MJ
Mary John — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this Mary John across the 1920, 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1899), then head of a 3-person household.
Age 31
b. ~1899
Female
Spouse
Born: Maryland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | John |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 23 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1899 |
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.
3 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Joseph John | Head | — | 28 | ~1902 |
| Mary John | Spouse | — | 31 | ~1899 |
| Mary John | Daughter | — | 1 | ~1929 |
Census Appearances
1920
Baltimore, Maryland
Spouse, age 19
Baltimore, Maryland · implied b. ~1901 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | John |
| Given Name | May |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Spouse, age 31
Baltimore, Maryland · implied b. ~1899 — 3 household members
| Surname | John |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 23 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Spouse, age 41
Baltimore-City-County, Maryland · implied b. ~1899 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | JOHNS |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | machine operator |
| Industry | Tailor shop |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 900 |
| Highest Grade | No 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 Mary John across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary John
Spouse · 1930 · age 31 · b. ~1899 · Maryland
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Baltimore, Maryland
Open full size
1930 US Federal Census — Baltimore, Maryland
Page Contents
50 people indexed on this census page (ia:1930:15thcensus850unit:0105)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Vera | 4 | Grandchild | — | Maryland |
| 52 | Dora | 2 | Grandchild | — | Maryland |
| 53 | John Cass | 34 | Head | Musician | Maryland |
| 54 | Hester Cass | 30 | Wife | Servant | Maryland |
| 55 | Ben Sass | 45 | Head | Shaper | Lithuania |
| 56 | Victoria Sass | 37 | Wife | — | Lithuania |
| 57 | Joseph Sass | 10 | Son | — | Maryland |
| 58 | Effie Russell | 47 | Head | Presser | Pennsylvania |
| 59 | Emmett Russell | 17 | Son | — | Maryland |
| 60 | Samuel Siebel | 39 | Head | Proprietor | Russia |
| 61 | Ellis Siebel | 38 | Wife | — | Russia |
| 62 | Jerome Siebel | 15 | Son | — | Maryland |
| 63 | Dorothy Siebel | 10 | Daughter | — | Maryland |
| 64 | Sidney Siebel | 7 | Son | — | Maryland |
| 65 | Milton M. Eyler | 60 | Head | Shoemaker | Pennsylvania |
| 66 | Walter C. Reed | 61 | Head | Salesman | Maryland |
| 67 | Wm. S. Arnolds | 34 | Head | Painter | Pennsylvania |
| 68 | Anna Green | 57 | Head | Proprietor | Irish Free State |
| 69 | Evan S. Bolton | None | Lodger | Soldier | Virginia |
| 70 | James P. Gerrity | None | — | — | Maryland |
| 71 | Frank Resenta | 23 | Lodger | Machine Operator | Connecticut |
| 72 | Charles Streeby | None | — | — | Maryland |
| 73 | John Collins | None | — | — | Maryland |
| 74 | Marie Collins | None | — | — | Maryland |
| 75 | Joseph Shaw | 35 | Head | Auto Mechanic | Maryland |
| 76 | Geneva Shaw | 33 | Wife | Operator | Maryland |
| 77 | Jesse Stevenson | 44 | Head | Superintendent | Brazil |
| 78 | Irene Stevenson | 35 | Wife | — | Brazil |
| 79 | Mary Stevenson | 18 | Daughter | — | Michigan |
| 80 | Lucy Stevenson | 14 | Daughter | — | Michigan |
| 81 | Harry Stevenson | 10 | Son | — | Michigan |
| 82 | Julia Stevenson | 6 | Daughter | — | Michigan |
| 83 | Walter Stevenson | 4 | Son | — | Michigan |
| 84 | Catherine Stevenson | 1 | Daughter | — | Michigan |
| 85 | Joseph John | 28 | Head | Mechanic | Maryland |
| 86 | Mary John THIS PERSON | 31 | Wife | — | Maryland |
| 87 | Mary M. John | 1 | Daughter | — | Maryland |
| 88 | Addie B. Ryer | 40 | Head | Housekeeper | Maryland |
| 89 | Frank Tanney | 51 | Boarder | Special Officer | Maryland |
| 90 | Louis Kagan | 38 | Head | Salesman | Kentucky |
| 91 | June Kagan | 31 | Wife | — | Maryland |
| 92 | Alex Kovalesky | 28 | Head | Waitress | Maryland |
| 93 | Mary Handwerker | 56 | Head | Housekeeper | Maryland |
| 94 | Isaac Gerhardt | 58 | Head | Bricklayer | Pennsylvania |
| 95 | Ernest Ludwig | 34 | Head | Baker | Germany |
| 96 | Peter Stortz | 52 | Head | Engraver | Switzerland |
| 97 | Beatrice Miles | 34 | Head | Steward | North Carolina |
| 98 | Joseph Leflore | 27 | Head | Watchman | New York |
| 99 | Mary Leflore | 60 | Wife | — | Virginia |
| 100 | Daughter Leflore | 1 | Daughter | — | New York |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)