JJ
John John — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this John John across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 9-person household.
Age 11
b. ~1929
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | John |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | 5 |
| 1935 Residence | Same house |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1929 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Cecilia John | Daughter | — | 21 | ~1919 |
| Hilda John | Daughter | — | 18 | ~1922 |
| Theresa John | Daughter | — | 7 | ~1933 |
| John John | Head | — | 47 | ~1893 |
| John John | Son | — | 11 | ~1929 |
| Eugene John | Son | — | 14 | ~1926 |
| Stanley John | Son | — | 20 | ~1920 |
| Edward John | Son | — | 16 | ~1924 |
| Lannie John | Spouse | — | 48 | ~1892 |
Census Appearances
1930
Baltimore, Maryland
Son, age 1
Baltimore, Maryland · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | John |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Son, age 11
Baltimore-City-County, Maryland · implied b. ~1929 — 9 household members
| Surname | John |
| Given Name | John Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | 5 |
| 1935 Residence | Same house |
| 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 John across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John John
Son · 1940 · age 11 · b. ~1929 · Maryland
★ You are viewing this record
Sibling
Theresa John
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hilda John
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward John
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cecilia John
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley John
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eugene John
Sibling · 1940 · age 14
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 — 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-t0627-01509-00246)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Frances Schminski | 4 | daughter | — | Maryland |
| 42 | Robert Schminski | 1 | son | — | Maryland |
| 43 | John John | 47 | head | Blacksmith | Poland |
| 44 | Lannie | Fannie John | 48 | wife | — | Poland |
| 45 | Cecilia John | 21 | daughter | Grader | Maryland |
| 46 | Stanley John | 20 | son | Laborer | Maryland |
| 47 | Hilda John | 18 | daughter | Milliner | Maryland |
| 48 | Edward John | 16 | son | Pin Boy | Maryland |
| 49 | Eugene John | 14 | son | — | Maryland |
| 50 | John Jr. John THIS PERSON | 11 | son | — | Maryland |
| 51 | Theresa John | 7 | daughter | — | Maryland |
| 52 | August Zacharski | 52 | head | Fireman | Maryland |
| 53 | Elizabeth Zacharski | 50 | wife | — | Maryland |
| 54 | Louise Zacharski | 20 | daughter | Examiner | Maryland |
| 55 | August Jr. Zacharski | 17 | son | Packer | Maryland |
| 56 | Amos Steinmetz | 76 | head | Mechanic | Poland |
| 57 | Stella Steinmetz | 50 | wife | — | Poland |
| 58 | Joseph Goralski | 48 | head | Salesman | Maryland |
| 59 | Anna Goralski | 44 | wife | — | Maryland |
| 60 | Leon Goralski | 24 | son | Laborer | Maryland |
| 61 | Edward Goralski | 17 | son | — | Maryland |
| 62 | Adam Kozlowski | 29 | head | Laborer | Maryland |
| 63 | Alice Kozlowski | 28 | wife | — | Maryland |
| 64 | Raymond Kozlowski | 3 | son | — | Maryland |
| 65 | Robert Szymalewski | 39 | head | Packer | Maryland |
| 66 | Walter Szymalewski | 13 | son | — | Maryland |
| 67 | Aloysius Schum | 34 | head | Laborer | Maryland |
| 68 | Clara Schum | 31 | wife | Packer | Maryland |
| 69 | Marie Schum | 10 | daughter | — | Maryland |
| 70 | Clara Schum | 8 | daughter | — | Maryland |
| 71 | James J. Ament | 49 | head | Fireman | Maryland |
| 72 | Catherine Ament | 47 | wife | — | Maryland |
| 73 | James Jr. Ament | 21 | son | Attendant | Maryland |
| 74 | Andrew Ament | 19 | son | Laborer | Maryland |
| 75 | George Ament | 15 | son | — | Maryland |
| 76 | Gertrude Brown | 25 | daughter | Cashier | Maryland |
| 77 | Barbara Brown | 3 | daughter | — | Maryland |
| 78 | John Pruitt | 32 | head | Chauffeur | Maryland |
| 79 | Josephine Pruitt | 31 | wife | — | Maryland |
| 80 | John Jr. Pruitt | 9 | son | — | 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)