WM
William Mahoney — 1940 US Census Record
Model Tree available1940 United States Federal Census · Essex-County, Massachusetts
Our Model Tree links this William Mahoney across the 1920, 1930 and 1940 US Censuses in Essex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Stephen & Mary — first a son (b.~1917), then head of a 5-person household.
Age 23
b. ~1917
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Essex-County, Massachusetts |
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence city |
| 1935 Residence (County) | Essex |
| Additional Details | |
| Occupation | laborer |
| Industry | W.P.A. |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Laborer |
| Township / Ward | Lawrence City |
| Est. Birth Year | ~1917 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| William Mahoney | Son | — | 23 | ~1917 |
| Mary Mahoney | Head | — | 48 | ~1892 |
| Stephen Mahoney | Son | — | 18 | ~1922 |
| Claire Mahoney | Daughter | — | 9 | ~1931 |
| Kathleen Mahoney | Daughter | — | 14 | ~1926 |
Census Appearances
1920
Essex, Massachusetts
Son, age 2
Essex, Massachusetts · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William F. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Essex, Massachusetts
Son, age 13
Essex, Massachusetts · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Essex-County, Massachusetts
Son, age 23
Essex-County, Massachusetts · implied b. ~1917 — 5 household members
| Surname | Mahoney |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lawrence city |
| 1935 Residence (County) | Essex |
| Occupation | laborer |
| Industry | W.P.A. |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Stephen Mahoney (~0.82 confidence) and mother Mary Mahoney (~0.82 confidence) and mother Mary Mahoney (~0.82 confidence) and mother Mary Mahoney (~0.92 confidence) and mother Mary Mahoney (~0.92 confidence) and father Stephen Mahoney (~0.92 confidence) and father George Mahoney (~0.92 confidence) and mother Helen Mahoney (~0.92 confidence). The pedigree spans 2 generations with 8 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.88
Father
Stephen Mahoney
b. ~1865
Source father>father
● Household
· direct · ~0.82
Mother
Mary Mahoney
b. ~1866
Source father>mother
● Household
· direct · ~0.82
Mother
Mary Mahoney
b. ~1867
Source father>mother
● Household
· direct · ~0.82
Mother
Mary Mahoney
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Mary Mahoney
b. ~1892
Source mother
● Household
· direct · ~0.92
Father
Stephen Mahoney
b. ~1892
Source father
● Household
· direct · ~0.92
Father
George Mahoney
b. ~1896
Source father
● Household
· direct · ~0.92
Mother
Helen Mahoney
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mahoney
Son · 1940 · age 23 · b. ~1917 · Massachusetts
★ You are viewing this record
Sibling
Claire Mahoney
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kathleen Mahoney
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stephen Mahoney
Sibling · 1940 · age 18
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 — Essex-County, Massachusetts
Open full size
1940 US Federal Census — Essex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01583-00765)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Catherine Stapleton | 42 | Head | — | Ireland |
| 2 | Catherine Stapleton | 21 | Daughter | Waitress | Massachusetts |
| 3 | Edward Stapleton | 19 | Son | Laborer | Massachusetts |
| 4 | William Stapleton | 18 | Son | Chef | Massachusetts |
| 5 | Cornelius Stapleton | 16 | Son | — | Massachusetts |
| 6 | Joseph Stapleton | 15 | Son | — | Massachusetts |
| 7 | Rita Stapleton | 14 | Daughter | — | Massachusetts |
| 8 | Eileen Stapleton | 13 | Daughter | — | Massachusetts |
| 9 | Theresa Stapleton | 12 | Daughter | — | Massachusetts |
| 10 | Dorothy Stapleton | 9 | Daughter | — | Massachusetts |
| 11 | Salvatore Cors | 41 | Head | Barber | Italy |
| 12 | Lucy Cors | 37 | Wife | — | Italy |
| 13 | Mary Cors | 19 | Daughter | Mender | Massachusetts |
| 14 | Minnie Cors | 15 | Daughter | — | Massachusetts |
| 15 | Michael Cors | 13 | Son | — | Massachusetts |
| 16 | Anna Cors | 9 | Daughter | — | Massachusetts |
| 17 | Salvatore Cors | 6 | Son | — | Massachusetts |
| 18 | Charles Cors | 3 | Son | — | Massachusetts |
| 19 | Lena Peters | 38 | Head | Twister | Canada |
| 20 | Joseph Peters | 18 | Son | Ice Man | Massachusetts |
| 21 | Esther Peters | 15 | Daughter | — | Massachusetts |
| 22 | Joseph Gallant | 71 | Father | Laborer | Canada |
| 23 | Victor Harrup | 38 | Lodger | Laborer | Massachusetts |
| 24 | Mary Mahoney | 48 | Head | — | Massachusetts |
| 25 | William Mahoney THIS PERSON | 23 | Son | Laborer | Massachusetts |
| 26 | Stephen Mahoney | 18 | Son | Laborer | Massachusetts |
| 27 | Kathleen Mahoney | 14 | Daughter | — | Massachusetts |
| 28 | Claire Mahoney | 9 | Daughter | — | Massachusetts |
| 30 | George Thomson | 51 | Head | Engineer | Scotland |
| 31 | Bridget Thomson | 54 | Wife | — | Ireland |
| 32 | Mary Thomson | 27 | Daughter | Winder | Massachusetts |
| 33 | James Thomson | 26 | Son | Trucker | Massachusetts |
| 34 | Rachel Thomson | 21 | Daughter | Servant | Massachusetts |
| 35 | George Thomson | 20 | Son | Laborer | Massachusetts |
| 36 | Thomas Thomson | 18 | Son | Woodsman | Massachusetts |
| 37 | Marjorie Thomson | 15 | Daughter | — | Massachusetts |
| 38 | Fanny Abbott | 73 | Head | — | Maine |
| 39 | Rosemarie Hall | 25 | Granddaughter | Yarn Examiner | Massachusetts |
| 40 | Donald Coleman | 45 | Lodger | Elevator Man | Massachusetts |
Pedigree Summary
William + 3 siblings
Gen 1 · 5 parents
~0.92
Gen 2 · 3 grandparents
~0.82
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)