JM
John Mcdonnell — 1920 US Census Record
Model Tree available1920 United States Federal Census · Cascade, Montana
Our Model Tree links this John Mcdonnell across the 1920, 1930 and 1940 US Censuses in Cascade, Montana (XGBoost, ~Confirmed), with identified parents Frank & Frank — first a son (b.~1913), then head of a 7-person household.
Age 7
b. ~1913
Male
Son
Born: Montana
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Cascade, Montana |
| Surname | McDonnell |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Township / Ward | Great Falls City |
| Est. Birth Year | ~1913 |
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.
7 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Mcdonnell | Son | — | 7 | ~1913 |
| Marion Mcdonnell | Daughter | — | 9 | ~1911 |
| Francis Mcdonnell | Son | — | 5 | ~1915 |
| Helen Mcdonnell | Daughter | — | 13 | ~1907 |
| Frank Mcdonnell | Head | — | 37 | ~1883 |
| Mabel Mcdonnell | Spouse | — | 33 | ~1887 |
| Dorothy Mcdonnell | Daughter | — | 11 | ~1909 |
Census Appearances
1920
Cascade, Montana
Son, age 7
Cascade, Montana · implied b. ~1913 — 7 household members
| Surname | McDonnell |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Illinois |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Cascade, Montana
Son, age 17
Cascade, Montana · implied b. ~1913 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Macdonnell |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Cascade-County, Montana
Son, age 27
Cascade-County, Montana · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonall |
| Given Name | John C. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Teton |
| Occupation | Manager |
| Industry | Mustard Seed Purchasing |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1200 |
| Highest Grade | C 4 |
| 1935 Residence | Montana |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Macdonnell (~0.92 confidence) and father Frank Mcdonnell (~0.92 confidence) and mother Mabel Mcdonnell (~0.92 confidence) and mother Mabel Mcdonall (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Macdonnell
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Frank Mcdonnell
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Mabel Mcdonnell
b. ~1887
Source mother
● Household
· direct · ~0.92
Mother
Mabel Mcdonall
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mcdonnell
Son · 1920 · age 7 · b. ~1913 · Montana
★ You are viewing this record
Sibling
Dorothy Mcdonnell
Sibling · 1920 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marion Mcdonnell
Sibling · 1920 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Mcdonnell
Sibling · 1920 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mcdonnell
Sibling · 1920 · age 13
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
1920 US Federal Census — Cascade, Montana
Open full size
1920 US Federal Census — Cascade, Montana
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu968unit:0129)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Frederick Sanborn | 27 | Head | Salesman | Minnesota |
| 52 | Frances H. Sanborn | 25 | Wife | — | Montana |
| 53 | Jean Sanborn | 8 | Daughter | — | Montana |
| 54 | Paul R. Flint | 31 | Head | Publisher | Iowa |
| 55 | Ada C. Flint | 29 | Wife | — | North Dakota |
| 56 | Paul R. Jr. Flint | 8 | Son | — | North Dakota |
| 57 | Leah C. Flint | 6 | Daughter | — | Montana |
| 58 | Danice R. Flint | 4 | Daughter | — | Montana |
| 59 | Wayne E. Waltman | 34 | Head | Bookkeeper | Iowa |
| 60 | Margaret A. Waltman | 20 | Wife | — | Iowa |
| 61 | Frederick E. Beaty | 38 | Head | Manager | Texas |
| 62 | Katharine G. Beaty | 36 | Wife | — | Virginia |
| 63 | Laurette Beaty | 7 | Daughter | — | Oklahoma |
| 64 | Joseph A. Claudon | 33 | Head | Manager | Kansas |
| 65 | Josephine C. Claudon | 32 | Wife | — | Colorado |
| 66 | Joseph A. Claudon | 7 | Son | — | Colorado |
| 67 | Gertine Claudon | 6 | Daughter | — | Colorado |
| 68 | Leo Doherty | 29 | Head | Keeper | Minnesota |
| 69 | Ruby Doherty | 30 | Wife | — | Montana |
| 70 | William E. Doherty | 1 | Son | — | Montana |
| 71 | Frank E. Mcdonnell | 37 | Head | Wholesale Dealer | Minnesota |
| 72 | Mabel C. Mcdonnell | 33 | Wife | — | Illinois |
| 73 | Helen F. Mcdonnell | 13 | Daughter | — | Montana |
| 74 | Dorothy M. Mcdonnell | 11 | Daughter | — | Montana |
| 75 | Marion L. Mcdonnell | 9 | Daughter | — | Montana |
| 76 | John C. Mcdonnell THIS PERSON | 7 | Son | — | Montana |
| 77 | Francis R. Mcdonnell | 5 | Son | — | Montana |
| 78 | Lawrence J. Mcknight | 25 | Head | Salesman | Iowa |
| 79 | Katharine M. Mcknight | 26 | Wife | — | Montana |
| 80 | William Mar. Crowley | 25 | Head | Salesman | Illinois |
| 81 | Mary A. Crowley | 23 | Wife | — | Illinois |
| 82 | Frank Edwards | 23 | Lodger | Salesman | United States |
| 83 | Andrew Thisted | 55 | Head | Merchant | Norway |
| 84 | Augusta Thisted | 48 | Wife | — | Sweden |
| 85 | Norman N. Thisted | 24 | Son | Merchant | Montana |
| 86 | Violet Thisted | 23 | Daughter | — | Montana |
| 87 | Walter Thisted | 22 | Son | Salesman | Montana |
| 88 | Helen Thisted | 21 | Daughter | — | Montana |
| 89 | Karl Thisted | 19 | Son | — | Montana |
| 90 | William Terrill | 57 | Head | Foreman | England |
| 91 | Amelia C. Terrill | 51 | Wife | — | Michigan |
| 92 | Arthur H. Terrill | 31 | Son | Dentist | Michigan |
| 93 | Lillian M. Terrill | 30 | Daughter-in-law | — | Minnesota |
| 94 | Arthur Jr. Terrill | 4 | Grandson | — | Montana |
| 95 | William G. Terrill | 1 | Grandson | — | Montana |
| 96 | Frank S. Terrill | 18 | Son | — | Montana |
| 97 | Eva Bellman | 26 | Lodger | Bookkeeper | Indiana |
| 98 | Earl Bellman | 33 | Lodger | Cabinet Maker | Indiana |
| 99 | Helen Nelson | 22 | Lodger | Bookkeeper | North Dakota |
| 100 | Bertha Nelson | 20 | Lodger | Saleslady | Illinois |
Pedigree Summary
John + 4 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)