JM
John Mcdonald — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mchenry-County, North Dakota
Our Model Tree links this John Mcdonald across the 1920, 1930 and 1940 US Censuses in Mchenry-County, North Dakota (XGBoost, ~Confirmed), with identified parents Michael & Michael — first a son (b.~1909), then head of a 4-person household.
Age 31
b. ~1909
Male
Son
Born: North Dakota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mchenry-County, North Dakota |
| Surname | McDonald |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | Grilley |
| 1935 Residence (County) | McHenry |
| Additional Details | |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | E |
| Hours Worked | 48 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
| Occupation | Farmer |
| Township / Ward | Grilley |
| Est. Birth Year | ~1909 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Michael Mcdonald | Head | — | 64 | ~1876 |
| Leo Mcdonald | Son | — | 22 | ~1918 |
| John Mcdonald | Son | — | 31 | ~1909 |
| Margaret Mcdonald | Spouse | — | 64 | ~1876 |
Census Appearances
1920
Mchenry, North …
Son, age 11
Mchenry, North Dakota · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonal |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1930
Mchenry, North …
Son, age 21
Mchenry, North Dakota · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | North Dakota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
1940
Mchenry-County, North …
Son, age 31
Mchenry-County, North Dakota · implied b. ~1909 — 4 household members
| Surname | McDonald |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | North Dakota |
| 1935 Residence (City) | Grilley |
| 1935 Residence (County) | McHenry |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | E |
| Hours Worked | 48 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | North Dakota |
| Birth Country | United States |
| Birthplace (normalized) | north dakota |
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 John Mcdonald across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Michael Mcdonal (~0.92 confidence) and father Michael Mcdonald (~0.92 confidence) and mother Margaret Mcdonald (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Michael Mcdonal
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Michael Mcdonald
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Margaret Mcdonald
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mcdonald
Son · 1940 · age 31 · b. ~1909 · North Dakota
★ You are viewing this record
Sibling
Leo Mcdonald
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-03005-00451)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Louis Stroebel | 62 | Head | Farmer | Wisconsin |
| 42 | Almaid Stroebel | 66 | Wife | — | Canada French |
| 43 | George Stroebel | 22 | son | Farmer | North Dakota |
| 44 | Arthur Grondahl | 51 | Head | Farmer | North Dakota |
| 45 | Amanda Grondahl | 36 | Wife | — | North Dakota |
| 46 | Lillian Grondahl | 16 | daughter | — | North Dakota |
| 47 | Opal Grondahl | 11 | daughter | — | North Dakota |
| 48 | Hjalmer Johnson | 33 | Head | Farmer | North Dakota |
| 49 | Clara Johnson | 27 | Wife | — | North Dakota |
| 50 | Roger Johnson | 5 | son | — | North Dakota |
| 51 | Karen Johnson | 1 | daughter | — | North Dakota |
| 52 | Fred Deuilets | 60 | Head | Farmer | Canada French |
| 53 | Anton Olson | 65 | Head | Farmer | Norway |
| 54 | Anna Olson | 50 | Wife | — | Norway |
| 55 | Jennie Olson | 25 | daughter | — | Norway |
| 56 | Melvin Olson | 23 | son | Farmer | North Dakota |
| 57 | Leonard Olson | 16 | son | — | North Dakota |
| 58 | Alice Olson | 13 | daughter | — | North Dakota |
| 59 | Arthur Hetland | 24 | Head | Farmer | South Dakota |
| 60 | Osmunda Hetland | 53 | Mother | — | Norway |
| 61 | Milton Hetland | 18 | Brother | Clerk | Minnesota |
| 62 | Earl Hetland | 15 | Brother | — | South Dakota |
| 63 | Ione Hetland | 8 | Sister | — | North Dakota |
| 64 | Willie Johnson | 25 | Head | Farmer | North Dakota |
| 65 | Christine Johnson | 66 | Mother | — | Norway |
| 66 | Jens Flaten | 43 | Lodger | Labor | Norway |
| 67 | Theodore Pfau | 32 | Head | Farmer | North Dakota |
| 68 | Nellie Pfau | 27 | Wife | — | North Dakota |
| 69 | Patricia Ann Pfau | 1 | daughter | — | North Dakota |
| 70 | Alvin Thompson | 35 | Head | Farmer | North Dakota |
| 71 | Anna Thompson | 30 | Wife | — | North Dakota |
| 72 | Helen Thompson | 9 | daughter | — | North Dakota |
| 73 | Julia Thompson | 5 | daughter | — | North Dakota |
| 74 | Richard Thompson | 2 | son | — | North Dakota |
| 75 | Michael Mcdonald | 64 | Head | — | Minnesota |
| 76 | Margaret Mcdonald | 64 | Wife | — | Minnesota |
| 77 | John Mcdonald THIS PERSON | 31 | son | Farmer | North Dakota |
| 78 | Leo Michael Mcdonald | 22 | son | Labor | North Dakota |
| 79 | Walter Hageman | 44 | Head | Farmer | Missouri |
| 80 | Lester Johnson | 25 | Head | Farmer | North Dakota |
Related Census Records
Pedigree Summary
John + 1 sibling
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
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)