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John Mcmahon — 1920 US Census Record
Linked across censuses1920 United States Federal Census · New York, New York
Our Model Tree links this John Mcmahon across the 1900, 1910 and 1920 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 3-person household.
Age 54
b. ~1866
Male
Head
Born: Ireland
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | New York, New York |
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1883 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Foreman |
| Industry | Construction |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1918 |
| Birthplace (normalized) | ireland |
| Occupation | Foreman |
| Township / Ward | Borough Of Manhattan |
| Est. Birth Year | ~1866 |
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 1920 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Marguerite Mcmahon | Daughter | — | 12 | ~1908 |
| John Mcmahon | Head | — | 54 | ~1866 |
| Marguerite Mcmahon | Spouse | — | 52 | ~1868 |
Census Appearances
1900
New York, …
Head, age 35
New York, New York · implied b. ~1865 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Ireland |
| Birth Month | Mch |
| Birth Year | 1865 |
| Year of Immigration | 1880 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Iron Rail Worker |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1910
New York, …
Head, age 43
New York, New York · implied b. ~1867 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Ireland |
| Years Married | 13 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Policeman |
| Industry | City |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1920
New York, …
Head, age 54
New York, New York · implied b. ~1866 — 3 household members
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1883 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Foreman |
| Industry | Construction |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1918 |
| 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 (1900, 1910 and 1920) in New York, New York, using XGBoost record linkage.
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This person
Anchor record
John Mcmahon
Head · 1920 · age 54 · b. ~1866 · New York
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — New York, New York
Open full size
1920 US Federal Census — New York, New York
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1225unit:0513)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | James Griffin | 36 | Head | Conductor | New York |
| 52 | Delia Griffin | 31 | Wife | None | Ireland |
| 53 | James Griffin | 5 | Son | None | New York |
| 54 | Virginia Griffin | 4 | Daughter | None | New York |
| 55 | Frederick Griffin | 1 | Daughter | None | New York |
| 56 | Sam Bergin | 28 | Head | Painter | Russia |
| 57 | Pearl Bergin | 22 | Wife | None | Russia |
| 58 | Sylvia Bergin | 2 | Daughter | None | New York |
| 59 | Steven Freeman | 53 | Head | Wood Finisher | Maryland |
| 60 | Gertrude Freeman | 49 | Wife | Dressmaker | New York |
| 61 | Joseph Freeman | 20 | Son | Electrician | New York |
| 62 | Marguerite Freeman | 15 | Daughter | Saleslady | New York |
| 63 | John Mcmahon THIS PERSON | 54 | Head | Foreman | Ireland |
| 64 | Marguerite Mcmahon | 52 | Wife | None | Ireland |
| 65 | Marguerite Mcmahon | 12 | Daughter | None | New York |
| 66 | Edward Stone | 45 | Head | Conductor | Canada |
| 67 | Elizabeth Stone | 49 | Wife | None | New York |
| 68 | Francis Septtaiguet | 56 | Head | Clerk | France |
| 69 | Antonie Septtaiguet | 30 | Wife | None | Germany |
| 70 | Gloria Septtaiguet | 1 | Daughter | None | New York |
| 71 | Thomas Moran | 40 | Head | Conductor | Ireland |
| 72 | Marie Moran | 40 | Wife | None | Ireland |
| 73 | Mary Moran | 15 | Daughter | None | New York |
| 74 | John Moran | 13 | Son | None | New York |
| 75 | William Gunn | 40 | Head | Secretary | Baltimore |
| 76 | Mary Gunn | 36 | Wife | None | Ireland |
| 77 | Jacob Rottman | 17 | Step Son | Iron Layer | New York |
| 78 | Rita Gunn | 0 | Daughter | None | New York |
| 79 | Adrian Schneider | 39 | Head | Waiter | Switzerland |
| 80 | Eugenie Schneider | 28 | Wife | None | Switzerland |
| 81 | Roland Schneider | 9 | Son | None | New York |
| 82 | George Givarega | 33 | Head | Mechanic | New York |
| 83 | Pearl Givarega | 25 | Wife | None | New York |
| 84 | Peter Cottorelli | 38 | Head | Newsdealer | Italy |
| 85 | Mary Cottorelli | 35 | Wife | None | Italy |
| 86 | James Cottorelli | 12 | Son | None | New York |
| 87 | Mary Cottorelli | 13 | Daughter | None | New York |
| 88 | Florence Cottorelli | 10 | Daughter | None | New York |
| 89 | Peter Cottorelli | 7 | Son | None | New York |
| 90 | Thomas Smith | 45 | Head | Ticket Agent | Ireland |
| 91 | Elizabeth Smith | 39 | Wife | None | Ireland |
| 92 | Margaret Smith | 19 | Daughter | Dressmaker | New York |
| 93 | Max Kaufman | 51 | Head | Newsdealer | Russia |
| 94 | Eva Kaufman | 51 | Wife | None | Russia |
| 95 | Morris Kaufman | 23 | Son | Painter | New York |
| 96 | Esther Kaufman | 20 | Daughter | None | New York |
| 97 | Joseph Kaufman | 17 | Son | Pattern Maker | New York |
| 98 | Gerald Kaufman | 15 | Son | None | New York |
| 99 | Leon Kaufman | 13 | Son | None | New York |
| 100 | Lida Kaufman | 10 | Daughter | None | New York |
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)