JM
John Mcdonnell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Park-County, Montana
Our Model Tree links this John Mcdonnell across the 1930 and 1940 US Censuses in Park-County, Montana (XGBoost, ~Confirmed) — first a head (b.~1911), then head of a 5-person household.
Age 29
b. ~1911
Male
Head
Born: Oregon
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Park-County, Montana |
| Surname | McDonnell |
| Given Name | John D. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | School District 60 Cinnabar Basin |
| 1935 Residence (County) | Park |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | C 3 |
| 1935 Residence | Same House |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
| Occupation | Farmer |
| Township / Ward | School District 60 Cinnabar Basin |
| Est. Birth Year | ~1911 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marguerite Mcdonnell | Spouse | — | 26 | ~1914 |
| John Mcdonnell | Head | — | 29 | ~1911 |
| John Mcdonnell | Son | — | 3 | ~1937 |
| Ronald Mcdonnell | Son | — | 1 | ~1939 |
| Marguerite Mcdonnell | Daughter | — | 4 | ~1936 |
Census Appearances
1930
Park, Montana
Head, age 19
Park, Montana · implied b. ~1911
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | McDonald |
| Given Name | John A |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Oregon |
| Father's Birthplace | Michigan |
| Mother's Birthplace | England |
| Occupation | Laborer |
| Industry | Section house |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | No |
| Home Value / Rent | R |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
1940
Park-County, Montana
Head, age 29
Park-County, Montana · implied b. ~1911 — 5 household members
| Surname | McDonnell |
| Given Name | John D. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Oregon |
| 1935 Residence (City) | School District 60 Cinnabar Basin |
| 1935 Residence (County) | Park |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | C 3 |
| 1935 Residence | Same House |
| Birth State | Oregon |
| Birth Country | United States |
| Birthplace (normalized) | oregon |
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 Mcdonnell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcdonnell
Head · 1940 · age 29 · b. ~1911 · Montana
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Park-County, Montana
Open full size
1940 US Federal Census — Park-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02226-00654)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jack Vravetz | 46 | Head | Miner | Slovenia |
| 2 | Mary Vravetz | 39 | Wife | — | Montana |
| 3 | Florence Vravetz | 14 | Daughter | — | Montana |
| 4 | Mary Vravetz | 13 | Daughter | — | Montana |
| 5 | Roy Dapher | 45 | Head | — | Germany |
| 6 | Thelma Dapher | 40 | Wife | — | Montana |
| 7 | Joseph Walter Dapher | 11 | Son | — | Montana |
| 8 | Mary Heist | 63 | Head | — | Russia |
| 9 | Jr. H. Heist | 43 | Head | — | Montana |
| 10 | Elma Agnes Heist | 41 | Wife | — | Montana |
| 11 | Earl Eldon Heist | 14 | Son | — | Montana |
| 12 | Fred Bassett | 74 | Head | Farmer | California |
| 13 | Leah Bassett | 68 | Wife | — | Oxford |
| 14 | Nello Daniel Ayres | 49 | Head | Carpenter | Montana |
| 15 | Florence C. Ayres | 42 | Wife | — | Montana |
| 16 | Wilbur Dale Ayres | 14 | Son | — | Wyoming |
| 17 | Walter Daniel Ayres | 11 | Son | — | Montana |
| 18 | J. A. Bailey | 59 | Head | Farmer | Montana |
| 19 | Marguerite Bailey | 49 | Wife | — | Montana |
| 20 | Robert A. B. Bailey | 18 | Son | — | Wyoming |
| 21 | W. H. Vinnedge | 72 | Head | Farmer | Missouri |
| 22 | Bert Dermitz | 29 | Head | Farmer | Montana |
| 23 | Velda Dermitz | 30 | Wife | — | Montana |
| 24 | James Edward Dermitz | 2 | Son | — | Montana |
| 25 | Mrs. Joseph Dermitz | 67 | Head | — | Bavaria |
| 26 | George Dermitz | 48 | Son | Farmer | Bavaria |
| 27 | John D. Jr. Mcdonnell THIS PERSON | 29 | Head | Farmer | Oregon |
| 28 | Marguerite V. Mcdonnell | 26 | Wife | — | Nebraska |
| 29 | Marguerite Diane Mcdonnell | 4 | Daughter | — | Montana |
| 30 | John Alfred Mcdonnell | 3 | Son | — | Montana |
| 31 | Ronald Ellis Mcdonnell | 1 | Son | — | Montana |
| 32 | J. A. Sr. Mcdonnell | 69 | Head | Farmer | Michigan |
| 33 | Rhoda Mcdonnell | 59 | Wife | — | England |
| 34 | Herbert Shepherd | 51 | Head | Farmer | Wyoming |
| 35 | Edna Shepherd | 42 | Wife | — | Nebraska |
| 36 | Vincent Shemely | 16 | Son | — | Montana |
| 37 | Ellie May Shemely | 15 | Daughter | — | Montana |
| 38 | Earl Joseph Shemely | 13 | Son | — | Montana |
| 39 | W. Robert Lardner | 78 | Head | Miner | Ireland |
| 40 | James Slenahapa | 25 | Head | Tractor Operator | Montana |
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)