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Mary Larson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Mchenry-County, North Dakota
Our Model Tree links this Mary Larson across the 1920, 1930 and 1940 US Censuses in Mchenry-County, North Dakota (XGBoost, ~Confirmed) — first a spouse (b.~1882), then head of a 3-person household.
Age 58
b. ~1882
Female
Spouse
Born: Ohio
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mchenry-County, North Dakota |
| Surname | Larson |
| Given Name | Mary H. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Star Township 155 Range 77 |
| 1935 Residence (County) | McHenry |
| Additional Details | |
| Highest Grade | C 1 |
| 1935 Residence | Same Place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Star Township 155 Range 77 |
| Est. Birth Year | ~1882 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Hazel Larson | Daughter | — | 19 | ~1921 |
| Arthur Larson | Head | — | 52 | ~1888 |
| Mary Larson | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Mchenry, North …
Spouse, age 34
Mchenry, North Dakota · implied b. ~1886 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Mchenry, North …
Spouse, age 46
Mchenry, North Dakota · implied b. ~1884 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ohio |
| Age at First Marriage | 30 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Mchenry-County, North …
Spouse, age 58
Mchenry-County, North Dakota · implied b. ~1882 — 3 household members
| Surname | Larson |
| Given Name | Mary H. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 58 |
| Marital Status | Married |
| Birthplace | Ohio |
| 1935 Residence (City) | Star Township 155 Range 77 |
| 1935 Residence (County) | McHenry |
| Highest Grade | C 1 |
| 1935 Residence | Same Place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Larson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Larson
Spouse · 1940 · age 58 · b. ~1882 · North Dakota
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Mchenry-County, North Dakota
Open full size
1940 US Federal Census — Mchenry-County, North Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03005-00768)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Axel O. Rongslie | 44 | Head | Farmer | North Dakota |
| 2 | Agnes C. Rongslie | 30 | Wife | Farmer | North Dakota |
| 3 | Mathea Rongslie | 82 | Mother | — | Norway |
| 4 | Orville Cole | 39 | Hired hand | Farm Laborer | North Dakota |
| 5 | Herman Arnon | 29 | Hired hand | Farm Laborer | North Dakota |
| 6 | Albert J. Schiele | 28 | Hired hand | Farm Laborer | North Dakota |
| 7 | Leo R. Migler | 28 | Head | Farm Laborer | North Dakota |
| 8 | Bernice G. Migler | 26 | Wife | — | Canada English |
| 9 | Niles F. Neuhime | 29 | Brother | Farm Laborer | North Dakota |
| 10 | Sigval Nelson | 49 | Head | Farmer | North Dakota |
| 11 | Ella Nelson | 40 | Wife | — | North Dakota |
| 12 | Irene V. Nelson | 17 | Daughter | — | North Dakota |
| 13 | Norma H. Nelson | 15 | Daughter | — | North Dakota |
| 14 | Kenneth W. Nelson | 11 | Son | — | North Dakota |
| 15 | Aris V. Nelson | 10 | Daughter | — | North Dakota |
| 16 | Clarence P. Anderson | 45 | Head | Farmer | North Dakota |
| 17 | Hannah Anderson | 83 | Mother | — | Norway |
| 18 | Howard Vermedal | 47 | Head | Farmer | North Dakota |
| 19 | Minnie Vermedal | 44 | Sister | — | North Dakota |
| 20 | Carrie Rosenberger | 36 | Housekeeper | Housekeeper | North Dakota |
| 21 | Myron E. Morn | 18 | Hired hand | Farm Laborer | North Dakota |
| 22 | Clarence Vermedal | 46 | Head | Farmer | North Dakota |
| 23 | Margaret I. Vermedal | 18 | Wife | — | North Dakota |
| 24 | Arthur T. Bruech | 50 | Head | Farmer | Minnesota |
| 25 | Anna C. Bruech | 46 | Wife | — | North Dakota |
| 26 | Irene M. Bruech | 21 | Daughter | Servant | North Dakota |
| 27 | Elmer H. Bruech | 19 | Son | Farm Laborer | North Dakota |
| 28 | John A. Bruech | 17 | Son | Farm Laborer | North Dakota |
| 29 | Betty J. Bruech | 16 | Daughter | — | North Dakota |
| 30 | Dorothy E. Bruech | 14 | Daughter | — | North Dakota |
| 31 | M. Ruth Bruech | 10 | Daughter | — | North Dakota |
| 32 | Linda C. Bruech | 4 | Daughter | — | North Dakota |
| 33 | Della Strand | 29 | Lodger | School Teacher | North Dakota |
| 34 | Arthur S. Larson | 52 | Head | Farmer | North Dakota |
| 35 | Mary H. Larson THIS PERSON | 58 | Wife | — | Ohio |
| 36 | Hazel M. Larson | 19 | Daughter | — | North Dakota |
| 37 | Ole K. Rongslie | 49 | Head | Farmer | North Dakota |
| 38 | Viola R. Rongslie | 41 | Wife | — | North Dakota |
| 39 | Eilleen J. Rongslie | 18 | Daughter | — | North Dakota |
| 40 | Vernon O. Rongslie | 13 | Son | — | North Dakota |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)