JD
John Donaldson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Donaldson across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 6-person household.
Age 20
b. ~1920
Male
Son
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Donaldson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | C-1 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1920 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| William Donaldson | Son | — | 13 | ~1927 |
| Walter Donaldson | Head | — | 65 | ~1875 |
| John Donaldson | Son | — | 20 | ~1920 |
| Joseph Donaldson | Son | — | 21 | ~1919 |
| Nancy Donaldson | Daughter | — | 17 | ~1923 |
| Donaldson | Spouse | — | 50 | ~1890 |
Census Appearances
1930
Allegheny, Pennsylvania
Son, age 10
Allegheny, Pennsylvania · implied b. ~1920 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donaldson |
| Given Name | John Boyer |
| 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/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Son, age 20
Allegheny-County, Pennsylvania · implied b. ~1920 — 6 household members
| Surname | Donaldson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Income (1939) | 0 |
| Highest Grade | C-1 |
| 1935 Residence | Same House |
| 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 John Donaldson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Donaldson
Son · 1940 · age 20 · b. ~1920 · Pennsylvania
★ You are viewing this record
Sibling
William Donaldson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Donaldson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Donaldson
Sibling · 1940 · age 21
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
1940 US Federal Census — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03655-00759)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Charlotte Lippow | 41 | Wife | — | Pennsylvania |
| 42 | Helen Lippow | 18 | Daughter | — | Pennsylvania |
| 43 | John Lippow | 16 | Son | — | Pennsylvania |
| 44 | Gertrude Hengley | 22 | Servant | Servant | Pennsylvania |
| 45 | Anna Campbell | 63 | Head | Keeper | England |
| 46 | Helen Anderson | 47 | Guest | Teacher | Pennsylvania |
| 47 | Louise Hogue | 47 | Lodger | Stenographer | Pennsylvania |
| 48 | Marie Conley | 58 | Lodger | Teacher | Maryland |
| 49 | Frederick Skinner | 68 | Lodger | Clerk | Illinois |
| 50 | Ada Brown Conrad | 49 | Lodger | Office Clerk | Pennsylvania |
| 51 | Anna L. Flynn | 62 | Lodger | Manager Bookkeeper | Connecticut |
| 52 | Elizabeth Bonner | 60 | Lodger | Office Clerk | Pennsylvania |
| 53 | Charles Mazon | 48 | Head | Judge Stenographer | Pennsylvania |
| 54 | Dorothy Mazon | 45 | Wife | — | Pennsylvania |
| 55 | Dorothea Mazon | 25 | Daughter | Utility Clerk | Pennsylvania |
| 56 | Mary Jane Mazon | 23 | Daughter | Stenographer | Pennsylvania |
| 57 | Charles Mazon | 21 | Son | Office Clerk | Pennsylvania |
| 58 | Rosemary Mazon | 17 | Daughter | — | Pennsylvania |
| 59 | James Mazon | 13 | Son | — | Pennsylvania |
| 60 | Walter Donaldson | 65 | Head | Physician | Pennsylvania |
| 61 | Nan Donaldson | 50 | Wife | — | Pennsylvania |
| 62 | Joseph Donaldson | 21 | Son | — | Pennsylvania |
| 63 | John Donaldson THIS PERSON | 20 | Son | — | Pennsylvania |
| 64 | Nancy Donaldson | 17 | Daughter | — | Pennsylvania |
| 65 | William Donaldson | 13 | Son | — | Pennsylvania |
| 66 | Michael Hannon | 44 | Head | Electrician | Irish Free State |
| 67 | Rose Hannon | 43 | Wife | — | Irish Free State |
| 68 | Mary Hannon | 21 | Daughter | Secretary | Pennsylvania |
| 69 | James Hannon | 19 | Son | — | Pennsylvania |
| 70 | Rosella Hannon | 15 | Daughter | — | Pennsylvania |
| 71 | Edward Hannon | 16 | Son | — | Pennsylvania |
| 72 | Marie Hannon | 11 | Daughter | — | Pennsylvania |
| 73 | Catherine Murphy | 50 | Servant | Servant | Irish Free State |
| 74 | George Meiers | 48 | Head | Attorney | Pennsylvania |
| 75 | Marie Meiers | 48 | Wife | — | Pennsylvania |
| 76 | Mary Meiers | 24 | Daughter | Attorney | Pennsylvania |
| 77 | Ruth Meiers | 22 | Daughter | — | Pennsylvania |
| 78 | Mildred Meiers | 20 | Daughter | — | Pennsylvania |
| 79 | George Meiers | 16 | Son | — | Pennsylvania |
| 80 | Carl Meiers | 10 | Son | — | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)