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Mary Mcmahon — 1920 US Census Record
Linked across censuses1920 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.~1872), then head of a 9-person household.
Age 48
b. ~1872
Female
Head
Born: Ireland
Widowed
1920 Census Record Details
| Census Year | 1920 |
| Location | New York, New York |
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | N Y City |
| Est. Birth Year | ~1872 |
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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Sarah Mcmahon | Daughter | — | 21 | ~1899 |
| Winifred Mcmahon | Daughter | — | 10 | ~1910 |
| Margaret Mcmahon | Daughter | — | 19 | ~1901 |
| Rose Mcmahon | Daughter | — | 17 | ~1903 |
| Anna Mcmahon | Daughter | — | 8 | ~1912 |
| Mary Mcmahon | Head | — | 48 | ~1872 |
| Andrew Mcmahon | Son | — | 7 | ~1913 |
| James Mcmahon | Son | — | 12 | ~1908 |
| Edward Mcmahon | Son | — | 15 | ~1905 |
Census Appearances
1920
New York, …
Head, age 48
New York, New York · implied b. ~1872 — 9 household members
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
New York, …
Other, age 56
New York, New York · implied b. ~1874 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Mother |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1887 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Caretaker |
| Industry | Rooming house |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
New-York-County, New …
Other, age 65
New-York-County, New York · implied b. ~1875 — 26 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Lodger |
| Sex | F |
| Color / Race | White |
| Age | 65 |
| Marital Status | Single |
| Birthplace | Ireland |
| 1935 Residence (City) | Manhattan Borough |
| 1935 Residence (County) | New York |
| Naturalization Status | Naturalized |
| Occupation | Domestic |
| Class of Worker | PW |
| Hours Worked | 0 |
| Income (1939) | 220 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| 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 · 1920 · age 48 · b. ~1872 · New York
★ You are viewing this record
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:1920:14thcensusofpopu1189unit:0817)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Charles Mandel | 38 | Head | Tailor | Russia |
| 52 | Fannie Mandel | 36 | Wife | — | Russia |
| 53 | Irving Mandel | 11 | Son | — | New York |
| 54 | Joseph Lorch | 40 | Boarder | Tailor | Austria |
| 55 | Ludwig Lorch | 38 | Boarder | Tailor | Austria |
| 56 | Rose Mandel | 28 | Wife | — | Russia |
| 57 | James Mchugh | 50 | Head | Laborer | Ireland |
| 58 | Margaret Mchugh | 48 | Wife | — | Ireland |
| 59 | James Mchugh | 21 | Son | — | New York |
| 60 | Ignatius Smith | 24 | Head | Driver | New York |
| 61 | Gertrude Smith | 21 | Wife | — | New York |
| 62 | William Smith | 1 | Son | — | New York |
| 63 | Helen Mccourt | 18 | Sister-in-law | Packer | New York |
| 64 | James Foye | 40 | Head | Laborer | Ireland |
| 65 | Nellie Foye | 38 | Wife | — | Ireland |
| 66 | Thomas Foye | 12 | Son | — | New York |
| 67 | Florence Foye | 10 | Daughter | — | New York |
| 68 | James Foye | 8 | Son | — | New York |
| 69 | Helen Foye | 6 | Daughter | — | New York |
| 70 | Alice Foye | 5 | Daughter | — | New York |
| 71 | Joseph Foye | 3 | Son | — | New York |
| 72 | Catherine Foye | 1 | Daughter | — | New York |
| 73 | Mary Foye | 0 | Daughter | — | New York |
| 74 | Richard Kennedy | 41 | Head | Driver | Ireland |
| 75 | Bridget Kennedy | 37 | Wife | — | Ireland |
| 76 | Richard Kennedy | 14 | Son | — | New York |
| 77 | James Kennedy | 12 | Son | — | New York |
| 78 | John Kennedy | 10 | Son | — | New York |
| 79 | Thomas Kennedy | 8 | Son | — | New York |
| 80 | Francis Kennedy | 6 | Son | — | New York |
| 81 | Patrick Kennedy | 4 | Son | — | New York |
| 82 | Margaret Kennedy | 2 | Daughter | — | New York |
| 83 | Catherine Kennedy | 0 | Daughter | — | New York |
| 84 | Mary Kennedy | 0 | Daughter | — | New York |
| 85 | Joseph Kennedy | 0 | Son | — | New York |
| 86 | Alice Kennedy | 0 | Daughter | — | New York |
| 87 | Patrick Mcmahon | 51 | Head | Laborer | Ireland |
| 88 | Hannah Mcmahon | 43 | Wife | — | Ireland |
| 89 | Margaret Mcmahon | 21 | Daughter | — | New York |
| 90 | Helen Mcmahon | 19 | Daughter | — | New York |
| 91 | Alice Mcmahon | 17 | Daughter | — | New York |
| 92 | Mary Mcmahon THIS PERSON | 48 | Head | — | Ireland |
| 93 | Sarah Mcmahon | 21 | Daughter | — | New York |
| 94 | Margaret Mcmahon | 19 | Daughter | Clerk | New York |
| 95 | Rose Mcmahon | 17 | Daughter | Clerk | New York |
| 96 | Edward Mcmahon | 15 | Son | — | New York |
| 97 | James Mcmahon | 12 | Son | — | New York |
| 98 | Winifred Mcmahon | 10 | Daughter | — | New York |
| 99 | Anna Mcmahon | 8 | Daughter | — | New York |
| 100 | Andrew Mcmahon | 7 | Son | — | 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)