MC
Mary Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Essex-County, New Jersey
Our Model Tree links this Mary Cahill across the 1920, 1930 and 1940 US Censuses in Essex-County, New Jersey (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 5-person household.
Age 56
b. ~1884
Female
Head
Born: Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, New Jersey |
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Irvington |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Domestic |
| Industry | Housework |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 300 |
| Highest Grade | H 8 |
| 1935 Residence | Same house |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Domestic |
| Township / Ward | Irvington |
| Est. Birth Year | ~1884 |
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 Wilson | Daughter | — | 27 | ~1913 |
| Mary Cahill | Head | — | 56 | ~1884 |
| William Hewitt | Other | — | 55 | ~1885 |
| Robert Wilson | Other | — | 29 | ~1911 |
| Jennie Cahill | Daughter | — | 21 | ~1919 |
Census Appearances
1920
Essex, New …
Spouse, age 35
Essex, New Jersey · implied b. ~1885 — 12 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Ireland |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Bergen, New …
Spouse, age 46
Bergen, New Jersey · implied b. ~1884 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1916 |
| Age at First Marriage | 23 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | German |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Essex-County, New …
Head, age 56
Essex-County, New Jersey · implied b. ~1884 — 5 household members
| Surname | Cahill |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Widowed |
| Birthplace | Ireland |
| 1935 Residence (City) | Irvington |
| 1935 Residence (County) | Essex |
| Naturalization Status | Naturalized |
| Occupation | Domestic |
| Industry | Housework |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 300 |
| Highest Grade | H 8 |
| 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 Cahill across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Cahill
Head · 1940 · age 56 · b. ~1884 · New Jersey
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Essex-County, New Jersey
Open full size
1940 US Federal Census — Essex-County, New Jersey
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-02334-00943)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Scherer | 35 | Head | Painter | Germany |
| 42 | Anna Scherer | 31 | Wife | — | NJ |
| 43 | Dora A Silz | 59 | Head | — | Austria |
| 44 | Harry H Silz | 38 | Son | Routeman | Missouri |
| 45 | Leo F Silz | 22 | Son | Clerk | Ohio |
| 46 | Mary Cahill THIS PERSON | 56 | Head | Domestic | Ireland |
| 47 | Jennie Cahill | 21 | Daughter | Domestic | NJ |
| 48 | Robert S Wilson | 29 | Son-in-law | Baker | Penna |
| 49 | Margaret Wilson | 27 | Daughter | — | NJ |
| 50 | William E Hewitt | 55 | Lodger | Bookkeeper | NJ |
| 51 | Samuel A Bear | 47 | Head | Salesman | Austria |
| 52 | Rose Bear | 44 | Wife | — | NJ |
| 53 | Allan H Bear | 20 | Son | Clerk | NJ |
| 54 | Albert C Myers | 28 | Head | Inspector | New York |
| 55 | Dorothea E Myers | 27 | Wife | Clerk | NJ |
| 56 | Lillian M Tuffree | 57 | Head | Bookkeeper | NJ |
| 57 | John Vibaw | 26 | Head | Bottler | NJ |
| 58 | Emma Vibaw | 25 | Wife | — | NJ |
| 59 | Herbert Vibaw | 4 | Son | — | — |
| 60 | Herbert Vibaw | 1 | Son | — | — |
| 61 | Herbert Vibaw | 0 | Son | — | — |
| 62 | Cornelius Wigler | 59 | Head | Sexton | NJ |
| 63 | Evelyn F Wigler | 54 | Wife | — | NJ |
| 64 | Frances S Wigler | 27 | Daughter | Clerk | NJ |
| 65 | Fred Peters | 80 | Head | Machinist | Germany |
| 66 | Rose Peters | 48 | Daughter | — | NJ |
| 67 | Joseph Hawkins | 31 | Head | Lensmaker | NJ |
| 68 | Rachel Hawkins | 36 | Wife | Presshand | NJ |
| 69 | Paul Munger | 45 | Head | Inspector | NJ |
| 70 | Clara Munger | 46 | Wife | — | NJ |
| 71 | Robert Munger | 4 | Son | — | — |
| 72 | Hans Theken | 36 | Head | Polisher | Germany |
| 73 | Else Theken | 34 | Wife | Buffer | Germany |
| 74 | Walter K Leck | 26 | Head | Postal Clerk | NJ |
| 75 | Grace M Leck | 24 | Wife | — | NJ |
| 76 | Walter W Leck | 3 | Son | — | — |
| 77 | Alfred Rissland | 58 | Head | Watch Repair | Germany |
| 78 | Anna Rissland | 51 | Wife | Clerk | Germany |
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)