeds in each county recorded the land transactions in the form of deeds and mortgages. For more information, see North Dakota Land and Property.

Online Land Records

For more information see North Dakota Land and Property

Local Histories

Local histories, including those of the county, are available for Slope County. These histories can include biographies, church, school and government history, and military information.

Maps and Gazetteers


Military Records

Civil War

World War I

Naturalization and Citizenship

Online Naturalization Indexes and Records


For more information see North Dakota Newspapers.

North Dakota Newspapers Online

North Dakota Newspaper Catalogs


Other Records


Probate Records

Probate records, including wills and estates, are at the county clerk's office. See also North Dakota Probate Records.

Online Probate Records

School Records

Tax Records

County tax records are at the county treasurer's, auditor's or clerk's office in the county courthouse. Some tax records may have been moved to the North Dakota State Archives.

Vital Records

Birth, marriage, death, and divorce records may be recorded on registers, certificates, or other documents at the county clerk's office. Many records are also being digitized and put online. See North Dakota Vital Records for more information about availability and how to access them.




Online Death Indexes and Records


Research Facilities


Family History Centers

Family History Centers provide one-on-one assistance and free access to premium genealogical websites. In addition, many centers have free how-to genealogy classes.


Pioneer Trails Museum
PO Box 78
Bowman, ND 58623
Genealogy Department



Marmarth Historical Society
PO Box 93
Marmarth, ND 58643
Telephone: 701-279-6996
Clara Bliss or Dorothy Pearson
Telephone: 701-523-3600


Research Guides


  1. accessed 09/29/2016
  2. Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), Slope County, North Dakota. Page 526 At various libraries (WorldCat); FHL Book 973 D27e 2002.
  3. 3.0 3.1 The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).