WM
William Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Queens-County, New York
Our Model Tree links this William Mcmahon across the 1930 and 1940 US Censuses in Queens-County, New York (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 8-person household.
Age 25
b. ~1915
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Queens-County, New York |
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Queens |
| Additional Details | |
| Occupation | Butcher |
| Industry | Meat Market |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 452 |
| Highest Grade | No 8 |
| 1935 Residence | Same Place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Butcher |
| Township / Ward | New York City |
| Est. Birth Year | ~1915 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Mcmahon | Son | — | 7 | ~1933 |
| Florence Mcmahon | Daughter | — | 18 | ~1922 |
| Edward Mcmahon | Son | — | 37 | ~1903 |
| Robert Mcmahon | Son | — | 12 | ~1928 |
| William Mcmahon | Son | — | 25 | ~1915 |
| Annie Mcmahon | Spouse | — | 62 | ~1878 |
| James Mcmahon | Head | — | 61 | ~1879 |
| James Mcmahon | Son | — | 30 | ~1910 |
Census Appearances
1930
Queens, New …
Other, age 13
Queens, New York · implied b. ~1917 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Inmate |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New York |
| Occupation | Yes |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Queens-County, New …
Son, age 25
Queens-County, New York · implied b. ~1915 — 8 household members
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Queens |
| Occupation | Butcher |
| Industry | Meat Market |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 452 |
| Highest Grade | No 8 |
| 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 William Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcmahon
Son · 1940 · age 25 · b. ~1915 · New York
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Sibling
Edward Mcmahon
Sibling · 1940 · age 37
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcmahon
Sibling · 1940 · age 30
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mcmahon
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Mcmahon
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcmahon
Sibling · 1940 · age 12
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 — Queens-County, New York
Open full size
1940 US Federal Census — Queens-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02747-00138)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Francis Catt | 5 | Head | — | New York |
| 42 | Charlotte Wick | 40 | Sister-in-law | Clerk | New York |
| 43 | Isabella Bogardus | 61 | Mother-in-law | — | New York |
| 44 | Robert G. Bogardus | 29 | Son-in-law | Clerk | New York |
| 45 | Donald Bogardus | 26 | Son-in-law | Mechanic | New York |
| 46 | Jessie E. Bogardus | 32 | Daughter | Switchboard Oper. | New York |
| 47 | James Mcmahon | 61 | Head | Pressman | New York |
| 48 | Annie Mcmahon | 62 | Wife | — | New York |
| 49 | Edward Mcmahon | 37 | Son | Pressman | New York |
| 50 | James Mcmahon | 30 | Son | Clerk | New York |
| 51 | William Mcmahon THIS PERSON | 25 | Son | Butcher | New York |
| 52 | Florence Mcmahon | 18 | Daughter | — | New York |
| 53 | Robert Mcmahon | 12 | Son | — | New York |
| 54 | William Jr. Mcmahon | 7 | Son | — | New York |
| 55 | John Kaefer | 56 | Head | Auto Mechanic | New York |
| 56 | Elizabeth Kaefer | 49 | Wife | Telephone Operator | New York |
| 57 | Ernest Kaefer | 21 | Son | Auto Mechanic | New York |
| 58 | Gertrude Kaefer | 24 | Daughter-in-law | — | New Jersey |
| 59 | Elizabeth Waller | 76 | Mother-in-law | — | New York |
| 60 | John Pagliuca | 42 | Head | Bookkeeper | New York |
| 61 | Rose Pagliuca | 43 | Wife | — | Italy |
| 62 | Anthony Pagliuca | 22 | Son | Laborer | New York |
| 63 | Julia Pagliuca | 21 | Daughter | — | New Jersey |
| 64 | Florence Pagliuca | 20 | Daughter | Piece Worker | New Jersey |
| 65 | Philomena Pagliuca | 18 | Daughter | — | New Jersey |
| 66 | Lucille Pagliuca | 15 | Daughter | — | New York |
| 67 | Virginia Pagliuca | 12 | Daughter | — | New York |
| 68 | Robert Ohlen | 42 | Head | Coffee Roaster | New York |
| 69 | Florence Ohlen | 37 | Wife | — | New York |
| 70 | George Noell | 40 | Head | Investigator | New York |
| 71 | Anne Noell | 33 | Wife | — | New York |
| 72 | Joseph Rehkamp | 69 | Head | Cashier | New York |
| 73 | Katherine Rehkamp | 63 | Wife | — | New York |
| 74 | Joseph Jr. Rehkamp | 39 | Son | Guard | New York |
| 75 | Mary Rehkamp | 27 | Daughter | — | New York |
| 76 | Josephine Rehkamp | 16 | Granddaughter | — | New York |
| 77 | Barbara Rehkamp | 15 | Granddaughter | — | New York |
| 78 | Richard Rehkamp | 12 | Grandson | — | New York |
| 79 | Harold Rehkamp | 11 | Grandson | — | New York |
| 80 | Edward Boyle | 40 | Head | Watchman | 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)