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James Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · New York, New York
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a head (b.~1878), then head of a 8-person household.
Age 52
b. ~1878
Male
Head
Born: New York
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | New York, New York |
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | New York |
| Age at First Marriage | 26 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Retired |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 110 |
| Radio Set | R |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Retired |
| Township / Ward | New York City |
| Est. Birth Year | ~1878 |
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 1930 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Hannah Mcmahon | Daughter | — | 22 | ~1908 |
| Margaret Mcmahon | Daughter | — | 17 | ~1913 |
| Mary Mcmahon | Daughter | — | 20 | ~1910 |
| James Mcmahon | Head | — | 52 | ~1878 |
| William Mcmahon | Son | — | 18 | ~1912 |
| Charles Mcmahon | Son | — | 14 | ~1916 |
| John Mcmahon | Son | — | 25 | ~1905 |
| Margaret Mcmahon | Spouse | — | 44 | ~1886 |
Census Appearances
1920
New York, …
Head, age 41
New York, New York · implied b. ~1879 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | New York |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Superintendent |
| Industry | Concert |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
New York, …
Head, age 52
New York, New York · implied b. ~1878 — 8 household members
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | New York |
| Age at First Marriage | 26 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Retired |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 110 |
| Radio Set | R |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
New-York-County, New …
Other, age 62
New-York-County, New York · implied b. ~1878 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | MCMAHON |
| Given Name | JAMES |
| Relationship to Head | LODGER |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Single |
| Birthplace | NEW YORK |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | New York |
| Occupation | STEAM FITTER |
| Industry | CONSTRUCTION CO |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 2000 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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.
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This person
Anchor record
James Mcmahon
Head · 1930 · age 52 · b. ~1878 · New York
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — New York, New York
Open full size
1930 US Federal Census — New York, New York
Page Contents
50 people indexed on this census page (ia:1930:newyorkcensus00reel1577:0138)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Charles R. Roeder | 50 | Head | Superintendent | Germany |
| 52 | Clara Roeder | 41 | Wife | — | Germany |
| 53 | Eleanor Roeder | 17 | Daughter | — | New York |
| 54 | Charles Roeder | 23 | Son | Assistant | New York |
| 55 | Thomas Egan | 30 | Head | Chauffeur | New York |
| 56 | Estelle Egan | 30 | Wife | — | New York |
| 57 | Joan Egan | 4 | Daughter | — | New York |
| 58 | Julia Boyle | 51 | Mother-in-law | Saleswoman | New York |
| 59 | William Boyle | 13 | Brother-in-law | — | New York |
| 60 | Edward Hall | 32 | Head | Porter | Virginia |
| 61 | John Joseph | 60 | Roomer | Fireman | West Indies |
| 62 | Herman Wolff | 58 | Head | Buyer | New York |
| 63 | Florence Wolff | 52 | Wife | — | New York |
| 64 | Morris Joseph | 51 | Boarder | Mechanic | New York |
| 65 | William Wolff | 53 | Head | Stock Broker | Massachusetts |
| 66 | Katherine Wolff | 43 | Wife | — | Kansas |
| 67 | Harry S. Coleman | 34 | Head | Salesman | Russia |
| 68 | Frances Coleman | 32 | Wife | — | Illinois |
| 69 | Marjorie Coleman | 5 | Daughter | — | Illinois |
| 70 | Louis Coleman | 54 | Uncle | Compositor | Russia |
| 71 | James Mcmahon THIS PERSON | 52 | Head | Retired | New York |
| 72 | Margaret Mcmahon | 44 | Wife | Retired | Ireland |
| 73 | John Mcmahon | 25 | Son | Detective | New York |
| 74 | Hannah Mcmahon | 22 | Daughter | Operator | New York |
| 75 | Mary Mcmahon | 20 | Daughter | Clerical | New York |
| 76 | William Mcmahon | 18 | Son | Clerk | New York |
| 77 | Margaret Mcmahon | 17 | Daughter | Operator | New York |
| 78 | Charles Mcmahon | 14 | Son | — | New York |
| 79 | Bertha Lata | 67 | Head | — | Maryland |
| 80 | Maud L. Ellis | 35 | Daughter | Secretary | New York |
| 81 | Adolph Lyman | 88 | Head | Retired | Germany |
| 82 | Sophie Lyman | 52 | Daughter | — | New York |
| 83 | Leah Lyman | 48 | Daughter | Secretary | New York |
| 84 | Marianne Pinguis | 16 | Granddaughter | — | New York |
| 85 | Elizabeth Rodgers | 53 | Head | — | Massachusetts |
| 86 | Edward J. Rodgers | 33 | Son | Salesman | Pennsylvania |
| 87 | William L. Rodgers | 29 | Son | Broker | Pennsylvania |
| 88 | Albert A. Lucas | 81 | Head | Retired | Maine |
| 89 | Clara E. Lucas | 65 | Wife | — | Ireland |
| 90 | Millard Smith | 36 | Head | Salesman | Minnesota |
| 91 | Lilly E. Gallon | 53 | Head | Teacher | Canada |
| 92 | Richard S. Gallon | 24 | Son | Clerical | Canada |
| 93 | Francis J. Gallon | 22 | Son | Clerical | Canada |
| 94 | Thomas Dunn | 25 | Head | Electrician | West Virginia |
| 95 | Juliana Dunn | 20 | Wife | — | New York |
| 96 | Regina Rothschild | 50 | Head | — | New York |
| 97 | Lucille Rothschild | 22 | Daughter | Secretary | New York |
| 98 | Harry Silberman | 46 | Head | Salesman | New York |
| 99 | Stella Silberman | 46 | Wife | — | New York |
| 100 | Dorothy F. Cooper | 36 | Head | Laboratory | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)