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John Kerr — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this John Kerr across the 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a son (b.~1912), then head of a 11-person household.
Age 18
b. ~1912
Male
Son
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Kerr |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| 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 | ~1912 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Raymond Kerr | Son | — | 8 | ~1922 |
| Catherine Kerr | Daughter | — | 21 | ~1909 |
| John Kerr | Son | — | 18 | ~1912 |
| Dorothy Kerr | Daughter | — | 2 | ~1928 |
| Robert Kerr | Son | — | 6 | ~1924 |
| William Kerr | Head | — | 48 | ~1882 |
| Charles Kerr | Son | — | 10 | ~1920 |
| William Kerr | Son | — | 23 | ~1907 |
| Catherine Kerr | Spouse | — | 45 | ~1885 |
| Margaret Kerr | Daughter | — | 16 | ~1914 |
| George Kerr | Son | — | 11 | ~1919 |
Census Appearances
1930
Baltimore, Maryland
Son, age 18
Baltimore, Maryland · implied b. ~1912 — 11 household members
| Surname | Kerr |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| 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
Head, age 29
Baltimore-City-County, Maryland · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Karr |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Occupation | Proprietor |
| Industry | Pool Room |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 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 Kerr across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kerr
Son · 1930 · age 18 · b. ~1912 · Maryland
★ You are viewing this record
Sibling
Charles Kerr
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Kerr
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Kerr
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Kerr
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Kerr
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Kerr
Sibling · 1930 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dorothy Kerr
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Kerr
Sibling · 1930 · age 6
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:1930:15thcensus861unit:0602)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William Kerr | 48 | Head | Sheet Metal Worker | Maryland |
| 2 | Catherine Kerr | 45 | Wife | — | Maryland |
| 3 | William Kerr | 23 | Son | — | Maryland |
| 4 | Catherine Kerr | 21 | Daughter | — | Maryland |
| 5 | John Kerr THIS PERSON | 18 | Son | — | Maryland |
| 6 | Margaret Kerr | 16 | Daughter | — | Maryland |
| 7 | George Kerr | 11 | Son | — | Maryland |
| 8 | Charles Kerr | 10 | Son | — | Maryland |
| 9 | Raymond Kerr | 8 | Son | — | Maryland |
| 10 | Robert Kerr | 6 | Son | — | Maryland |
| 11 | Dorothy Kerr | 2 | Daughter | — | Maryland |
| 12 | William Speer | 50 | Head | Foreman | Maryland |
| 13 | Lillian Speer | 49 | Wife | — | Maryland |
| 14 | William Speer | 10 | Son | — | Maryland |
| 15 | Lillian Speer | 6 | Daughter | — | Maryland |
| 16 | Elizabeth Speer | 4 | Daughter | — | Maryland |
| 17 | Lillian Speer | 2 | Daughter | — | Maryland |
| 18 | Lillian Speer | 90 | Mother | — | Maryland |
| 19 | William Johnston | 55 | Head | Top Maker | Maryland |
| 20 | Emma Johnston | 51 | Wife | — | New Jersey |
| 21 | Walter Johnston | 28 | Son | — | Maryland |
| 22 | Emma Johnston | 25 | Daughter | — | Maryland |
| 23 | Charles Johnston | 23 | Son | — | Maryland |
| 24 | George Johnston | 20 | Son | — | Pennsylvania |
| 25 | William Lutz | 26 | Head | Engineer | Maryland |
| 26 | Elizabeth Lutz | 26 | Wife | — | Maryland |
| 27 | William Lutz | 5 | Son | — | Maryland |
| 28 | George Lutz | 3 | Son | — | Maryland |
| 29 | James Lutz | 1 | Son | — | Maryland |
| 30 | William Smith | 34 | Head | Chauffeur | Maryland |
| 31 | Lillian Smith | 35 | Wife | — | Maryland |
| 32 | William Smith | 12 | Son | — | Maryland |
| 33 | Frank Galla | 72 | Head | — | Scotland |
| 34 | Mary Galla | 75 | Wife | — | Maryland |
| 35 | Frank Galla | 41 | Son | — | Maryland |
| 36 | William Galla | 39 | Son | — | Maryland |
| 37 | George Galla | 37 | Son | — | Maryland |
| 38 | John Galla | 35 | Son | Baker | Maryland |
| 39 | Mary Galla | 33 | Daughter | — | Maryland |
| 40 | James Galla | 31 | Son | — | Maryland |
| 41 | Robert Galla | 25 | Son | Chauffeur | Maryland |
| 42 | Catherine Galla | 23 | Daughter | — | Maryland |
| 43 | John Galla | 34 | Son-in-law | Foreman | Maryland |
| 44 | Margaret Galla | 27 | Daughter | — | Maryland |
| 45 | Margaret Galla | 3 | Granddaughter | — | Maryland |
| 46 | Horace Derr | 33 | Head | Electrician | Maryland |
| 47 | Catherine Derr | 33 | Wife | — | Maryland |
| 48 | Horace Derr | 10 | Son | — | Maryland |
| 49 | Catherine Derr | 11 | Daughter | — | Maryland |
| 50 | Florence Derr | 66 | Mother-in-law | — | Maryland |
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)