JM
John Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bronx-County, New York
Our Model Tree links this John Mcmahon across the 1920, 1930 and 1940 US Censuses in Bronx-County, New York (XGBoost, ~Confirmed) — first a head (b.~1883), then head of a 3-person household.
Age 57
b. ~1883
Male
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Bronx-County, New York |
| Surname | McMahon |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Bronx |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Superintendent |
| Industry | House |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 190 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Superintendent |
| Township / Ward | New York City |
| Est. Birth Year | ~1883 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Mcmahon | Head | — | 57 | ~1883 |
| James Mcmahon | Son | — | 21 | ~1919 |
| John Mcmahon | Son | — | 23 | ~1917 |
Census Appearances
1920
Bronx, New …
Head, age 45
Bronx, New York · implied b. ~1875 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1883 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Investigator |
| Industry | Electric Co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Bronx, New …
Head, age 51
Bronx, New York · implied b. ~1879 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1880 |
| Age at First Marriage | 25 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 13000 |
| Radio Set | R |
| Veteran | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Bronx-County, New …
Head, age 57
Bronx-County, New York · implied b. ~1883 — 3 household members
| Surname | McMahon |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Bronx |
| Naturalization Status | Naturalized |
| Occupation | Superintendent |
| Industry | House |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 190 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcmahon
Head · 1940 · age 57 · b. ~1883 · New York
★ 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 — Bronx-County, New York
Open full size
1940 US Federal Census — Bronx-County, New York
Page Contents
13 people indexed on this census page (nara:1940:m-t0627-02475-00054)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Victoria Rosato | 3 | Daughter | — | New York |
| 2 | Gerard Rosato | 5 | Son | — | New York |
| 3 | Vincent Rosato | 91 | Father | — | Italy |
| 4 | Minnie Cody | 52 | Head | Waitress | Connecticut |
| 5 | Mary Cody | 21 | Daughter | Waitress | Connecticut |
| 6 | James Cody | 19 | Son | Bus Boy | Connecticut |
| 7 | Nora Cody | 16 | Daughter | — | Connecticut |
| 8 | Alexander White | 63 | Head | Printer | Pennsylvania |
| 9 | Annette White | 67 | Wife | — | New York |
| 10 | John J. Mcmahon THIS PERSON | 57 | Head | Superintendent | Ireland |
| 11 | John J. Jr. Mcmahon | 23 | Son | Counterman | New York |
| 12 | James F. Mcmahon | 21 | Son | Messenger | New York |
| 13 | E. G. Vassakos | 57 | Head | Refrigerator | Greece |
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)