WJ
William John — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this William John across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents John & Lewis — first a head (b.~1910), then head of a 4-person household.
Age 30
b. ~1910
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | John |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Occupation | Fireman |
| Industry | City Fire Department |
| Class of Worker | GW |
| Hours Worked | 84 |
| Income (1939) | 1800 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Fireman |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1910 |
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 William | Age | Birth yr |
|---|---|---|---|---|
| Betty John | Daughter | — | ~1940 | |
| William John | Head | — | 30 | ~1910 |
| Jean John | Daughter | — | 7 | ~1933 |
| Ruth John | Spouse | — | 31 | ~1909 |
Census Appearances
1920
Baltimore, Maryland
Son, age 6
Baltimore, Maryland · implied b. ~1914 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | John |
| Given Name | William S. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 18
Baltimore, Maryland · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | John |
| Given Name | William S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Head, age 30
Baltimore-City-County, Maryland · implied b. ~1910 — 4 household members
| Surname | John |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | Fireman |
| Industry | City Fire Department |
| Class of Worker | GW |
| Hours Worked | 84 |
| Income (1939) | 1800 |
| Highest Grade | Hs 4 |
| 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 William John across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John John (~0.92 confidence) and father Lewis John (~0.92 confidence) and mother Birdie John (~0.92 confidence) and mother Rosa John (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John John
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Lewis John
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Birdie John
b. ~1892
Source mother
● Household
· direct · ~0.92
Mother
Rosa John
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William John
Head · 1940 · age 30 · b. ~1910 · 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
39 people indexed on this census page (nara:1940:m-t0627-01532-00310)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Ernestine B Bowen | 48 | Wife | — | Maryland |
| 42 | Robert W Shew | 44 | Head | Salesman | Pennsylvania |
| 43 | Flora E Shew | 47 | Wife | — | Pennsylvania |
| 44 | Aletha E Shew | 14 | Daughter | — | Pennsylvania |
| 45 | Henry Ehatt | 30 | Head | Machinist | Maryland |
| 46 | Helen E Ehatt | 29 | Wife | — | Maryland |
| 47 | Henry Ehatt | 12 | Son | — | Maryland |
| 48 | Lois Ehatt | 8 | Daughter | — | Maryland |
| 49 | John Ehatt | 26 | Brother | Machinist | Maryland |
| 51 | Lawrence J Schoenlein | 48 | Head | Superintendent | Maryland |
| 52 | Dorothy M Schoenlein | 25 | Daughter | Stenographer | Maryland |
| 53 | Jane E Schoenlein | 21 | Daughter | — | Maryland |
| 54 | Ruth E Schoenlein | 14 | Daughter | — | Maryland |
| 55 | Karl R Kendall | 51 | Head | Fireman | Maryland |
| 56 | Rosalie W Kendall | 57 | Wife | — | Louisiana |
| 57 | William F Donohue | 58 | Head | Stenographer | Maryland |
| 58 | Mable G Donohue | 51 | Wife | — | India |
| 59 | William L Trumpler | 27 | Head | Baker Helper | Maryland |
| 60 | Angela N Trumpler | 23 | Wife | — | Maryland |
| 61 | William Trumpler | 7 | Son | — | Maryland |
| 62 | Ernest D Skoppeck | 33 | Head | Shoemaker | Germany |
| 63 | Molly Skoppeck | 25 | Wife | — | Maryland |
| 64 | Elmer J Warfield | 44 | Head | Electrician | Maryland |
| 65 | Lottie V Warfield | 50 | Wife | — | Pennsylvania |
| 66 | Verna C Warfield | 20 | Daughter | Packer | Maryland |
| 67 | John W Wagner | 44 | Head | Shop Foreman | England |
| 68 | Anna R Wagner | 51 | Wife | — | Pennsylvania |
| 69 | Delores M Wagner | 8 | Daughter | — | Maryland |
| 70 | Stanley W Pugh | 33 | Head | Electric Welder | West Virginia |
| 71 | Edith M Pugh | 36 | Wife | — | North Carolina |
| 72 | Doris J Pugh | 4 | Daughter | — | Maryland |
| 73 | Ella A Pugh | 1 | Daughter | — | Maryland |
| 74 | William John THIS PERSON | 30 | Head | Fireman | Maryland |
| 75 | Ruth G John | 31 | Wife | — | Maryland |
| 76 | Jean E John | 7 | Daughter | — | Maryland |
| 77 | Betty A John | 0 | Daughter | — | Maryland |
| 78 | John L Lignot | 31 | Head | Underwriter | Maryland |
| 79 | Elsie N Lignot | 33 | Wife | — | Maryland |
| 80 | Carole J Lignot | 6 | Daughter | — | Maryland |
Pedigree Summary
William
Gen 1 · 4 parents
~0.92
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)