JL
John Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Strafford-County, New Hampshire
Our Model Tree links this John Leahy across the 1930 and 1940 US Censuses in Strafford-County, New Hampshire (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Male
Son
Born: New Hampshire
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Strafford-County, New Hampshire |
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Somersworth city |
| 1935 Residence (County) | Strafford |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Township / Ward | Somersworth City |
| Est. Birth Year | ~1928 |
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 |
|---|---|---|---|---|
| John Leahy | Son | — | 12 | ~1928 |
| Maureen Leahy | Daughter | — | 7 | ~1933 |
| Robert Leahy | Son | — | 10 | ~1930 |
| John Leahy | Head | — | 39 | ~1901 |
| William Leahy | Son | — | 5 | ~1935 |
| Marion Leahy | Spouse | — | 40 | ~1900 |
| Sheila Leahy | Daughter | — | 2 | ~1938 |
Census Appearances
1930
Strafford, New …
Son, age 2
Strafford, New Hampshire · implied b. ~1928 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Strafford-County, New …
Son, age 12
Strafford-County, New Hampshire · implied b. ~1928 — 7 household members
| Surname | Leahy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Somersworth city |
| 1935 Residence (County) | Strafford |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
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 Leahy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Leahy
Son · 1940 · age 12 · b. ~1928 · New Hampshire
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Sibling
Maureen Leahy
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Leahy
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sheila Leahy
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Leahy
Sibling · 1940 · age 10
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 — Strafford-County, New Hampshire
Open full size
1940 US Federal Census — Strafford-County, New Hampshire
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02298-00614)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Exilia Poulin | 56 | Wife | — | Canada |
| 2 | John Leahy | 39 | Head | Salesman | New Hampshire |
| 3 | Marion Leahy | 40 | Wife | — | New Hampshire |
| 4 | John Leahy THIS PERSON | 12 | Son | — | New Hampshire |
| 5 | Robert Leahy | 10 | Son | — | New Hampshire |
| 6 | Maureen Leahy | 7 | Daughter | — | New Hampshire |
| 7 | William Leahy | 5 | Son | — | New Hampshire |
| 8 | Sheila Leahy | 2 | Daughter | — | New Hampshire |
| 9 | Adelaide Caron | 59 | Head | Labourer | Canada |
| 10 | Maurice Caron | 23 | Daughter | Packer | New Hampshire |
| 11 | Edna Foss | 73 | Lodger | Housekeeper | New Hampshire |
| 12 | Rita Foss | 19 | Lodger | Trimmer | New Hampshire |
| 13 | Ernest Thibeau | 35 | Head | Mechanic | Maine |
| 14 | Yvonne Thibeau | 34 | Wife | — | Canada |
| 15 | Martin Thibeau | 1 | Son | — | New Hampshire |
| 16 | Donald Thibeau | 12 | Son | — | New Hampshire |
| 17 | Marie Anne Dumont | 29 | Mother in law | Spinner | Canada |
| 18 | Philomene Dumont | 74 | Mother in law | — | Canada |
| 19 | Lucien Vincent | 23 | Head | Heeler | New Hampshire |
| 20 | William Vincent | 19 | Brother | Heeler | New Hampshire |
| 21 | Anita Vincent | 16 | Sister | Housekeeper | New Hampshire |
| 22 | Roland Vincent | 14 | Brother | — | New Hampshire |
| 23 | Paul Vincent | 11 | Brother | — | New Hampshire |
| 24 | Asana Lafance | 50 | Housekeeper | Housekeeper | Maine |
| 25 | George Dornas | 55 | Head | Machinist | Canada |
| 26 | Mary Dornas | 52 | Wife | — | Canada |
| 27 | Eva Dornas | 22 | Daughter | Cementer | New Hampshire |
| 28 | Alfred Dornas | 26 | Son | Doffer | New Hampshire |
| 29 | Anna Jacques | 46 | Head | — | Canada |
| 30 | Anita Jacques | 18 | Daughter | Cementer | New Hampshire |
| 31 | Lionel Jacques | 17 | Son | Tacker | New Hampshire |
| 32 | Alphonse Cote | 68 | Head | Weaver | Canada |
| 33 | Emma Cote | 44 | Wife | Carder | New Hampshire |
| 34 | Anita Cote | 20 | Daughter | Stitcher | New Hampshire |
| 35 | Roland Cote | 17 | Son | Cementer | New Hampshire |
| 36 | Andre Cote | 4 | Son | — | New Hampshire |
| 37 | Baptiste Fortier | 48 | Head | Loader | Canada |
| 38 | Alphonsine Fortier | 50 | Wife | — | Canada |
| 39 | Raymond Fortier | 24 | Son | Flyer | New Hampshire |
| 40 | George Fortier | 23 | Son | Tacker | New Hampshire |
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)