JM
James Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cuyahoga-County, Ohio
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in Cuyahoga-County, Ohio (XGBoost, ~Confirmed), with identified parents Joseph & Louise — first a son (b.~1916), then head of a 8-person household.
Age 24
b. ~1916
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cuyahoga-County, Ohio |
| Surname | McMahon |
| Given Name | James William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | University Heights Village |
| 1935 Residence (County) | Cuyahoga |
| Additional Details | |
| Industry | 0 |
| Highest Grade | C 3 |
| 1935 Residence | Same house |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | University Heights Village |
| Est. Birth Year | ~1916 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Irene Mcmahon | Daughter | — | 27 | ~1913 |
| Marie Mcmahon | Daughter | — | 21 | ~1919 |
| Loretta Mcmahon | Daughter | — | 17 | ~1923 |
| Alice Mcmahon | Daughter | — | 32 | ~1908 |
| Louise Mcmahon | Daughter | — | 19 | ~1921 |
| Joseph Mcmahon | Head | — | 61 | ~1879 |
| James Mcmahon | Son | — | 24 | ~1916 |
| Louise Mcmahon | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Cuyahoga, Ohio
Son, age 5
Cuyahoga, Ohio · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Cuyahoga, Ohio
Son, age 15
Cuyahoga, Ohio · implied b. ~1915 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Cuyahoga-County, Ohio
Son, age 24
Cuyahoga-County, Ohio · implied b. ~1916 — 8 household members
| Surname | McMahon |
| Given Name | James William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | University Heights Village |
| 1935 Residence (County) | Cuyahoga |
| Industry | 0 |
| Highest Grade | C 3 |
| 1935 Residence | Same house |
| 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 James Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Mcmahon (~0.92 confidence) and mother Louise Mcmahon (~0.92 confidence) and mother Mary Yorke (~0.92 confidence) and father Charles Mcmahon (~0.92 confidence) and father Charles Mcmahon (~0.92 confidence) and mother Elizabeth Mcmahon (~0.92 confidence) and mother Elizabeth Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 7 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Mcmahon
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Louise Mcmahon
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Mary Yorke
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
Charles Mcmahon
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Charles Mcmahon
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Mcmahon
b. ~1893
Source mother
● Household
· direct · ~0.92
Mother
Elizabeth Mcmahon
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
James Mcmahon
Son · 1940 · age 24 · b. ~1916 · Ohio
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Sibling
Loretta Mcmahon
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Mcmahon
Sibling · 1940 · age 32
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Mcmahon
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louise Mcmahon
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Mcmahon
Sibling · 1940 · age 21
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 — Cuyahoga-County, Ohio
Open full size
1940 US Federal Census — Cuyahoga-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03059-00393)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Eleanor Clasen | 11 | Daughter | — | Ohio |
| 2 | Margaret Childs | 39 | Head | Manual Supervisor | Maryland |
| 3 | Gertrude Childs | 36 | Wife | — | Ohio |
| 4 | Carole Jane Childs | 0 | Daughter | — | Ohio |
| 5 | Charles Junge | 35 | Head | Research Metallurgist | Ohio |
| 6 | Elizabeth Junge | 30 | Wife | — | Ohio |
| 7 | Loyal Tinkler | 46 | Head | Metallurgist | New York |
| 8 | Marjorie Tinkler | 42 | Wife | — | New York |
| 9 | Raymond F. Persche | 46 | Head | Project Superintendent | Ohio |
| 10 | Cecilia M. Persche | 49 | Wife | — | Ohio |
| 11 | Robert Persche | 18 | Son | — | Ohio |
| 12 | Eleanore Persche | 13 | Daughter | — | Ohio |
| 13 | Mary Persche | 12 | Daughter | — | Ohio |
| 14 | John Persche | 10 | Son | — | Ohio |
| 15 | Herbert Scheffert | 43 | Head | Fireman | Ohio |
| 16 | Inez Scheffert | 48 | Wife | — | West Virginia |
| 17 | Robert G. Scheffert | 15 | Son | News Carrier | Ohio |
| 18 | Virginia L. Scheffert | 11 | Daughter | — | Ohio |
| 19 | John W. Naragon | 73 | Head | Custodian | Ohio |
| 20 | Teresa Naragon | 66 | Wife | — | Ohio |
| 21 | A. Bruce Barclay | 52 | Lodger | Laborer | Ohio |
| 22 | — | None | — | — | — |
| 23 | — | None | — | — | — |
| 24 | Castell B. Buck | 50 | Head | Switchman | Kentucky |
| 25 | Geraldine Buck | 41 | Wife | Stenographer Clerk | Ohio |
| 26 | Henry L. Buchin | 36 | Head | Clerk | Ohio |
| 27 | Marie L. Buchin | 33 | Wife | — | New York |
| 28 | Marilyn W. Buchin | 7 | Daughter | — | Ohio |
| 29 | Elaine O. Buchin | 3 | Daughter | — | Ohio |
| 30 | Frank H. Hole | 46 | Head | Salesmanager | Ohio |
| 31 | Alda Hole | 50 | Wife | — | Ohio |
| 32 | Jane Hole | 24 | Daughter | — | Ohio |
| 33 | Joseph J. Mcmahon | 61 | Head | Electrician | Ohio |
| 34 | Louise M. Mcmahon | 58 | Wife | — | India |
| 35 | Alice Louise Mcmahon | 32 | Daughter | Record Keeper Record Room | Ohio |
| 36 | Irene Frances Mcmahon | 27 | Daughter | Technician | Ohio |
| 37 | James William Mcmahon THIS PERSON | 24 | Son | — | Ohio |
| 38 | Marie A. Mcmahon | 21 | Daughter | Record Room Clerk | Ohio |
| 39 | Louise A. Mcmahon | 19 | Daughter | Record Clerk | Ohio |
| 40 | Loretta M. Mcmahon | 17 | Daughter | — | Ohio |
Related Census Records
Pedigree Summary
James + 5 siblings
Gen 1 · 7 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)