JC
John Clarke — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this John Clarke across the 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed) — first a son (b.~1921), then head of a 9-person household.
Age 9
b. ~1921
Male
Son
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Clarke |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Utah |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Harbor View Eastern Avenue |
| Est. Birth Year | ~1921 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Clarke | Son | — | 9 | ~1921 |
| Herman Clarke | Son | — | 12 | ~1918 |
| Catharine Clarke | Daughter | — | 1 | ~1929 |
| Ralph Clarke | Son | — | 16 | ~1914 |
| Christina Clarke | Spouse | — | 38 | ~1892 |
| Ralph Clarke | Head | — | 39 | ~1891 |
| Martin Weeta | Other | — | 21 | ~1909 |
| Jacob Clarke | Son | — | 5 | ~1925 |
| Elizabeth Clarke | Daughter | — | 14 | ~1916 |
Census Appearances
1930
Baltimore, Maryland
Son, age 9
Baltimore, Maryland · implied b. ~1921 — 9 household members
| Surname | Clarke |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Utah |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Head, age 20
Baltimore-County, Maryland · implied b. ~1920 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore |
| 1935 Residence (County) | Baltimore |
| Occupation | Truck driver |
| Industry | Saw mill |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 600 |
| Highest Grade | No 6 |
| 1935 Residence | Maryland |
| 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 Clarke across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Clarke
Son · 1930 · age 9 · b. ~1921 · Maryland
★ You are viewing this record
Sibling
Ralph Clarke
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Clarke
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jacob Clarke
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Herman Clarke
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catharine Clarke
Sibling · 1930 · age 1
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:1930:15thcensus847unit:0037)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Loretta K. Mitchell | 14 | Daughter | — | Maryland |
| 2 | Dorothy J. Mitchell | 11 | Daughter | — | Maryland |
| 3 | Otto H. Zable | 48 | Head | Insulator | Maryland |
| 4 | Florence M. Zable | 49 | Wife | — | Maryland |
| 5 | William H. Zable | 10 | Son | — | Maryland |
| 6 | Berton V. Taylor | 58 | Boarder | Roller | Maryland |
| 7 | Frank Paul | 40 | Head | Watch Maker | Scotland |
| 8 | Margaret M. Paul | 31 | Wife | — | Scotland |
| 9 | Albert J. Fagan | 54 | Head | Stationary Engineer | Maine |
| 10 | Ralph W. Clarke | 39 | Head | Machinist | Utah |
| 11 | Christina Clarke | 38 | Wife | — | Maryland |
| 12 | Ralph W. Jr. Clarke | 16 | Son | — | Maryland |
| 13 | Elizabeth Clarke | 14 | Daughter | — | Maryland |
| 14 | Herman Clarke | 12 | Son | — | Maryland |
| 15 | John Clarke THIS PERSON | 9 | Son | — | Maryland |
| 16 | Jacob Clarke | 5 | Son | — | Maryland |
| 17 | Catharine Clarke | 1 | Daughter | — | Maryland |
| 18 | Martin J. Weeta | 21 | Son-in-law | Catcher | West Virginia |
| 19 | Jens C. Olsen | 40 | Head | Motorman | Norway |
| 20 | Eva K. Olsen | 30 | Wife | Tailor | Maryland |
| 21 | Jens C. Jr. Olsen | 0 | Son | — | Maryland |
| 22 | Ruth E. Olsen | 10 | Daughter | — | Maryland |
| 23 | Christian Bremer | 38 | Head | Machinist | Germany |
| 24 | Margaret Bremer | 45 | Wife | — | Germany |
| 25 | John M. Schneidman | 40 | Head | Roller | Maryland |
| 26 | Mary Schneidman | 44 | Wife | — | Maryland |
| 27 | Frederick Schneidman | 24 | Son | Co Roller | Maryland |
| 28 | Helen Schneidman | 22 | Daughter-in-law | — | Maryland |
| 29 | George Schneidman | 25 | Head | Clerk | Maryland |
| 30 | Clara Schneidman | 20 | Wife | Typist | Maryland |
| 31 | Samuel Bloom | 38 | Boarder | Printer | Maryland |
| 32 | Frederick C. Young | 42 | Head | Bricklayer | Germany |
| 33 | Lillian H. Young | 35 | Wife | — | Maryland |
| 34 | Walter E. Young | 40 | Brother | Bricklayer | Maryland |
| 35 | Philip E. Yettchen | 26 | Head | Truck Driver | Maryland |
| 36 | Mary B. Yettchen | 24 | Wife | — | Maryland |
| 37 | Philip E. Jr. Yettchen | 2 | Son | — | Maryland |
| 38 | Robert E. Yettchen | 0 | Son | — | Maryland |
| 39 | Henry Hague | 63 | Father-in-law | Millwright | Germany |
| 40 | Joseph B. Droll | 45 | Head | Machinist | Minnesota |
| 41 | Marie J. Droll | 37 | Wife | — | Maryland |
| 42 | Joseph B. Droll | 13 | Son | — | Maryland |
| 43 | Arthur C. Mccormack | 37 | Head | Electrician | Pennsylvania |
| 44 | Johanna Mccormack | 39 | Wife | — | Maryland |
| 45 | Wesley Mccormack | 15 | Son | — | Maryland |
| 46 | Arthur C. Jr. Mccormack | 12 | Son | — | Virginia |
| 47 | George S. Reinhart | 43 | Head | Heater'S Helper | Pennsylvania |
| 48 | Bertha Reinhart | 43 | Wife | — | District of Columbia |
| 49 | Milton Reinhart | 21 | Son | Matcher | Maryland |
| 50 | Tilden Reinhart | 15 | Son | — | Virginia |
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)