JM
John Mcdermott — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this John Mcdermott across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1877), then head of a 13-person household.
Age 63
b. ~1877
Male
Head
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Night Watch. |
| Industry | Railways |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Night Watch. |
| Township / Ward | Pittsburgh City |
| Est. Birth Year | ~1877 |
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.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Dolores Mcdermott | Daughter | — | 10 | ~1930 |
| Anna Mcdermott | Daughter | — | 13 | ~1927 |
| Claire Mcdermott | Daughter | — | 4 | ~1936 |
| Rita Mcdermott | Daughter | — | 22 | ~1918 |
| Genevieve Mcdermott | Daughter | — | 18 | ~1922 |
| Elizabeth Mcdermott | Daughter | — | 16 | ~1924 |
| Alice Mcdermott | Daughter | — | 9 | ~1931 |
| Rose Mcdermott | Daughter | — | 6 | ~1934 |
| John Mcdermott | Head | — | 63 | ~1877 |
| John Mcdermott | Son | — | 20 | ~1920 |
| Joseph Mcdermott | Son | — | 26 | ~1914 |
| William Mcdermott | Son | — | 4 | ~1936 |
| Elizabeth Mcdermott | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Allegheny, Pennsylvania
Head, age 52
Allegheny, Pennsylvania · implied b. ~1878 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 31 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Laborer |
| Industry | Steel Works |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 2000 |
| Radio Set | R |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Head, age 63
Allegheny-County, Pennsylvania · implied b. ~1877 — 13 household members
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 63 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Occupation | Night Watch. |
| Industry | Railways |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| 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 Mcdermott across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcdermott
Head · 1940 · age 63 · b. ~1877 · Pennsylvania
★ 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 — 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-t0627-03676-00675)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Gaber | 28 | Wife | — | Pennsylvania |
| 2 | John Koval | 54 | Head | Laborer | Russia |
| 3 | Mary Koval | 48 | Wife | — | Austria |
| 4 | Newton Koval | 11 | Son | — | Pennsylvania |
| 5 | Mary Lazar | 80 | Mother-in-law | — | Austria |
| 6 | John Miller | 78 | Head | — | Germany |
| 7 | John Mcdermott THIS PERSON | 63 | Head | Night Watch. | Pennsylvania |
| 8 | Elizabeth Mcdermott | 47 | Wife | — | Pennsylvania |
| 9 | Joseph Mcdermott | 26 | Son | Miner | Pennsylvania |
| 10 | Rita Mcdermott | 22 | Daughter | Domestic | Pennsylvania |
| 11 | John Mcdermott | 20 | Son | Laborer | Pennsylvania |
| 12 | Genevieve Mcdermott | 18 | Daughter | Domestic | Pennsylvania |
| 13 | Elizabeth Mcdermott | 16 | Daughter | — | Pennsylvania |
| 14 | Anna Mae Mcdermott | 13 | Daughter | — | Pennsylvania |
| 15 | Dolores Mcdermott | 10 | Daughter | — | Pennsylvania |
| 16 | Alice Mcdermott | 9 | Daughter | — | Pennsylvania |
| 17 | Rose Mcdermott | 6 | Daughter | — | Pennsylvania |
| 18 | Claire Mcdermott | 4 | Daughter | — | Pennsylvania |
| 19 | William Mcdermott | 4 | Son | — | Pennsylvania |
| 20 | William J. Palmer | 54 | Head | Laborer | Wales |
| 21 | Elizabeth Palmer | 50 | Wife | — | Pennsylvania |
| 22 | Robert Palmer | 24 | Son | Laborer | Pennsylvania |
| 23 | John Palmer | 22 | Son | Laborer | Pennsylvania |
| 24 | Edith Palmer | 20 | Daughter | — | Pennsylvania |
| 25 | Lloyd Palmer | 18 | Son | — | Pennsylvania |
| 26 | Sydney Palmer | 16 | Son | — | Pennsylvania |
| 27 | Edward Palmer | 14 | Son | — | Pennsylvania |
| 28 | Elizabeth Palmer | 13 | Daughter | — | Pennsylvania |
| 29 | Thomas Palmer | 10 | Son | — | Pennsylvania |
| 30 | Lee J. Keber | 53 | Head | Carpenter | Pennsylvania |
| 31 | Helen M. Keber | 42 | Wife | — | Pennsylvania |
| 32 | George Keber | 16 | Son | — | Pennsylvania |
| 33 | Frederick Krumheuer | 50 | Head | Carpenter | Pennsylvania |
| 34 | Clara Krumheuer | 46 | Wife | — | Pennsylvania |
| 35 | Margaret Krumheuer | 21 | Daughter | — | Pennsylvania |
| 36 | James Krumheuer | 20 | Son | Salesclerk | Pennsylvania |
| 37 | Lois Krumheuer | 15 | Daughter | — | Pennsylvania |
| 38 | Philomena Krumheuer | 80 | Mother | — | Pennsylvania |
| 39 | Anthony Stumpf | 40 | Head | Labor | Pennsylvania |
| 40 | Virginia Stumpf | 25 | Wife | — | Alabama |
Related Census Records
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)