JL
John Leonard — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Norfolk-County, Massachusetts
Our Model Tree links this John Leonard across the 1920, 1930 and 1940 US Censuses in Norfolk-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 4-person household.
Age 51
b. ~1889
Male
Head
Born: New Hampshire
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Norfolk-County, Massachusetts |
| Surname | Leonard |
| Given Name | John D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Quincy |
| 1935 Residence (County) | Norfolk |
| Additional Details | |
| Occupation | Night watchman |
| Industry | Insurance Office |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Occupation | Night Watchman |
| Township / Ward | Quincy |
| Est. Birth Year | ~1889 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Leonard | Head | — | 51 | ~1889 |
| Frances Cavanaugh | Other | — | 80 | ~1860 |
| James Leonard | Son | — | 15 | ~1925 |
| Mary Leonard | Spouse | — | 52 | ~1888 |
Census Appearances
1920
Middlesex, Massachusetts
Other, age 31
Middlesex, Massachusetts · implied b. ~1889 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | John J |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Occupation | Care Taker |
| Industry | Boat Club |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1930
Norfolk, Massachusetts
Head, age 41
Norfolk, Massachusetts · implied b. ~1889 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | John J |
| Relationship to Head | head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| Age at First Marriage | 35 |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Occupation | janitor |
| Industry | apartment house |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | $35 |
| Radio Set | R |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Norfolk-County, Massachusetts
Head, age 51
Norfolk-County, Massachusetts · implied b. ~1889 — 4 household members
| Surname | Leonard |
| Given Name | John D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Quincy |
| 1935 Residence (County) | Norfolk |
| Occupation | Night watchman |
| Industry | Insurance Office |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1200 |
| Highest Grade | Hs 4 |
| 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 Leonard across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Leonard
Head · 1940 · age 51 · b. ~1889 · Massachusetts
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Norfolk-County, Massachusetts
Open full size
1940 US Federal Census — Norfolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01631-00702)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary A King | 82 | Mother-in-law | — | Massachusetts |
| 2 | Alice M King | 51 | Head | Machinist | Massachusetts |
| 3 | Charles Walker | 73 | Head | — | England |
| 4 | Barbara Walker | 72 | Wife | — | Massachusetts |
| 5 | Lucy M Shaw | 64 | Grandmother | — | Rhode Island |
| 6 | Carroll E Westall | 51 | Head | Radiator | Massachusetts |
| 7 | Elizabeth G Westall | 54 | Wife | — | Massachusetts |
| 8 | Stephen G Westall | 27 | Son | New Worker | Massachusetts |
| 9 | William A Couillard | 46 | Head | Assistant Accountant | Massachusetts |
| 10 | Mildred M Couillard | 43 | Wife | — | Canada-English |
| 11 | Paul A Couillard | 15 | Son | — | Massachusetts |
| 12 | Jeanne Couillard | 9 | Daughter | — | Massachusetts |
| 13 | Arthur S Putnam | 54 | Head | Piano Tuner | Massachusetts |
| 14 | Annie E Putnam | 50 | Wife | — | Massachusetts |
| 15 | David E Putnam | 19 | Son | — | Massachusetts |
| 16 | Mary M Putnam | 17 | Daughter | — | Massachusetts |
| 17 | Arthur V Edwards | 83 | Father-in-law | Salesman Selling | Massachusetts |
| 18 | Nellie S Edwards | 80 | Mother-in-law | — | Massachusetts |
| 19 | Gaetano Caruso | 68 | Head | Fruit Dealer | Italy |
| 20 | Mary Caruso | 55 | Wife | — | Italy |
| 21 | Louis Caruso | 32 | Son | Fruit Dealer | Italy |
| 22 | Mary Caruso | 19 | Daughter-in-law | Selling | Massachusetts |
| 23 | Lois Caruso | 15 | Daughter | New Worker | Massachusetts |
| 24 | Frank Caruso | 14 | Son | — | Massachusetts |
| 25 | Alice D Young | 55 | Head | Real Estate Operator | France |
| 26 | Edith Young | 25 | Daughter | — | Massachusetts |
| 27 | John D Leonard THIS PERSON | 51 | Head | Night Watchman | New Hampshire |
| 28 | Mary J Leonard | 52 | Wife | — | Massachusetts |
| 29 | James Leonard | 15 | Son | C C Camp | Massachusetts |
| 30 | Frances Cavanaugh | 80 | Aunt | — | Massachusetts |
| 31 | Alice Cavanaugh | None | Head | — | Massachusetts |
| 32 | Ernest L Mason | 45 | Head | Vocational Instructor | Massachusetts |
| 33 | Marguerite Mason | 49 | Wife | — | Massachusetts |
| 34 | Eugene Mason | 23 | Son | Warehouse Clerk | Massachusetts |
| 35 | Helen Mason | 17 | Daughter | Clerical Worker | Massachusetts |
| 36 | Douglas Mason | 16 | Son | — | Massachusetts |
| 37 | Ernest L Jr Mason | 15 | Son | — | Massachusetts |
| 38 | Mary A Decarthy | 63 | Mother-in-law | Housekeeper | South Carolina |
| 39 | Emma S Brooks | 74 | Aunt | — | New York |
| 40 | Norman Stevens | 46 | Head | Telephone Engineer | 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)