ML
Mary Leahy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · New York, New York
Our Model Tree links this Mary Leahy across the 1920, 1930 and 1940 US Censuses in New York, New York (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 4-person household.
Age 50
b. ~1880
Female
Head
Born: Ireland
Widowed
1930 Census Record Details
| Census Year | 1930 |
| Location | New York, New York |
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1900 |
| Age at First Marriage | 30 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Maid |
| Industry | Private |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 22 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Maid |
| Township / Ward | Manhattan Borough |
| Est. Birth Year | ~1880 |
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 |
|---|---|---|---|---|
| Winifred Leahy | Daughter | — | 18 | ~1912 |
| Mary Leahy | Head | — | 50 | ~1880 |
| Mary Leahy | Daughter | — | 15 | ~1915 |
| Thomas Datter | Other | — | 30 | ~1900 |
Census Appearances
1920
New York, …
Head, age 40
New York, New York · implied b. ~1880 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Year of Immigration | 1896 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laundress |
| Industry | Laundry |
| Class of Worker | W |
| 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, …
Head, age 50
New York, New York · implied b. ~1880 — 4 household members
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1900 |
| Age at First Marriage | 30 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Maid |
| Industry | Private |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | R |
| Home Value / Rent | 22 |
| Radio Set | R |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Suffolk-County, New …
Other, age 61
Suffolk-County, New York · implied b. ~1879 — 40 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Inmate |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Single |
| Birthplace | Ireland |
| 1935 Residence (City) | New York |
| Naturalization Status | Naturalized |
| Highest Grade | No 8 |
| 1935 Residence | New York |
| 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 Leahy 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 Leahy
Head · 1930 · age 50 · b. ~1880 · New York
★ You are viewing this record
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
48 people indexed on this census page (ia:1930:newyorkcensus00reel1557:1011)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Margaret Powers | 6 | Daughter | — | New York |
| 52 | Nellie Powers | 5 | Daughter | — | New York |
| 53 | Annie Powers | 4 | Daughter | — | New York |
| 54 | Catherine Powers | 2 | Daughter | — | New York |
| 55 | Elizabeth Powers | 1 | Daughter | — | New York |
| 56 | George Ernest | 45 | Head | Waiter | New York |
| 57 | Christopher Ernest | 10 | Son | — | New York |
| 58 | Mary Leahy THIS PERSON | 50 | Head | Maid | Ireland |
| 59 | Winifred Leahy | 18 | Daughter | — | New York |
| 60 | Mary Leahy | 15 | Daughter | — | New York |
| 61 | Thomas Datter | 30 | Nephew | Guard | Ireland |
| 62 | Dora Reamer | 45 | Head | — | Ireland |
| 63 | Thomas Sweeney | 26 | Boarder | Helper | Ireland |
| 64 | James Relating | 28 | Boarder | Letter Carrier | Ireland |
| 65 | Patrick Griffin | 28 | Boarder | Fireman | Ireland |
| 66 | Mary Mcgrath | 40 | Head | Bookbinder | Ireland |
| 67 | Hester Peters | 34 | Head | Saleslady | New York |
| 68 | Anna Peters | 63 | Mother | Laundress | Sweden |
| 69 | Henry Schutter | 47 | Head | — | New York |
| 70 | Lillian Schutter | 47 | Wife | Housewife | New York |
| 71 | Henry Schutter | 15 | Son | — | New York |
| 72 | John Whelan | 53 | Head | Watchman | Ireland |
| 73 | Jane Whelan | 50 | Wife | — | Ireland |
| 74 | John Conway | 50 | Head | Digger | Ireland |
| 75 | Nellie Conway | 45 | Wife | — | Ireland |
| 76 | Rose Conway | 20 | Daughter | Bookkeeper | New York |
| 77 | James Conway | 22 | Son | Instructor | New York |
| 78 | Joseph Conway | 24 | Son | Chauffeur | New York |
| 79 | John Walsh | 26 | Head | Laborer | Ireland |
| 80 | Nellie Walsh | 24 | Wife | Chambermaid | Ireland |
| 81 | Patrick Rogers | 31 | Brother | Keeper | Ireland |
| 82 | Josephine Rogers | 21 | Sister | — | Ireland |
| 83 | Catherine Gribley | 20 | Boarder | Chambermaid | Ireland |
| 84 | John T. Allen | 69 | Head | Trainman | New York |
| 85 | James T. Allen | 45 | Son | Clerk | New York |
| 86 | John Conlon | 27 | Head | — | Conn. |
| 87 | Ellen Conlon | 45 | Sister | Housekeeper | Conn. |
| 88 | James Irwin | 31 | Head | Laborer | Ireland |
| 89 | Mary Irwin | 29 | Wife | — | Ireland |
| 90 | Myles Irwin | 23 | Brother | Helper | Ireland |
| 91 | Hugh Irwin | 26 | Brother | Laborer | Ireland |
| 92 | Elizabeth Reeley | 21 | Boarder | Nurse | Ireland |
| 93 | Michael Burns | 29 | Boarder | Helper | Ireland |
| 94 | Edward James | 55 | Head | Laborer | Ireland |
| 95 | John Moriarty | 40 | Head | Chauffeur | New York |
| 96 | Betty Moriarty | 33 | Wife | — | Germany |
| 97 | Mary Moriarty | 5 | Daughter | — | New York |
| 98 | Dorothy Moriarty | 1 | Daughter | — | 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)