JM
John Mcdermott — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Montgomery, Pennsylvania
Our Model Tree links this John Mcdermott across the 1910 and 1920 US Censuses in Montgomery, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1900), then head of a 9-person household.
Age 20
b. ~1900
Male
Son
Born: Pennsylvania
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Montgomery, Pennsylvania |
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Salesman |
| Industry | Coal |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Salesman |
| Township / Ward | Jenkintown Borough Part Of |
| Est. Birth Year | ~1900 |
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.
9 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Mcdermott | Daughter | — | 17 | ~1903 |
| Catherine Mcdermott | Daughter | — | 18 | ~1902 |
| Anna Mcdermott | Daughter | — | 21 | ~1899 |
| Patrick Mcdermott | Head | — | 53 | ~1867 |
| Francis Mcdermott | Son | — | 15 | ~1905 |
| John Mcdermott | Son | — | 20 | ~1900 |
| James Mcdermott | Son | — | 14 | ~1906 |
| Joseph Mcdermott | Son | — | 7 | ~1913 |
| Winifred Mcdermott | Spouse | — | 42 | ~1878 |
Census Appearances
1910
Montgomery, Pennsylvania
Son, age 10
Montgomery, Pennsylvania · implied b. ~1900 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Montgomery, Pennsylvania
Son, age 20
Montgomery, Pennsylvania · implied b. ~1900 — 9 household members
| Surname | McDermott |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Salesman |
| Industry | Coal |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| 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 (1910 and 1920) in Montgomery, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
John Mcdermott
Son · 1920 · age 20 · b. ~1900 · Pennsylvania
★ You are viewing this record
Sibling
Francis Mcdermott
Sibling · 1920 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Mcdermott
Sibling · 1920 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcdermott
Sibling · 1920 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Mcdermott
Sibling · 1920 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mcdermott
Sibling · 1920 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Mcdermott
Sibling · 1920 · 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
1920 US Federal Census — Montgomery, Pennsylvania
Open full size
1920 US Federal Census — Montgomery, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1604unit:0207)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John R Plunkett | 44 | Head | Tapelayer | Pennsylvania |
| 52 | Alice Plunkett | 42 | Wife | — | Pennsylvania |
| 53 | Richard Plunkett | 19 | Son | — | Pennsylvania |
| 54 | Margaret Plunkett | 17 | Daughter | — | Pennsylvania |
| 55 | Russell Plunkett | 16 | Son | — | Pennsylvania |
| 56 | Elizabeth Plunkett | 10 | Daughter | — | Pennsylvania |
| 57 | Catherine Plunkett | 9 | Daughter | — | Pennsylvania |
| 58 | William Plunkett | 4 | Son | — | Pennsylvania |
| 59 | John H Dillon | 53 | Head | — | Pennsylvania |
| 60 | Catherine Dillon | 47 | Wife | Needlewoman | Ireland |
| 61 | Margaret Dillon | 11 | Daughter | — | Pennsylvania |
| 62 | Arthur Garis | 41 | Head | Conductor | Pennsylvania |
| 63 | Ada Garis | 39 | Wife | — | Pennsylvania |
| 64 | Byron Garis | 9 | Son | — | Pennsylvania |
| 65 | Mary J Kelley | 79 | Mother-in-law | — | Pennsylvania |
| 66 | Fred Myers | 29 | Head | Chauffeur | Pennsylvania |
| 67 | Anna Myers | 28 | Wife | — | Pennsylvania |
| 68 | Catherine Myers | 1 | Daughter | — | Pennsylvania |
| 69 | John O'Donnell | 58 | Head | Well Driller | Ireland |
| 70 | Mary O'Donnell | 60 | Wife | — | Pennsylvania |
| 71 | John O'Donnell | 30 | Son | Plumber | Pennsylvania |
| 72 | William O'Donnell | 22 | Son | Salesman | Pennsylvania |
| 73 | Joseph O'Donnell | 20 | Son | Bookkeeper | Pennsylvania |
| 74 | William Devinney | 46 | Brother-in-law | Chauffeur | Pennsylvania |
| 75 | Cecelia Walsh | 49 | Head | — | Ireland |
| 76 | Mary Walsh | 21 | Daughter | Stenographer | Pennsylvania |
| 77 | Helen Walsh | 19 | Daughter | — | Pennsylvania |
| 78 | Charles Walsh | 16 | Son | — | Pennsylvania |
| 79 | Edward Walsh | 14 | Son | — | Pennsylvania |
| 80 | Margaret Walsh | 12 | Daughter | — | Pennsylvania |
| 81 | John Walsh | 10 | Son | — | Pennsylvania |
| 82 | Dennis Crotty | 36 | Head | Carpenter | Pennsylvania |
| 83 | Matilda Crotty | 34 | Wife | — | Germany |
| 84 | Dorothy Crotty | 2 | Daughter | — | Pennsylvania |
| 85 | Edward Crotty | 1 | Son | — | Pennsylvania |
| 86 | Joseph Altenbaur | 56 | Father-in-law | Timekeeper | Germany |
| 87 | Agatha Altenbaur | 51 | Mother-in-law | — | Pennsylvania |
| 88 | Patrick Mcdermott | 53 | Head | Stone Mason | Ireland |
| 89 | Winifred Mcdermott | 42 | Wife | — | Ireland |
| 90 | Anna Mcdermott | 21 | Daughter | — | Pennsylvania |
| 91 | John Mcdermott THIS PERSON | 20 | Son | Salesman | Pennsylvania |
| 92 | Catherine Mcdermott | 18 | Daughter | Operator | Pennsylvania |
| 93 | Elizabeth Mcdermott | 17 | Daughter | — | Pennsylvania |
| 94 | Francis Mcdermott | 15 | Son | — | Pennsylvania |
| 95 | James Mcdermott | 14 | Son | — | Pennsylvania |
| 96 | Joseph Mcdermott | 7 | Son | — | Pennsylvania |
| 97 | John Fox | 52 | Head | Gardener | Ireland |
| 98 | Elizabeth Fox | 40 | Wife | — | Pennsylvania |
| 99 | Robert Fox | 16 | Son | — | Pennsylvania |
| 100 | Elizabeth Fox | 15 | Daughter | — | Pennsylvania |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)