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Mary Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Bergen-County, New Jersey
Our Model Tree links this Mary Monahan across the 1920, 1930 and 1940 US Censuses in Bergen-County, New Jersey (XGBoost, ~Confirmed) — first a spouse (b.~1898), then head of a 5-person household.
Age 42
b. ~1898
Female
Spouse
Born: New Jersey
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Bergen-County, New Jersey |
| Surname | Monahan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Fairview borough |
| 1935 Residence (County) | Bergen |
| Additional Details | |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Fairview Borough |
| Est. Birth Year | ~1898 |
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 |
|---|---|---|---|---|
| Mary Monahan | Spouse | — | 42 | ~1898 |
| James Monahan | Son | — | 19 | ~1921 |
| John Monahan | Son | — | 21 | ~1919 |
| Robert Monahan | Son | — | 12 | ~1928 |
| James Monahan | Head | — | 49 | ~1891 |
Census Appearances
1920
Bergen, New …
Spouse, age 23
Bergen, New Jersey · implied b. ~1897 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1930
Bergen, New …
Spouse, age 32
Bergen, New Jersey · implied b. ~1898 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | New Jersey |
| Age at First Marriage | 20 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Bergen-County, New …
Spouse, age 42
Bergen-County, New Jersey · implied b. ~1898 — 5 household members
| Surname | Monahan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | New Jersey |
| 1935 Residence (City) | Fairview borough |
| 1935 Residence (County) | Bergen |
| Hours Worked | 0 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 Monahan 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 Monahan
Spouse · 1940 · age 42 · b. ~1898 · 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 — Bergen-County, New Jersey
Open full size
1940 US Federal Census — Bergen-County, New Jersey
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02307-00457)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alfredo Persson | 56 | Head | — | Sweden |
| 2 | Lina Persson | 39 | Wife | Accountant | New Jersey |
| 3 | Eleanor Eleanos | 27 | Daughter | — | New York |
| 4 | Sandra Eleanos | 0 | Granddaughter | — | New Jersey |
| 5 | Elizabeth Edwards | 49 | Head | — | New York |
| 6 | Margaret Edwards | 25 | Niece | File Clerk | New Jersey |
| 7 | William Edwards | 24 | Nephew | File Clerk | Connecticut |
| 8 | Alfred Edwards | 21 | Nephew | Inst. | New Jersey |
| 9 | Leonard Edwards | 19 | Nephew | Operator | New Jersey |
| 10 | Daniel Celidonio | 47 | Head | Odd Jobs | Italy |
| 11 | Anna Celidonio | 44 | Wife | — | Italy |
| 12 | Connie Celidonio | 25 | Daughter | Laundress | New York |
| 13 | Dorothy Celidonio | 23 | Daughter | Laundress | New York |
| 14 | Joseph Celidonio | 20 | Son | New Worker | New York |
| 15 | Eva Celidonio | 18 | Daughter | Packer | New York |
| 16 | Helen Celidonio | 14 | Daughter | — | New York |
| 17 | John Celidonio | 12 | Son | — | New York |
| 18 | Robert Celidonio | 8 | Son | — | New York |
| 19 | Donald Celidonio | 4 | Son | — | New Jersey |
| 20 | John C. Julier | 48 | Head | Stationery Engineer | Illinois |
| 21 | Virginia Julier | 38 | Wife | — | New York |
| 22 | John Buerer | 36 | Head | Button Cutter | New Jersey |
| 23 | Pauline Buerer | 29 | Wife | — | New Jersey |
| 24 | Carole Buerer | 1 | Daughter | — | New Jersey |
| 25 | Peter Gaetano | 64 | Head | Shoe Repairer | Italy |
| 26 | Marguerite Gaetano | 65 | Wife | — | Italy |
| 27 | Madeline Waters | 35 | Daughter | Operate Machines | Italy |
| 28 | James Monahan | 49 | Head | Janitor | New Jersey |
| 29 | Mary Monahan THIS PERSON | 42 | Wife | — | New Jersey |
| 30 | John Monahan | 21 | Son | Chemist Helper | New Jersey |
| 31 | James Monahan | 19 | Son | Truck Loader | New Jersey |
| 32 | Robert Monahan | 12 | Son | — | New Jersey |
| 33 | Colin Adair | 31 | Head | Truck Driver | New Jersey |
| 34 | Edith Adair | 31 | Wife | — | New York |
| 35 | Robert Adair | 0 | Son | — | New Jersey |
| 36 | Joseph Oratio | 67 | Head | Odd Jobs | Italy |
| 37 | Nicholetta Oratio | 64 | Wife | — | Italy |
| 38 | Mary Oratio | 39 | Daughter | Typist | New York |
| 39 | Mildred Oratio | 38 | Daughter | Packer | New York |
| 40 | Anna Oratio | 36 | Daughter | Packer | New York |
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)