MD
Mary Duncan — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Mary Duncan across the 1900, 1910 and 1920 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1868), then head of a 3-person household.
Age 52
b. ~1868
Female
Spouse
Born: Ireland
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Philadelphia, Pennsylvania |
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1886 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Year of Naturalization | 1892 |
| Birthplace (normalized) | ireland |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1868 |
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.
3 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Duncan | Daughter | — | 22 | ~1898 |
| John Duncan | Head | — | 54 | ~1866 |
| Mary Duncan | Spouse | — | 52 | ~1868 |
Census Appearances
1900
Philadelphia, Pennsylvania
Other, age 28
Philadelphia, Pennsylvania · implied b. ~1872 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Boarder |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Ireland |
| Birth Month | Nov |
| Birth Year | 1872 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1910
Philadelphia, Pennsylvania
Spouse, age 42
Philadelphia, Pennsylvania · implied b. ~1868 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Ireland |
| Years Married | 23 |
| Children Born | 3 |
| Children Living | 3 |
| Year of Immigration | 1881 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Wholesale merchant |
| Industry | Groceries |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1920
Philadelphia, Pennsylvania
Spouse, age 52
Philadelphia, Pennsylvania · implied b. ~1868 — 3 household members
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1886 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth Country | Ireland |
| Year of Naturalization | 1892 |
| Birthplace (normalized) | ireland |
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 Mary Duncan across 3 US Census years (1900, 1910 and 1920) in Philadelphia, Pennsylvania, using XGBoost record linkage.
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This person
Anchor record
Mary Duncan
Spouse · 1920 · age 52 · b. ~1868 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Philadelphia, Pennsylvania
Open full size
1920 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1626unit:0849)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Jackson, Myrtle D Jackson | 14 | Daughter | — | Pennsylvania |
| 52 | Joseph H Jackson | 12 | Son | — | Pennsylvania |
| 53 | Lawrence Geoghegan | 44 | Head | Shipping Clerk | Ireland |
| 54 | Florence Geoghegan | 34 | Wife | — | Pennsylvania |
| 55 | Lawrence Jr Geoghegan | 9 | Son | — | Pennsylvania |
| 56 | Doris Geoghegan | 2 | Daughter | — | Pennsylvania |
| 57 | John G Duncan | 54 | Head | Watchman | Ireland |
| 58 | Mary Duncan THIS PERSON | 52 | Wife | — | Ireland |
| 59 | Mary E Duncan | 22 | Daughter | Stitcher | Pennsylvania |
| 60 | John Rogers | 35 | Head | Driver | Pennsylvania |
| 61 | Florence Rogers | 31 | Wife | — | England |
| 62 | Marie Rogers | 11 | Daughter | — | Pennsylvania |
| 63 | James Rogers | 9 | Son | — | Pennsylvania |
| 64 | John Rogers | 8 | Son | — | Pennsylvania |
| 65 | Edward Rogers | 7 | Son | — | Pennsylvania |
| 66 | Charles Rogers | 5 | Son | — | Pennsylvania |
| 67 | John Davis | 41 | Head | Hardwood Finisher | Pennsylvania |
| 68 | Kathryn Davis | 43 | Wife | — | Pennsylvania |
| 69 | Leola Davis | 15 | Daughter | — | Pennsylvania |
| 70 | John Davis | 13 | Son | — | Pennsylvania |
| 71 | George Simon | 25 | Head | Shipper | Pennsylvania |
| 72 | Carrie Simon | 22 | Wife | — | Pennsylvania |
| 73 | George Jr Simon | 3 | Son | — | Pennsylvania |
| 74 | Emily Simon | 0 | Daughter | — | Pennsylvania |
| 75 | Robert Nelson | 23 | Head | Weaver | Pennsylvania |
| 76 | Anna May Nelson | 21 | Wife | — | Pennsylvania |
| 77 | Genevieve Nelson | 3 | Daughter | — | Pennsylvania |
| 78 | Emma Worrell | 42 | Head | — | Pennsylvania |
| 79 | James Williamson | 48 | Boarder | Carpenter | Pennsylvania |
| 80 | William Oasman | 13 | Nephew | — | Pennsylvania |
| 81 | Charles Sr Helm | 47 | Head | Barber | Pennsylvania |
| 82 | Anna Helm | 40 | Wife | — | Pennsylvania |
| 83 | Charles Jr Helm | 17 | Son | Mechanic | Pennsylvania |
| 84 | David Dallas | 28 | Head | Draftsman | Pennsylvania |
| 85 | Mabel Dallas | 26 | Wife | — | England |
| 86 | Deborah Dallas | 3 | Daughter | — | Pennsylvania |
| 87 | Michael Klemp | 39 | Head | Teamster | Russia-Poland |
| 88 | Rosa Klemp | 32 | Wife | — | Hungary |
| 89 | John Klemp | 10 | Nephew | — | Poland |
| 90 | Samuel Campbell | 37 | Head | Electrician | Pennsylvania |
| 91 | Anna Campbell | 37 | Wife | — | Pennsylvania |
| 92 | Nelson Campbell | 12 | Son | — | Pennsylvania |
| 93 | George B Vasey | 23 | Head | Machinist | Pennsylvania |
| 94 | Elizabeth Vasey | 21 | Wife | — | Pennsylvania |
| 95 | George Jr Vasey | 1 | Son | — | Pennsylvania |
| 96 | John Moore | 41 | Head | Blocker | Philadelphia |
| 97 | Katherine Moore | 39 | Wife | — | Philadelphia |
| 98 | Katherine D Moore | 11 | Daughter | — | Philadelphia |
| 99 | Jennie Moore | 9 | Daughter | — | Philadelphia |
| 100 | William Simes | 48 | Uncle | Pan Filler | Pennsylvania |
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)