MC
Mary Cahill — 1940 US Census Record
Model Tree available1940 United States Federal Census · Onondaga-County, New York
Our Model Tree links this Mary Cahill across the 1920, 1930 and 1940 US Censuses in Onondaga-County, New York (XGBoost, ~Confirmed), with identified parents Ernest & Mary — first a daughter (b.~1913), then head of a 5-person household.
Age 27
b. ~1913
Female
Daughter
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Onondaga-County, New York |
| Surname | Cahill |
| Given Name | Mary A. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Syracuse City |
| 1935 Residence (County) | Onondaga |
| Additional Details | |
| Occupation | stenographer |
| Industry | dept of public relief |
| Class of Worker | GW |
| Hours Worked | 39 |
| Income (1939) | 884 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Stenographer |
| Township / Ward | Syracuse City |
| Est. Birth Year | ~1913 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Cahill | Daughter | — | 26 | ~1914 |
| Mary Cahill | Spouse | — | 60 | ~1880 |
| James Cahill | Head | — | 60 | ~1880 |
| Mary Cahill | Daughter | — | 27 | ~1913 |
| Helen Cahill | Daughter | — | 23 | ~1917 |
Census Appearances
1920
Onondaga, New …
Daughter, age 7
Onondaga, New York · implied b. ~1913 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Onondaga, New …
Daughter, age 17
Onondaga, New York · implied b. ~1913 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary A. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Onondaga-County, New …
Daughter, age 27
Onondaga-County, New York · implied b. ~1913 — 5 household members
| Surname | Cahill |
| Given Name | Mary A. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Syracuse City |
| 1935 Residence (County) | Onondaga |
| Occupation | stenographer |
| Industry | dept of public relief |
| Class of Worker | GW |
| Hours Worked | 39 |
| Income (1939) | 884 |
| Highest Grade | Hs 4 |
| 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 Mary Cahill across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Ernest Cahill (~0.92 confidence) and mother Mary Cahill (~0.92 confidence) and father James Cahill (~0.92 confidence) and mother Mary Cahill (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Ernest Cahill
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Mary Cahill
b. ~1878
Source mother
● Household
· direct · ~0.92
Father
James Cahill
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Mary Cahill
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Cahill
Daughter · 1940 · age 27 · b. ~1913 · New York
★ You are viewing this record
Sibling
Helen Cahill
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Cahill
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Onondaga-County, New York
Open full size
1940 US Federal Census — Onondaga-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02855-00460)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arthur J. Jr. Cleary | 31 | son | Assistant Sales Manager | New York |
| 2 | Thomas M. Keating | 49 | head | Electrician | New York |
| 3 | Rose Keating | 47 | wife | — | Pennsylvania |
| 4 | Helen Keating | 23 | daughter | Nurse | New York |
| 5 | Robert Keating | 11 | son | — | New York |
| 6 | Jean Keating | 9 | daughter | — | New York |
| 7 | David Russell | 38 | head | Delivery Man | New York |
| 8 | Emma Russell | 36 | wife | — | New York |
| 9 | David Jr. Russell | 14 | son | — | New York |
| 10 | Eleanor Russell | 12 | daughter | — | New York |
| 11 | Emogene Russell | 11 | daughter | — | New York |
| 12 | Robert Russell | 9 | son | — | New York |
| 13 | Dolores Russell | 8 | daughter | — | New York |
| 14 | Audrey Russell | 4 | daughter | — | New York |
| 15 | Jerome Culkin | 31 | head | Generator Operator | Pennsylvania |
| 16 | Elizabeth Culkin | 29 | wife | — | New York |
| 17 | Robert Culkin | 6 | son | — | New York |
| 18 | Donald Culkin | 2 | son | — | New York |
| 19 | Mary Whelan | 51 | mother-in-law | House Keeper | New York |
| 20 | Phokion H. Halehas | 51 | head | Electrical Engineer | New York |
| 21 | Agnes M. Halehas | 51 | wife | — | New York |
| 22 | Leonard Halehas | 21 | son | Clerk | New York |
| 23 | Martin Joyce | 44 | head | Policeman | Pennsylvania |
| 24 | Alice Joyce | 42 | wife | — | Pennsylvania |
| 25 | Kathryn Joyce | 25 | daughter | Sales Clerk | Pennsylvania |
| 26 | Martin Jr. Joyce | 21 | son | Utility Man | Pennsylvania |
| 27 | Grace G. Garland | 58 | head | — | New York |
| 28 | Mary E. Garland | 24 | daughter | Stenographer | New York |
| 29 | Margaret B. Garland | 24 | daughter | Stenographer | New York |
| 30 | Patrick J. Rogers | 64 | head | Clerk | Free State Ireland |
| 31 | Jane Rogers | 60 | wife | — | Free State Ireland |
| 32 | Margaret Burke | 34 | lodger | Stenographer | New York |
| 33 | Cherie Rogers | 31 | daughter | Stenographer | New York |
| 34 | James Cahill | 60 | head | City Inspector Water Dept | New York |
| 35 | Mary Cahill | 60 | wife | — | New York |
| 36 | Mary A. Cahill THIS PERSON | 27 | daughter | Stenographer | New York |
| 37 | Margaret Cahill | 26 | daughter | — | New York |
| 38 | Helen Cahill | 23 | daughter | — | New York |
| 39 | George Klamm | 44 | head | Milkman | New York |
| 40 | Loretta Klamm | 44 | wife | — | New York |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)