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John Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Monahan across the 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 7-person household.
Age 16
b. ~1924
Male
Son
Born: Brooklyn
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Brooklyn |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H 1 |
| Birthplace (normalized) | brooklyn |
| Township / Ward | New York City |
| Est. Birth Year | ~1924 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Monahan | Spouse | — | 49 | ~1891 |
| Patricia Monahan | Daughter | — | 6 | ~1934 |
| Bernard Monahan | Son | — | 11 | ~1929 |
| Thomas Monahan | Son | — | 22 | ~1918 |
| John Monahan | Head | — | 52 | ~1888 |
| Eileen Monahan | Daughter | — | 13 | ~1927 |
| John Monahan | Son | — | 16 | ~1924 |
Census Appearances
1930
Kings, New …
Son, age 1
Kings, New York · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Brooklyn |
| Father's Birthplace | Brooklyn |
| Mother's Birthplace | Irish Free State |
| Birthplace (normalized) | brooklyn |
1940
Kings-County, New …
Son, age 16
Kings-County, New York · implied b. ~1924 — 7 household members
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Brooklyn |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Class of Worker | 0 |
| Highest Grade | H 1 |
| Birthplace (normalized) | brooklyn |
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 John Monahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Monahan
Son · 1940 · age 16 · b. ~1924 · New York
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Sibling
Bernard Monahan
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Monahan
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Monahan
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Monahan
Sibling · 1940 · age 13
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 — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02567-00852)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elaine Mccormack | 29 | Wife | — | Brooklyn |
| 2 | George Mccormack | 14 | Son | — | New York |
| 3 | Theodore Cambourakis | 69 | Head | Furrier | Greece |
| 4 | Eutrope Cambourakis | 49 | Wife | Furrier | Greece |
| 5 | Anna Cambourakis | 19 | Daughter | Furrier | Russia |
| 6 | Mary Cambourakis | 4 | Daughter | — | New York |
| 7 | George Dourlasis | 38 | Son-in-law | Apparatus | Italy |
| 8 | Irene Dourlasis | 24 | Daughter | — | Russia |
| 9 | Katherine Mcguire | 70 | Head | — | New York |
| 10 | Edith James | 39 | Niece | Bank | New York |
| 11 | William Brooks | 76 | Head | Retired | England |
| 12 | Kathleen Brooks | 49 | Wife | — | West Indies |
| 13 | Floyd Edick | 38 | Head | Shipyard | Black River, N.Y. |
| 14 | Lillian Edick | 37 | Wife | — | Montreal, Canada |
| 15 | Lillian Teresa Edick | 16 | Daughter | — | Lackawanna, N.Y. |
| 16 | William Edick | 14 | Son | — | Niagara Falls, N.Y. |
| 17 | Shirley Edick | 13 | Daughter | — | Montreal |
| 18 | Ronald Edick | 8 | Son | — | Montreal |
| 19 | Lloyd Jr. Edick | 5 | Son | — | Montreal |
| 20 | Joyce Edick | 5 | Daughter | — | Brooklyn |
| 21 | John Monahan | 52 | Head | Clerk | Ireland |
| 22 | Mary Monahan | 49 | Wife | — | Ireland |
| 23 | Thomas Monahan | 22 | Son | — | Brooklyn |
| 24 | John Monahan THIS PERSON | 16 | Son | — | Brooklyn |
| 25 | Eileen Monahan | 13 | Daughter | — | Brooklyn |
| 26 | Bernard Monahan | 11 | Son | — | Brooklyn |
| 27 | Patricia Monahan | 6 | Daughter | — | Brooklyn |
| 28 | Joseph Gulley | 49 | Head | Stoneyard | Kingston, N.Y. |
| 29 | Margaret Gulley | 18 | Daughter | — | Brooklyn |
| 30 | Louis Scaglione | 60 | Head | Handy Man | Italy |
| 31 | Mary Scaglione | 53 | Wife | — | Brooklyn |
| 32 | Harry Phillip | 55 | Head | Groceries | New York City |
| 33 | Charlotte Phillip | 75 | Wife | — | Brooklyn |
| 34 | Harold Phillip | 21 | Grandson | — | Brooklyn |
| 35 | Helena Rainheimer | 13 | Granddaughter | — | Brooklyn |
| 36 | Edward Graham | 44 | Head | Machinist | Scotland |
| 37 | Mary Graham | 40 | Wife | Maid | Scotland |
| 38 | James Graham | 10 | Son | — | Brooklyn |
| 39 | John Graham | 8 | Son | — | Brooklyn |
| 40 | Andrew Kelly | 42 | Head | Machinist Helper | Scotland |
Related Census Records
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)