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 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1927), then head of a 11-person household.
Age 3
b. ~1927
Female
Daughter
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | John |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore |
| Est. Birth Year | ~1927 |
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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary John | Daughter | — | 3 | ~1927 |
| John John | Head | — | 37 | ~1893 |
| George John | Son | — | 9 | ~1921 |
| Dolores John | Daughter | — | 7 | ~1923 |
| Mary John | Spouse | — | 33 | ~1897 |
| Helen John | Daughter | — | 11 | ~1919 |
| Anna Mcdermott | Other | — | 50 | ~1880 |
| Margaret John | Daughter | — | 5 | ~1925 |
| Catherine John | Daughter | — | 13 | ~1917 |
| Anna John | Daughter | — | 1 | ~1929 |
| John Mcdermott | Other | — | 59 | ~1871 |
Census Appearances
1930
Baltimore, Maryland
Daughter, age 3
Baltimore, Maryland · implied b. ~1927 — 11 household members
| Surname | John |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 14
Baltimore-City-County, Maryland · implied b. ~1926 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | John |
| Given Name | Margaret A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | 8 |
| 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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary John
Daughter · 1930 · age 3 · b. ~1927 · Maryland
★ You are viewing this record
Sibling
Helen John
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dolores John
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George John
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret John
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna John
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine John
Sibling · 1930 · age 13
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
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:1930:15thcensus854unit:0769)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Wolf | 60 | Head | — | Maryland |
| 2 | Emma Wolf | 57 | Wife | — | Maryland |
| 3 | Isabelle Hamilton | 38 | Boarder | Filler | Maryland |
| 4 | John G. John | 37 | Head | Laborer | Maryland |
| 5 | Mary E. John | 33 | Wife | — | Maryland |
| 6 | Catherine M. John | 13 | Daughter | — | Maryland |
| 7 | Helen G. John | 11 | Daughter | — | Maryland |
| 8 | George J. John | 9 | Son | — | Maryland |
| 9 | Dolores V. John | 7 | Daughter | — | Maryland |
| 10 | Margaret John | 5 | Daughter | — | Maryland |
| 11 | Mary E. John THIS PERSON | 3 | Daughter | — | Maryland |
| 12 | Anna R. John | 1 | Daughter | — | Maryland |
| 13 | Anna Mcdermott | 50 | Boarder | — | Maryland |
| 14 | John Mcdermott | 59 | Uncle | Beamsman | Maryland |
| 15 | Head Ledvina | 44 | Head | Seamstress | Maryland |
| 16 | Gilbert G. Ledvina | 23 | Son | Finisher | Maryland |
| 17 | William H. Ledvina | 21 | Son | Helper | Maryland |
| 18 | Mabel Ledvina | 19 | Daughter | Saleslady | Maryland |
| 19 | Margaret H. Ledvina | 16 | Daughter | — | Maryland |
| 20 | Francis J. Ledvina | 13 | Son | — | Maryland |
| 21 | Stephen L. Colwood | 65 | Head | Retired | Maryland |
| 22 | Elizabeth S. Colwood | 62 | Wife | — | Ireland |
| 23 | John C. Colwood | 30 | Son | Fireman | Maryland |
| 24 | Richard J. Colwood | 25 | Son | Asst. Manager | Maryland |
| 25 | Elizabeth A. Colwood | 23 | Daughter | — | Maryland |
| 26 | Catherine M. Colwood | 20 | Daughter | Stenographer | Maryland |
| 27 | Robert H. Krichton | 49 | Head | Invalid | Maryland |
| 28 | George H. Krichton | 20 | Son | Shipman | Maryland |
| 29 | Hugh Krichton | 15 | Son | Laborer | Maryland |
| 30 | Enos Simms | 45 | Sister | Housekeeper | Maryland |
| 31 | George R. Truelove | 73 | Head | Pensioner | Virginia |
| 32 | Truelove | 73 | Wife | — | New York |
| 33 | James C. Truelove | 45 | Daughter | — | Virginia |
| 34 | Charles Truelove | 40 | Son | Foreman | Maryland |
| 35 | Joseph Ragno | 35 | Head | Laborer | Italy |
| 36 | Josephine A. Ragno | 29 | Wife | — | Africa |
| 37 | Angeline M. Ragno | 11 | Daughter | — | Maryland |
| 38 | Joseph Ragno | 7 | Son | — | Maryland |
| 39 | Vincenza Ragno | 4 | Daughter | — | Maryland |
| 40 | Frank Sorrentino | 24 | Head | Stonemason | Africa |
| 41 | Emma M. Sorrentino | 19 | Wife | — | Maryland |
| 42 | Mauro Sorrentino | 1 | Son | — | Maryland |
| 43 | Ella Healy | None | Head | — | — |
| 44 | Henry R. Bayer | 35 | Head | Salesman | Texas |
| 45 | Olivia D. Bayer | 36 | Wife | Filler | Virginia |
| 46 | Alfred H. Bayer | 15 | Son | — | Virginia |
| 47 | Dorothy P. Bayer | 13 | Daughter | — | Virginia |
| 48 | Charles A. Rolfing | 39 | Head | Machinist | Maryland |
| 49 | Lilly Rolfing | 39 | Wife | — | Maryland |
| 50 | Charles W. Rolfing | 15 | Son | — | Maryland |
Related Census Records
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)