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Thomas Donnelly — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mahoning-County, Ohio
Our Model Tree links this Thomas Donnelly across the 1920, 1930 and 1940 US Censuses in Mahoning-County, Ohio (XGBoost, ~Confirmed), with identified parents James & Margaret — first a head (b.~1906), then head of a 4-person household.
Age 34
b. ~1906
Male
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Mahoning-County, Ohio |
| Surname | Donnelly |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Youngstown city |
| 1935 Residence (County) | Mahoning |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Electrician |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1600 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Electrician |
| Township / Ward | Youngstown City |
| Est. Birth Year | ~1906 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Florence Donnelly | Spouse | — | 30 | ~1910 |
| Gloria Donnelly | Daughter | — | 10 | ~1930 |
| Tommy Donnelly | Son | — | 7 | ~1933 |
| Thomas Donnelly | Head | — | 34 | ~1906 |
Census Appearances
1920
Mahoning, Ohio
Son, age 13
Mahoning, Ohio · implied b. ~1907 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | Thomas |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Scotland |
| Year of Immigration | 1911 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Ireland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Scotch |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1930
Mahoning, Ohio
Head, age 23
Mahoning, Ohio · implied b. ~1907 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Donnelly |
| Given Name | Thomas J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1910 |
| Age at First Marriage | 21 |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Scotland |
| Occupation | Steel Worker |
| Industry | Steel Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Scotch |
| Home Owned/Rented | R |
| Home Value / Rent | 20 |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Mahoning-County, Ohio
Head, age 34
Mahoning-County, Ohio · implied b. ~1906 — 4 household members
| Surname | Donnelly |
| Given Name | Thomas |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Youngstown city |
| 1935 Residence (County) | Mahoning |
| Naturalization Status | Naturalized |
| Occupation | Electrician |
| Industry | Steel Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1600 |
| Highest Grade | H 1 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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 Thomas Donnelly across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Donnelly (~0.92 confidence) and mother Margaret Donnelly (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Donnelly
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Margaret Donnelly
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Donnelly
Head · 1940 · age 34 · b. ~1906 · Ohio
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Mahoning-County, Ohio
Open full size
1940 US Federal Census — Mahoning-County, Ohio
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03267-00602)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John D. Hodge | 74 | Head | Superintendent | Scotland |
| 2 | Jessie Hodge | 72 | Wife | — | Scotland |
| 3 | Benjamin Taylor | 62 | Head | Janitor | New York |
| 4 | Minnie Taylor | 61 | Wife | — | Pennsylvania |
| 5 | Joseph F. Smith | 77 | Head | Automobile Parts | Maryland |
| 6 | Helen Smith | 50 | Daughter | — | Ohio |
| 7 | Betty Jean Smith | 15 | Granddaughter | — | Ohio |
| 8 | John Beachler | 76 | Lodger | — | Pennsylvania |
| 9 | Thomas Donnelly THIS PERSON | 34 | Head | Electrician | Scotland |
| 10 | Florence Donnelly | 30 | Wife | — | Ohio |
| 11 | Gloria Donnelly | 10 | Daughter | — | Ohio |
| 12 | Tommy Donnelly | 7 | Son | — | Ohio |
| 13 | Victor Smith | 40 | Head | Truck Driver | Ohio |
| 14 | Mary H. Smith | 39 | Wife | — | Ohio |
| 15 | Victor Jr. Smith | 13 | Son | — | Ohio |
| 16 | Mary Lou Smith | 12 | Daughter | — | Ohio |
| 17 | John Smith | 9 | Son | — | Ohio |
| 18 | Donna Rita Smith | 8 | Daughter | — | Ohio |
| 19 | Susan Smith | 5 | Daughter | — | Ohio |
| 20 | Joseph Smith | 4 | Son | — | Ohio |
| 21 | E. J. Brown | 30 | Head | Electrician | Pennsylvania |
| 22 | Margaret Brown | 60 | Mother | — | Pennsylvania |
| 23 | — | None | — | — | — |
| 24 | — | None | — | — | — |
| 25 | — | None | — | — | — |
| 26 | — | None | — | — | — |
| 27 | Evelyn Jefferson | 33 | Head | — | South Carolina |
| 28 | Robert Jefferson | 37 | Husband | Laborer | South Carolina |
| 29 | Robert Jr. Jefferson | 13 | Son | — | Ohio |
| 30 | Howard Jefferson | 12 | Son | — | Ohio |
| 31 | Willie Jefferson | 11 | Son | — | Ohio |
| 32 | Betty Louise Jefferson | 9 | Daughter | — | Ohio |
| 33 | Lawrence B. Jefferson | 7 | Son | — | Ohio |
| 34 | Madeline L. Jefferson | 3 | Daughter | — | Ohio |
| 35 | Harold Jefferson | 1 | Son | — | Ohio |
| 36 | Kelly Hutchinson | 28 | Lodger | Truck Driver | Tennessee |
| 37 | Eddy Thomas | 45 | Head | Proprietor | Greece |
| 38 | Josephine Thomas | 35 | Wife | — | Pennsylvania |
| 39 | Minas Koutsoukos | 46 | Lodger | Cook | Greece |
| 40 | Tom Mantgaris | 51 | Lodger | Proprietor | Greece |
Pedigree Summary
Thomas
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)