JM
John Mahoney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cascade-County, Montana
Our Model Tree links this John Mahoney across the 1920, 1930 and 1940 US Censuses in Cascade-County, Montana (XGBoost, ~Confirmed), with identified parents James & Mary — first a son (b.~1908), then head of a 2-person household.
Age 32
b. ~1908
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cascade-County, Montana |
| Surname | Mahoney |
| Given Name | John J. @ |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Cascade |
| Additional Details | |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 30 |
| Income (1939) | 288 |
| Highest Grade | No 6 |
| 1935 Residence | Montana |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Farm Laborer |
| Township / Ward | District 47 New Century |
| Est. Birth Year | ~1908 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Mahoney | Head | — | 69 | ~1871 |
| John Mahoney | Son | — | 32 | ~1908 |
Census Appearances
1920
Cascade, Montana
Son, age 11
Cascade, Montana · implied b. ~1909 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John G. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Cascade, Montana
Son, age 22
Cascade, Montana · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | Minnesota |
| Occupation | Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Cascade-County, Montana
Son, age 32
Cascade-County, Montana · implied b. ~1908 — 2 household members
| Surname | Mahoney |
| Given Name | John J. @ |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Cascade |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 30 |
| Income (1939) | 288 |
| Highest Grade | No 6 |
| 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 Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Mahoney
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1871
Source mother
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mahoney
Son · 1940 · age 32 · b. ~1908 · 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 — Cascade-County, Montana
Open full size
1940 US Federal Census — Cascade-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02215-00378)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Mahoney | 69 | head | — | Minnesota |
| 2 | John J. @ Mahoney THIS PERSON | 32 | son | Farm Laborer | Montana |
| 3 | Clair A. @ Bond | 42 | head | Farmer | Iowa |
| 4 | Robert L. Bond | 19 | son | Farm Laborer | Montana |
| 5 | Ruby M. Bond | 17 | daughter | — | Montana |
| 6 | Ruth L. Bond | 14 | daughter | — | Montana |
| 7 | Ray D. Bond | 12 | son | — | Montana |
| 8 | Agnes E. Bond | 10 | daughter | — | Montana |
| 9 | Dorthy L. Bond | 5 | daughter | — | Montana |
| 10 | Julia E. Bond | 77 | Mother | — | Iowa |
| 11 | Henry G. Vaskey | 38 | head | Farmer | Montana |
| 12 | Ada H. @ Vaskey | 36 | wife | — | Montana |
| 13 | Lois J. Vaskey | 13 | daughter | — | Montana |
| 14 | Henry A. Vaskey | 9 | son | — | Montana |
| 15 | Albert J. Forrest | 25 | head | Laborer | Montana |
| 16 | Evangline @ Forrest | 22 | wife | — | Montana |
| 17 | Carrol Forrest | 2 | daughter | — | Montana |
| 18 | Sam A. @ Krebbs | 50 | head | Farmer | Illinois |
| 19 | Ann R. Krebbs | 44 | wife | — | Wyoming |
| 20 | Clyde J. Krebbs | 22 | son | Farm Laborer | Montana |
| 21 | Jack L. Krebbs | 18 | son | — | Montana |
| 22 | Mabel M. Krebbs | 17 | daughter | — | Montana |
| 23 | Mike @ Sanders | 69 | head | Farmer | Slovakia |
| 24 | Mary Sanders | 62 | wife | — | Slovakia |
| 25 | Joe Sanders | 35 | son | Miner | Minnesota |
| 26 | Samuel W. @ Bright | 56 | head | Farmer | Montana |
| 27 | Ruth E. Bright | 51 | wife | — | Tennessee |
| 28 | Betty J. Bright | 11 | daughter | — | Montana |
| 29 | Ruby Korpi | 20 | daughter | — | Montana |
| 30 | Clarence Korpi | 26 | son-in-law | Farm Laborer | Minnesota |
| 31 | Ruth Ann Korpi | 0 | grand daughter | — | Montana |
| 32 | Ben F. @ Mccoy | 34 | head | Farmer | Montana |
| 33 | Edith M. Mccoy | 26 | wife | — | Montana |
| 34 | Tillie M. Ab Mccoy | 62 | Mother | — | Iowa |
| 35 | William Cotter | 59 | hired hand | Farm Laborer | Minnesota |
| 36 | Mary @ Keoster | 24 | lodger | Teacher | Montana |
| 37 | Leroy Height | 22 | head | Farm Laborer | Wisconsin |
| 38 | Charles Holmberg | 70 | head | — | Sweden |
| 39 | Bertha Holmberg | 62 | wife | — | Minnesota |
| 40 | J. Martin Johnson | 32 | head | Mechanic | Montana |
Pedigree Summary
John
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)