JL
John Leahy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hartford-County, Connecticut
Our Model Tree links this John Leahy across the 1930 and 1940 US Censuses in Hartford-County, Connecticut (XGBoost, ~Confirmed) — first a head (b.~1865), then head of a 5-person household.
Age 75
b. ~1865
Male
Head
Born: IRISH FREE STATE
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hartford-County, Connecticut |
| Surname | LEAHY |
| Given Name | JOHN B. |
| Relationship to Head | HEAD |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | IRISH FREE STATE |
| 1935 Residence (City) | BRISTOL |
| 1935 Residence (County) | HARTFORD |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birthplace (normalized) | irish free state |
| Township / Ward | Bristol |
| Est. Birth Year | ~1865 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| David Leahy | Son | — | 30 | ~1910 |
| Anna Leahy | Spouse | — | 72 | ~1868 |
| John Leahy | Head | — | 75 | ~1865 |
| James Leahy | Son | — | 27 | ~1913 |
| Agnes Leahy | Daughter | — | 40 | ~1900 |
Census Appearances
1930
Hartford, Connecticut
Head, age 65
Hartford, Connecticut · implied b. ~1865 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | John B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 65 |
| Marital Status | Married |
| Birthplace | Irish Free State |
| Naturalization Status | Naturalized |
| Year of Immigration | 1885 |
| Age at First Marriage | 29 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Molder |
| Industry | Iron Foundry |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 14000 |
| Radio Set | R |
| Birthplace (normalized) | irish free state |
1940
Hartford-County, Connecticut
Head, age 75
Hartford-County, Connecticut · implied b. ~1865 — 5 household members
| Surname | LEAHY |
| Given Name | JOHN B. |
| Relationship to Head | HEAD |
| Sex | M |
| Color / Race | White |
| Age | 75 |
| Marital Status | Married |
| Birthplace | IRISH FREE STATE |
| 1935 Residence (City) | BRISTOL |
| 1935 Residence (County) | HARTFORD |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birthplace (normalized) | irish free state |
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
Head · 1940 · age 75 · b. ~1865 · Connecticut
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Hartford-County, Connecticut
Open full size
1940 US Federal Census — Hartford-County, Connecticut
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00501-00538)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Henry Malmer | 49 | HEAD | Toolmaker | MASSACHUSETTS |
| 42 | Esther Malmer | 49 | WIFE | — | CONNECTICUT |
| 43 | John Mccaughren | 67 | HEAD | — | SCOTLAND |
| 44 | Robert Mccaughren | 24 | SON | Machinist | CONNECTICUT |
| 45 | John F. Mccaughren | 26 | SON | Machinist | CONNECTICUT |
| 46 | Left Vacant By Mistake | None | — | — | — |
| 47 | Anna Semrow | 46 | HEAD | Inspector | POLAND |
| 48 | William Semrow | 23 | SON | Packer | NEW YORK |
| 49 | Walter Semrow | 20 | SON | Electrician | CONNECTICUT |
| 50 | James J. Skelskey | 43 | HEAD | Toolmaker | CONNECTICUT |
| 51 | James J. Jr. Skelskey | 12 | SON | — | CONNECTICUT |
| 52 | Hugh F. Skelskey | 10 | SON | — | CONNECTICUT |
| 53 | William R. Skelskey | 4 | SON | — | NEW YORK |
| 54 | Ernest O. Ihloff | 34 | HEAD | Mechanical Engineer | CONNECTICUT |
| 55 | Mildred S. Ihloff | 32 | WIFE | — | CONNECTICUT |
| 56 | Charles E. Ihloff | 4 | SON | — | CONNECTICUT |
| 57 | Georgia Schnippel | 58 | MOTHER-IN-LAW | Hat Trimmer | CONNECTICUT |
| 58 | Charles H. Gifford | 39 | HEAD | Electrician | CONNECTICUT |
| 59 | Ellen Gifford | 41 | WIFE | — | NEW YORK |
| 60 | Robert Gifford | 18 | SON | — | CONNECTICUT |
| 61 | Ellen Gifford | 8 | DAUGHTER | — | CONNECTICUT |
| 62 | Charles Gifford | 6 | SON | — | CONNECTICUT |
| 63 | John B. Leahy THIS PERSON | 75 | HEAD | — | IRISH FREE STATE |
| 64 | Anna Leahy | 72 | WIFE | — | IRISH FREE STATE |
| 65 | Agnes Leahy | 40 | DAUGHTER | Bookkeeper | CONNECTICUT |
| 66 | David Leahy | 30 | SON | Yard Worker | CONNECTICUT |
| 67 | James Leahy | 27 | SON | Bartender | CONNECTICUT |
| 68 | Joseph Miller | 57 | HEAD | Machinist | PENNSYLVANIA |
| 69 | Dorothy Miller | 32 | DAUGHTER | School Teacher | CONNECTICUT |
| 70 | Marjorie Miller | 30 | DAUGHTER | School Teacher | CONNECTICUT |
| 71 | Clement Miller | 26 | SON | Mover | CONNECTICUT |
| 72 | Lawrence Miller | 18 | SON | — | CONNECTICUT |
| 73 | Elmore M. Day | 36 | HEAD | Screw Mach Operator | CONNECTICUT |
| 74 | Lucy F. Day | 35 | WIFE | — | CONNECTICUT |
| 75 | Elmore Jr. Day | 15 | SON | — | CONNECTICUT |
| 76 | Mildred Day | 13 | DAUGHTER | — | CONNECTICUT |
| 77 | Ruth Day | 11 | DAUGHTER | — | CONNECTICUT |
| 78 | Joan Day | 4 | DAUGHTER | — | CONNECTICUT |
| 79 | Maurice Barkley | 28 | HEAD | Adjuster | IOWA |
| 80 | Helen Barkley | 28 | WIFE | Bench Work | CONNECTICUT |
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)