JL
John Leonard — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John Leonard across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1884), then head of a 6-person household.
Age 56
b. ~1884
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Leonard |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore city |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Laborer |
| Industry | Dept Education |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Laborer |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1884 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Katherine Leonard | Daughter | — | 27 | ~1913 |
| John Leonard | Head | — | 56 | ~1884 |
| Marguerite Leonard | Other | — | 45 | ~1895 |
| Albert Bolek | Other | — | 55 | ~1885 |
| Gertrude Leonard | Other | — | 54 | ~1886 |
| Katherine Leonard | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Baltimore, Maryland
Other, age 42
Baltimore, Maryland · implied b. ~1878 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | John G |
| Relationship to Head | Brother-in-law |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Foreman |
| Industry | Washington |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Head, age 50
Baltimore, Maryland · implied b. ~1880 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leonard |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 20 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Porter |
| Industry | Drug store |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 28 |
| Veteran | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Head, age 56
Baltimore-City-County, Maryland · implied b. ~1884 — 6 household members
| Surname | Leonard |
| Given Name | John J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore city |
| 1935 Residence (County) | Baltimore City |
| Occupation | Laborer |
| Industry | Dept Education |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 988 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Leonard
Head · 1940 · age 56 · b. ~1884 · Maryland
★ 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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01517-00151)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Minnie B Smalling | 65 | Head | — | N. Carolina |
| 2 | Hannah W Smalling | 30 | Daughter | Saleslady | Virginia |
| 3 | John J Leonard THIS PERSON | 56 | Head | Laborer | Maryland |
| 4 | Katherine A Leonard | 55 | Wife | — | Maryland |
| 5 | Katherine E Leonard | 27 | Daughter | — | Maryland |
| 6 | Gertrude A Leonard | 54 | Sister | — | Maryland |
| 7 | Marguerite Leonard | 45 | Sister | Distributor | Maryland |
| 8 | Albert C Bolek | 55 | Lodger | Houseman | Maryland |
| 9 | Michael J Stewart | 46 | Head | Patrolman | Maryland |
| 10 | Nellie M Stewart | 40 | Wife | Stenographer | Maryland |
| 11 | James F George | 62 | Head | Packer - Food | Virginia |
| 12 | Ida J George | 52 | Wife | — | Maryland |
| 13 | Norman George | 24 | Son | Sawyer | Maryland |
| 14 | Llewellyn George | 20 | Son | Sawyer | Maryland |
| 15 | Earle George | 16 | Son | — | Maryland |
| 16 | Virginia George | 10 | Daughter | — | Maryland |
| 17 | Laura B George | 12 | Daughter | — | Maryland |
| 18 | Edward George | 9 | Son | — | Maryland |
| 19 | Mary George | 6 | Daughter | — | Maryland |
| 20 | James F Jr George | 28 | Head | Solicitor | Maryland |
| 21 | Anna George | 24 | Wife | — | Maryland |
| 22 | Louis H Porter | 47 | Head | Decorator | Maryland |
| 23 | Margaret E Porter | 45 | Wife | — | Maryland |
| 24 | Louis R Porter | 20 | Son | Laborer | Maryland |
| 25 | Melvin J Porter | 13 | Son | — | Maryland |
| 26 | George E Forster | 40 | Head | Laboratory Assistant | Maryland |
| 27 | Catherine Forster | 40 | Wife | Inspection | Maryland |
| 28 | Lillian Braxton | 36 | Head | Household | Maryland |
| 29 | Catherine Braxton | 17 | Daughter | — | Maryland |
| 30 | Harry Braxton | 4 | Son | — | Maryland |
| 31 | William Burnell | 21 | Head | Janitor | Maryland |
| 32 | Dorothy Burnell | 21 | Wife | — | Maryland |
| 33 | Dolores Burnell | 2 | Daughter | — | Maryland |
| 34 | Gertrude Burnell | 0 | Daughter | — | Maryland |
| 35 | Margie Mason | 42 | Head | Household | Virginia |
| 36 | Nimrod J Hustrett | 10 | Son | — | Maryland |
| 37 | Matten Boston | 36 | Head | Helper | N. Carolina |
| 38 | Alma Boston | 30 | Wife | — | S. Carolina |
| 39 | Elijah Boston | 52 | Father-in-law | Laborer | N. Carolina |
| 40 | Bernard J Cronin | 45 | Head | Laborer | Maryland |
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)