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.~1897), then head of a 9-person household.
Age 43
b. ~1897
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Bronx-County, New York |
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | New York |
| 1935 Residence (County) | Bronx |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Laborer |
| Industry | Cons. Gas |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | No 6 |
| 1935 Residence | New York |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Laborer |
| Township / Ward | New York |
| Est. Birth Year | ~1897 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Mcmahon | Daughter | — | 11 | ~1929 |
| Alice Mcmahon | Daughter | — | 20 | ~1920 |
| Nora Mcmahon | Daughter | — | 21 | ~1919 |
| Eleanora Mcmahon | Daughter | — | 3 | ~1937 |
| John Mcmahon | Head | — | 43 | ~1897 |
| John Mcmahon | Son | — | 17 | ~1923 |
| Charles Mcmahon | Son | — | 15 | ~1925 |
| Martin Mcmahon | Son | — | 8 | ~1932 |
| Margaret Mcmahon | Spouse | — | 44 | ~1896 |
Census Appearances
1920
New York, …
Other, age 21
New York, New York · implied b. ~1899 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1911 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Table Clerk |
| Industry | Telegraph |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Year of Naturalization | 1919 |
| Birthplace (normalized) | ireland |
1930
New York, …
Other, age 32
New York, New York · implied b. ~1898 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Brother in law |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1920 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Express Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Bronx-County, New …
Head, age 43
Bronx-County, New York · implied b. ~1897 — 9 household members
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | New York |
| 1935 Residence (County) | Bronx |
| Naturalization Status | Naturalized |
| Occupation | Laborer |
| Industry | Cons. Gas |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | No 6 |
| 1935 Residence | New York |
| 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 43 · b. ~1897 · 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
40 people indexed on this census page (nara:1940:m-t0627-02472-00193)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Eliza Kelleher | 24 | Daughter | Laundry | New York |
| 2 | Alfred Wolf | 57 | Head | Salesman | Poland |
| 3 | Margaret Wolf | 50 | Wife | — | Germany |
| 4 | Joseph Wolf | 33 | Son | Clerk | Pennsylvania |
| 5 | Stephen Wolf | 25 | Daughter | — | Mass. |
| 6 | Margaret Harnett | 36 | Head | — | New York |
| 7 | Dorothy Harnett | 10 | Daughter | — | New York |
| 8 | Myles Mcdonnell | 49 | Brother | — | Illinois |
| 9 | Andrew Quatty | 49 | Roomer | Garage Man | New York |
| 10 | Vincent Maroldi | 50 | Head | Laborer | Italy |
| 11 | Mary Maroldi | 38 | Wife | — | Italy |
| 12 | Joseph Maroldi | 16 | Son | — | New York |
| 13 | Martin Maroldi | 14 | Son | — | New York |
| 14 | Anthony Maroldi | 13 | Son | — | New York |
| 15 | John Mcmahon THIS PERSON | 43 | Head | Laborer | Ireland |
| 16 | Margaret Mcmahon | 44 | Wife | — | New York |
| 17 | Nora Mcmahon | 21 | Daughter | Examiner | New York |
| 18 | Alice Mcmahon | 20 | Daughter | Saleswoman | New York |
| 19 | John Jr. Mcmahon | 17 | Son | Messenger | New York |
| 20 | Charles Mcmahon | 15 | Son | — | New York |
| 21 | Margaret Mcmahon | 11 | Daughter | — | New York |
| 22 | Martin Mcmahon | 8 | Son | — | New York |
| 23 | Eleanora Mcmahon | 3 | Daughter | — | New York |
| 24 | Charles Okonko | 57 | Head | Porter | Austria |
| 25 | Ruby Okonko | 52 | Wife | — | Poland |
| 26 | Tony Okonko | 25 | Son | Clerk | New York |
| 27 | Charles Okonko | 23 | Son | Machinist | New York |
| 28 | Henry Okonko | 20 | Son | Machinist | New York |
| 29 | Mary Okonko | 12 | Daughter | — | New York |
| 30 | John Cellini | 43 | Head | Laborer | New York |
| 31 | Dorothy Cellini | 40 | Wife | — | New York |
| 32 | Virginia Cellini | 12 | Daughter | — | New York |
| 33 | Elsie Cellini | 10 | Daughter | — | New York |
| 34 | German Pavor | 40 | Head | Porter | Porto Rico |
| 35 | Catalina Pavor | 29 | Wife | — | Panama |
| 36 | German Pavor | 8 | Son | — | New York |
| 37 | Conrad Herrera | 30 | Head | — | Porto Rico |
| 38 | Yolanda Herrera | 3 | Daughter | — | New York |
| 39 | Frances Alomar | 57 | Mother | — | Porto Rico |
| 40 | Marco Riley | 33 | Head | Door Keeper | Porto Rico |
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)