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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 1900, 1910 and 1920 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a head (b.~1868), then head of a 5-person household.
Age 52
b. ~1868
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 | 52 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1880 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Washing |
| Industry | Cleaning |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1885 |
| Birthplace (normalized) | ireland |
| Occupation | Washing |
| Township / Ward | New York City |
| Est. Birth Year | ~1868 |
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.
5 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Catherine Mcmahon | Daughter | — | 21 | ~1899 |
| Helen Mcmahon | Daughter | — | 16 | ~1904 |
| Mary Mcmahon | Head | — | 52 | ~1868 |
| John Mcmahon | Son | — | 17 | ~1903 |
| Albert Mcmahon | Son | — | 11 | ~1909 |
Census Appearances
1900
New York, …
Head, age 36
New York, New York · implied b. ~1864 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Ireland |
| Birth Month | Apr |
| Birth Year | 1864 |
| Year of Immigration | 1883 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Servant |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1910
New York, …
Head, age 44
New York, New York · implied b. ~1866 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Children Born | 8 |
| Children Living | 7 |
| Year of Immigration | 1880 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1920
New York, …
Head, age 52
New York, New York · implied b. ~1868 — 5 household members
| Surname | McMahon |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1880 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Washing |
| Industry | Cleaning |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Home Owned/Rented | R |
| Birth Country | Ireland |
| Year of Naturalization | 1885 |
| 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 (1900, 1910 and 1920) in New York, New York, using XGBoost record linkage.
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This person
Anchor record
Mary Mcmahon
Head · 1920 · age 52 · b. ~1868 · 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:1920:14thcensusofpopu1224unit:0052)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ethel Hauer | 23 | Wife | — | New Jersey |
| 2 | William Hauer | 3 | Son | — | New York |
| 3 | Robert W. Hauer | 1 | Son | — | New York |
| 4 | Mary Mcmahon THIS PERSON | 52 | Head | Washing | Ireland |
| 5 | Catherine Mcmahon | 21 | Daughter | Tracer | New York |
| 6 | John Mcmahon | 17 | Son | Printer | New York |
| 7 | Helen Mcmahon | 16 | Daughter | Telephone Op | New York |
| 8 | Albert Mcmahon | 11 | Son | — | New York |
| 9 | Mary Warmuth | 77 | Head | — | Germany |
| 10 | Matilda Warmuth | 35 | Daughter | Manicure | New York |
| 11 | John Rielley | 50 | Head | Carpenter | New York |
| 12 | Mary Rielley | 48 | Wife | — | New York |
| 13 | Charles Rielley | 30 | Son | Machinist | New York |
| 14 | John W. Rielley | 24 | Son | Plumber | New York |
| 15 | Walter Burns | 20 | Nephew | Clerk | New York |
| 16 | Maurice Solomon | 60 | Head | Butcher | Warsaw |
| 17 | Lena Solomon | 38 | Wife | — | Warsaw |
| 18 | Leonard Solomon | 21 | Son | Advertiser | New York |
| 19 | Jacob Bustein | 21 | Lodger | Clerk | Russia |
| 20 | William Ross | 64 | Head | Fireman | France |
| 21 | Herman Koopman | 31 | Head | Conductor | New York |
| 22 | Marie Koopman | 40 | Wife | — | Germany |
| 23 | John Koopman | 5 | Son | — | New York |
| 24 | William Koopman | 2 | Son | — | New York |
| 25 | Sophie Koopman | 66 | Mother | — | Germany |
| 26 | Jane Jervis | 60 | Head | Housekeeper | Scotland |
| 27 | Amy Jervis | 20 | Daughter | Telephone Op | Scotland |
| 28 | Gustave Matz | 49 | Head | Shipbuilder | Germany |
| 29 | Mollie Matz | 53 | Wife | Janitress | Germany |
| 30 | Henry Matz | 25 | Son | Shipbuilder | New York |
| 31 | Jacob Ilesky | 83 | Head | Physician | Germany |
| 32 | Cecilia Ilesky | 75 | Wife | — | Germany |
| 33 | Bernard Lovely | 37 | Head | Manager | Ireland |
| 34 | Nora Lovely | 35 | Wife | — | Pittsburgh |
| 35 | Catherine Clearwater | 46 | Head | Housework | Ireland |
| 36 | Arthur F. Smyth | 24 | Lodger | Salesman | New York |
| 37 | Florence Smyth | 21 | Lodger | Saleswoman | New York |
| 38 | John F. Connors | 32 | Head | Letter Carrier | New York |
| 39 | Margaret Connors | 33 | Wife | — | New Jersey |
| 40 | Elizabeth Connors | 6 | Daughter | — | New York |
| 41 | Margaret Connors | 66 | Mother | — | Ireland |
| 42 | Arthur Tobing | 27 | Lodger | Carpenter | New York |
| 43 | William F. Ryan | 61 | Head | Janitor | New York |
| 44 | Elizabeth Ryan | 57 | Wife | — | Ireland |
| 45 | John Parkinson | 66 | Head | Elevator Op | England |
| 46 | Mary Parkinson | 62 | Wife | — | Scotland |
| 47 | James Gaffney | 25 | Daughter | Saleswoman | New York |
| 48 | Frank Gaffney | 26 | Son-in-law | Trucking | New York |
| 49 | Kathleen Gaffney | 3 | Granddaughter | — | New York |
| 50 | Eleanor Mechelen | 75 | Head | — | 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)