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Mary Mcmahon — 1930 US Census Record
Linked across censuses1930 United States Federal Census · New York, New York
Our Model Tree links this Mary Mcmahon across the 1920, 1930 and 1940 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a head (b.~1875), then head of a 4-person household.
Age 55
b. ~1875
Female
Head
Born: Ireland
Widowed
1930 Census Record Details
| Census Year | 1930 |
| Location | New York, New York |
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1900 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 20.00 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | New York |
| Est. Birth Year | ~1875 |
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.
4 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcmahon | Daughter | — | 32 | ~1898 |
| Irene Mcmahon | Daughter | — | 28 | ~1902 |
| Mary Mcmahon | Head | — | 55 | ~1875 |
| John Mcmahon | Son | — | 21 | ~1909 |
Census Appearances
1920
New York, …
Head, age 45
New York, New York · implied b. ~1875 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1892 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Year of Naturalization | R |
| Birthplace (normalized) | ireland |
1930
New York, …
Head, age 55
New York, New York · implied b. ~1875 — 4 household members
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1900 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 20.00 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
New-York-County, New …
Other, age 62
New-York-County, New York · implied b. ~1878 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Mother |
| Sex | F |
| Color / Race | White |
| Age | 62 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | New York |
| 1935 Residence (County) | New York |
| Naturalization Status | Naturalized |
| Highest Grade | No 0 |
| 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 Mary 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
Mary Mcmahon
Head · 1930 · age 55 · b. ~1875 · 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
47 people indexed on this census page (ia:1930:newyorkcensus00reel1575:0372)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 52 | Richard Volkman | 15 | Son | None | New York |
| 55 | William Volkman | 6 | Son | None | New York |
| 56 | Julius Adler | 44 | Head | Laborer | Poland |
| 57 | Hedwig Adler | 38 | Wife | None | Germany |
| 58 | Edna Lang | 19 | Niece | Waitress | Germany |
| 59 | Mary Mcmahon THIS PERSON | 55 | Head | None | Ireland |
| 60 | Mary A. Mcmahon | 32 | Daughter | Typewriter | New York |
| 61 | Irene T. Mcmahon | 28 | Daughter | None | New York |
| 62 | John Mcmahon | 21 | Son | Laborer | Ireland |
| 63 | Arthur Mcburney | 68 | Head | Oiler | Ireland |
| 64 | Alice Mcburney | 66 | Wife | None | Ireland |
| 65 | Samuel Sweet | 50 | Head | Commercial | Russia |
| 66 | Morris Meyer | 40 | Head | None | New York |
| 67 | Rose Meyer | 37 | Wife | Caretaker | Czechoslovakia |
| 68 | Lillian Meyer | 13 | Daughter | None | New York |
| 69 | Margaret Meyer | 10 | Daughter | None | New York |
| 70 | William Meyer | 8 | Son | None | New York |
| 71 | Pearl M. Meyer | 7 | Daughter | None | New York |
| 72 | Pauline Meyer | 4 | Daughter | None | New York |
| 73 | Michael Sullivan | 50 | Head | Caretaker | Canada |
| 74 | Catherine Sullivan | 50 | Wife | House Wife | Canada |
| 75 | Michael H. Sullivan | 8 | Son | None | New York |
| 76 | Samuel Bacon | 45 | Step Brother | Guard | Australia |
| 77 | Richard Fullner | 70 | Roomer | Interior Decor. | Germany |
| 78 | Peter Siba | 26 | Roomer | Chauffeur | France |
| 79 | Eric Withey | 27 | Roomer | Butcher | Germany |
| 80 | Thomas Kelley | 25 | Roomer | Chauffeur | Ireland |
| 81 | Joseph Kelly | 55 | Roomer | Watchman | Ireland |
| 82 | Dan Hubbard | 48 | Roomer | Painter | New York |
| 83 | William Sayer | 30 | Roomer | Iron Man | Ohio |
| 84 | Jacob Pollock | 60 | Roomer | Cutter | New York |
| 85 | Carl Gustafson | 40 | Roomer | Carpenter | Sweden |
| 86 | Joseph Lunn | 35 | Roomer | Coal Cake | Ireland |
| 87 | Harold Watt | 40 | Roomer | Inspector | Massachusetts |
| 88 | William J. Lamont | 49 | Roomer | Washer | Pennsylvania |
| 89 | Beatrice Lamont | 49 | Roomer | Cook | New York |
| 90 | Fred Babler | 21 | Roomer | Long Shore | New York |
| 91 | Sadie Martin | 38 | Roomer | Domestic | New York |
| 92 | Charles Schmitt | 62 | Head | Baker Master | France |
| 93 | Agnes Schmitt | 58 | Wife | Housework | Ireland |
| 94 | Thomas Wood | 54 | Roomer | Chauffeur | New York |
| 95 | Patrick Hartnett | 60 | Roomer | Laborer | Ireland |
| 96 | Thomas Moore | 51 | Roomer | Laborer | New York |
| 97 | Hugh Moore | 53 | Roomer | Detail | New York |
| 98 | Hugh Mcconnell | 35 | Roomer | Chauffeur | New York |
| 99 | Harry Berthant | 48 | Head | House Keeper | Bohemia |
| 100 | Richard Berthant | 24 | Son | Pipe Fitting | New York |
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)