MJ
Martin Johnson — 1930 US Census Record
Model Tree available1930 United States Federal Census · Baltimore, Maryland
Our Model Tree links this Martin Johnson across the 1920, 1930 and 1940 US Censuses in Baltimore, Maryland (XGBoost, ~Confirmed), with identified parents Catherine & Dewitt — first a son (b.~1918), then head of a 3-person household.
Age 12
b. ~1918
Male
Son
Born: Maryland
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Baltimore, Maryland |
| Surname | Johnson |
| Given Name | Martin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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 | ~1918 |
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 Martin | Age | Birth yr |
|---|---|---|---|---|
| Ruth Johnson | Head | — | 33 | ~1897 |
| Charles Johnson | Son | — | 14 | ~1916 |
| Martin Johnson | Son | — | 12 | ~1918 |
Census Appearances
1920
Baltimore, Maryland
Son, age 2
Baltimore, Maryland · implied b. ~1918 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Melvin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Son, age 12
Baltimore, Maryland · implied b. ~1918 — 3 household members
| Surname | Johnson |
| Given Name | Martin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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 |
Son, age 23
Baltimore-City-County, Maryland · implied b. ~1917 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Melvin G |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | BALTIMORE CITY |
| 1935 Residence (County) | Baltimore City |
| Occupation | Grocery Clerk |
| Industry | Retail Food Market |
| Class of Worker | PW |
| Hours Worked | 59 |
| Income (1939) | 832 |
| Highest Grade | H 2 |
| 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 Martin Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Catherine Johnson (~0.92 confidence) and father Dewitt Johnson (~0.92 confidence) and mother Agnes Johnson (~0.92 confidence) and mother Ruth Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Catherine Johnson
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
Dewitt Johnson
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Agnes Johnson
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Ruth Johnson
b. ~1897
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Martin Johnson
Son · 1930 · age 12 · b. ~1918 · Maryland
★ You are viewing this record
Sibling
Charles Johnson
Sibling · 1930 · 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
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:1930:15thcensus864unit:0197)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Evelyn Fitzgerald | 42 | Wife | — | Virginia |
| 52 | James Fitzgerald | 15 | Son | Office Practice | Maryland |
| 53 | Jack Fitzgerald | 13 | Son | — | Maryland |
| 54 | Gregory Fitzgerald | 11 | Son | — | Maryland |
| 55 | Albert Fitzgerald | 9 | Son | — | Maryland |
| 56 | Margaret Fitzgerald | 7 | Daughter | — | Maryland |
| 57 | Mary Fitzgerald | 6 | Daughter | — | Maryland |
| 58 | Kathryn Fitzgerald | 4 | Daughter | — | Maryland |
| 59 | Joseph Fitzgerald | 1 | Son | — | Maryland |
| 60 | William Cox | 59 | Head | Shipsmith | Virginia |
| 61 | Nora Cox | 56 | Wife | — | Virginia |
| 62 | James Burch | 35 | Son-in-law | Motorman | Virginia |
| 63 | Emma Burch | 30 | Daughter | — | Maryland |
| 64 | James Burch | 10 | Grandson | — | Maryland |
| 65 | William Burch | 8 | Grandson | — | Maryland |
| 66 | Robert Burch | 7 | Grandson | — | Maryland |
| 67 | Thomas Kramer | 55 | Head | Baker | Germany |
| 68 | Marie Kramer | 40 | Wife | — | Maryland |
| 69 | Thomas Kramer | 16 | Son | Baker | Maryland |
| 70 | Elizabeth Kramer | 15 | Daughter | — | Maryland |
| 71 | Gertrude Kramer | 13 | Daughter | — | Maryland |
| 72 | Albert Kramer | 11 | Son | — | Maryland |
| 73 | Mildred Kramer | 4 | Daughter | — | Maryland |
| 74 | Andrew Bals | 38 | Head | Chauffeur | Maryland |
| 75 | Edna Bals | 37 | Wife | — | Maryland |
| 76 | Edna Bals | 15 | Daughter | — | Maryland |
| 77 | Louise Bals | 13 | Daughter | — | Maryland |
| 78 | Fred Dippel | 63 | Head | Shoemaker | Germany |
| 79 | Marie Dippel | 70 | Wife | — | Germany |
| 80 | Margaret Dippel | 35 | Daughter | — | Maryland |
| 81 | Kathryn Maddox | 69 | Head | — | Maryland |
| 82 | Edward Maddox | 33 | Son | Plumber | Maryland |
| 83 | George Maddox | 29 | Son | Office Clerk | Maryland |
| 84 | James Hanley | 55 | Head | Laborer | Maryland |
| 85 | Annie Hanley | 50 | Sister | — | Maryland |
| 86 | Mary Nicholson | 77 | Head | — | Maryland |
| 87 | Ruth Johnson | 33 | Head | Operator | Maryland |
| 88 | Charles Johnson | 14 | Son | — | Maryland |
| 89 | Martin Johnson THIS PERSON | 12 | Son | — | Maryland |
| 90 | Andrew Purves | 41 | Head | Floor Layer | Scotland |
| 91 | Jean Purves | 41 | Wife | — | Scotland |
| 92 | Barbara Purves | 16 | Daughter | — | Scotland |
| 93 | William Purves | 13 | Son | — | Scotland |
| 94 | Jean Purves | 10 | Daughter | — | Scotland |
| 95 | Frederick Schroely | 36 | Head | Mechanic | Maryland |
| 96 | Anna Schroely | 38 | Wife | — | Germany |
| 97 | — | None | — | — | — |
| 98 | — | None | — | — | — |
| 99 | — | None | — | — | — |
| 100 | — | None | — | — | — |
Related Census Records
Pedigree Summary
Martin + 1 sibling
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)