RJ
Robert Johnson — 1930 US Census Record
Model Tree available1930 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Robert Johnson across the 1910, 1920 and 1930 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed), with identified parents Robert & Alexander — first a son (b.~1909), then head of a 5-person household.
Age 21
b. ~1909
Male
Son
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Philadelphia, Pennsylvania |
| Surname | Johnson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Occupation | Salesman |
| Industry | Fuel Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Salesman |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1909 |
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.
5 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Alexander Johnson | Head | — | 54 | ~1876 |
| Charles Mccord | Other | — | 45 | ~1885 |
| Robert Johnson | Son | — | 21 | ~1909 |
| Gordon Johnson | Son | — | 19 | ~1911 |
| Jessie Johnson | Spouse | — | 49 | ~1881 |
Census Appearances
1910
Philadelphia, Pennsylvania
Son, age 1
Philadelphia, Pennsylvania · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Philadelphia, Pennsylvania
Son, age 10
Philadelphia, Pennsylvania · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Son, age 21
Philadelphia, Pennsylvania · implied b. ~1909 — 5 household members
| Surname | Johnson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Salesman |
| Industry | Fuel Co. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Robert Johnson across 3 US Census years (1910, 1920 and 1930) in Philadelphia, Pennsylvania, using XGBoost record linkage. Identified parents: father Robert Johnson (~0.92 confidence) and father Alexander Johnson (~0.92 confidence) and father George Johnson (~0.92 confidence) and mother Jessie Johnson (~0.92 confidence) and mother Mary Johnson (~0.92 confidence) and mother Catherine Johnson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Robert Johnson
b. ~1872
Source father
● Household
· direct · ~0.92
Father
Alexander Johnson
b. ~1876
Source father
● Household
· direct · ~0.92
Father
George Johnson
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Jessie Johnson
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
Mary Johnson
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
Catherine Johnson
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Johnson
Son · 1930 · age 21 · b. ~1909 · Pennsylvania
★ You are viewing this record
Sibling
Gordon Johnson
Sibling · 1930 · age 19
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 — Philadelphia, Pennsylvania
Open full size
1930 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2119:0791)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Eugene Herberle | 61 | Head | Iron Worker | France |
| 2 | Mary Lange | 60 | Head | — | Pennsylvania |
| 3 | Robert Lange | 32 | Son | Assistant | Pennsylvania |
| 4 | Sarah Lange | 22 | Sister | Dress Maker | Pennsylvania |
| 5 | Mary Fitzpatrick | 43 | Lodger | Office Clerk | Pennsylvania |
| 6 | George Everett | 34 | Head | Carpenter | Pennsylvania |
| 7 | Eva Everett | 26 | Wife | — | Pennsylvania |
| 8 | Adelaide Everett | 10 | Daughter | — | Pennsylvania |
| 9 | William Everett | 6 | Son | — | Pennsylvania |
| 10 | Ruth Everett | 3 | Daughter | — | Pennsylvania |
| 11 | Harry Mackson | 52 | Lodger | Butcher | Pennsylvania |
| 12 | Harry Morris | 61 | Head | — | New Jersey |
| 13 | Bertha Morris | 26 | Daughter | Stenographer | New Jersey |
| 14 | Clarence O'Donnell | 38 | Head | Roofer | Pennsylvania |
| 15 | Anna O'Donnell | 37 | Wife | — | Pennsylvania |
| 16 | Clement O'Donnell | 13 | Son | — | Pennsylvania |
| 17 | Leona O'Donnell | 11 | Daughter | — | Pennsylvania |
| 18 | Marie O'Donnell | 10 | Daughter | — | Pennsylvania |
| 19 | Helen O'Donnell | 6 | Daughter | — | Pennsylvania |
| 20 | Marjorie O'Donnell | 4 | Daughter | — | Pennsylvania |
| 21 | H. Zimmerman | 33 | Head | Brakeman | Pennsylvania |
| 22 | Eva Zimmerman | 32 | Wife | — | Pennsylvania |
| 23 | Helen Zimmerman | 8 | Daughter | — | Pennsylvania |
| 24 | Claire Zimmerman | 11 | Son | — | Pennsylvania |
| 25 | Irvin Zimmerman | 10 | Son | — | Pennsylvania |
| 26 | Robert Zimmerman | 5 | Son | — | Pennsylvania |
| 27 | Joseph Marsell | 48 | Head | Inspector | Pennsylvania |
| 28 | Hettie Marsell | 44 | Wife | — | New Jersey |
| 29 | Joseph Jr. Marsell | 18 | Son | Stock Man | Pennsylvania |
| 30 | John Marsell | 17 | Son | Stock Man | Pennsylvania |
| 31 | Cora Vanderblee | 62 | Head | — | Pennsylvania |
| 32 | John Vanderblee | 32 | Son | Engineer | Pennsylvania |
| 33 | Ruth Vanderblee | 27 | Daughter | — | Pennsylvania |
| 34 | Cora Vanderblee | 7 | Granddaughter | — | Pennsylvania |
| 35 | Joan Vanderblee | 6 | Granddaughter | — | Pennsylvania |
| 36 | John Vanderblee | 2 | Grandson | — | Pennsylvania |
| 37 | Alexander Johnson | 54 | Head | Salesman | Pennsylvania |
| 38 | Jessie Johnson | 49 | Wife | — | Pennsylvania |
| 39 | Robert Johnson THIS PERSON | 21 | Son | Salesman | Pennsylvania |
| 40 | Gordon Johnson | 19 | Son | Draftsman | Pennsylvania |
| 41 | Charles Mccord | 45 | Brother-in-law | Mechanic | Pennsylvania |
| 42 | David Kramer | 47 | Head | Conductor | Pennsylvania |
| 43 | Mary Kramer | 47 | Wife | — | Pennsylvania |
| 44 | Clara Kramer | 65 | Mother | — | Pennsylvania |
| 45 | Esther Chapman | 51 | Head | — | Poland |
| 46 | David Chapman | 30 | Son | Office Clerk | Pennsylvania |
| 47 | Philip Chapman | 28 | Son | Salesman | Pennsylvania |
| 48 | Mary Chapman | 23 | Daughter | — | Pennsylvania |
| 49 | Joseph Chapman | 21 | Son | — | Pennsylvania |
| 50 | Nathan Chapman | 19 | Son | Salesman | Pennsylvania |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 6 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)