MD
Mary Duncan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Mary Duncan across the 1910, 1920 and 1930 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1853), then head of a 4-person household.
Age 77
b. ~1853
Female
Spouse
Born: Pennsylvania
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Philadelphia, Pennsylvania |
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 77 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 23 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1853 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Kate Duncan | Daughter | — | 54 | ~1876 |
| William Duncan | Head | — | 79 | ~1851 |
| Margaret Duncan | Other | — | 82 | ~1848 |
| Mary Duncan | Spouse | — | 77 | ~1853 |
Census Appearances
1910
Philadelphia, Pennsylvania
Spouse, age 58
Philadelphia, Pennsylvania · implied b. ~1852 — 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 | 58 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Years Married | 36 |
| Children Born | 5 |
| Children Living | 3 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | none |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Philadelphia, Pennsylvania
Spouse, age 67
Philadelphia, Pennsylvania · implied b. ~1853 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 67 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Spouse, age 77
Philadelphia, Pennsylvania · implied b. ~1853 — 4 household members
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 77 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 23 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | none |
| Can Read/Write | Yes |
| 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 Mary Duncan across 3 US Census years (1910, 1920 and 1930) in Philadelphia, Pennsylvania, using XGBoost record linkage.
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This person
Anchor record
Mary Duncan
Spouse · 1930 · age 77 · b. ~1853 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Philadelphia, Pennsylvania
Open full size
1930 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2103:0188)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Mary Kelleher | 61 | servant | Servant | Irish Free State |
| 52 | Lilla Myers | 63 | Head | None | Pennsylvania |
| 53 | Lewis Feingold | 59 | Head | Engineer | Pennsylvania |
| 54 | Henrietta A. Feingold | 56 | Wife | None | Pennsylvania |
| 55 | Allan J. Feingold | 23 | son | None | Pennsylvania |
| 56 | August J. Boody | 47 | Head | Hat Finisher | Pennsylvania |
| 57 | Marie Boody | 49 | Wife | None | Pennsylvania |
| 58 | Joseph Garrell | 49 | Head | Rivett Maker | North Carolina |
| 59 | Elizabeth J. Garrell | 45 | Wife | None | North Carolina |
| 60 | Alora E. Hendricks | 3 | niece | — | Pennsylvania |
| 61 | Mary J. Robinson | 75 | Head | None | Pennsylvania |
| 62 | Mary Robinson | 21 | daughter | None | Pennsylvania |
| 63 | Bessie Robinson | 29 | daughter | Designer | Pennsylvania |
| 64 | Gertrude Robinson | 24 | daughter | Stenographer | Pennsylvania |
| 65 | Calvin Frederick | 35 | Head | Foreman | Pennsylvania |
| 66 | Anna Frederick | 35 | Wife | None | Pennsylvania |
| 67 | Merrill Frederick | 14 | son | None | Pennsylvania |
| 68 | Ruth Frederick | 11 | daughter | None | Pennsylvania |
| 69 | Eleanor Frederick | 9 | daughter | None | Pennsylvania |
| 70 | Charles Tierney | 48 | Head | Draftsman | Pennsylvania |
| 71 | Lilla Tierney | 45 | Wife | None | Pennsylvania |
| 72 | Russell Tierney | 21 | son | None | Pennsylvania |
| 73 | John Harry Stephan | 52 | Head | Engineer | Pennsylvania |
| 74 | Helena Stephan | 54 | Wife | None | Pennsylvania |
| 75 | Robert Hopett | 65 | Head | Typer | Pennsylvania |
| 76 | Elizabeth Hopett | 59 | Wife | None | Pennsylvania |
| 77 | Clarence Hopett | 28 | son | Agent | Pennsylvania |
| 78 | Harlan Hopett | 26 | son | Clerk | Pennsylvania |
| 79 | Robert J. Hopett | 23 | son | Estimator | Pennsylvania |
| 80 | William Duncan | 79 | Head | Retired | Pennsylvania |
| 81 | Mary Duncan THIS PERSON | 77 | Wife | None | Pennsylvania |
| 82 | Kate Duncan | 54 | daughter | Teacher | Pennsylvania |
| 83 | Margaret Jane Duncan | 82 | sister | None | Pennsylvania |
| 84 | Gustav Jr. Kandra | 47 | Head | Superintendent | Germany |
| 85 | Ella Kandra | 41 | Wife | None | Pennsylvania |
| 86 | Paul Kandra | 12 | son | None | Pennsylvania |
| 87 | Calvin Kandra | 21 | son | Traveling Salesman | Pennsylvania |
| 88 | Henry Kummerer | 73 | Father-in-law | Janitor | Pennsylvania |
| 89 | Caroline Kummerer | 70 | Mother-in-law | None | Pennsylvania |
| 90 | John Moore | 45 | Head | Agent | Pennsylvania |
| 91 | Louise Moore | 41 | Wife | None | Pennsylvania |
| 92 | Florence Elizabeth Moore | 10 | daughter | None | Pennsylvania |
| 93 | George W. Moore | 6 | son | None | Pennsylvania |
| 94 | Jacob R. Miller | 76 | Head | Retired | Pennsylvania |
| 95 | Mary Ann Miller | 75 | Wife | None | Pennsylvania |
| 96 | Thomas J. Wellman | 54 | Head | Chauffeur | Pennsylvania |
| 97 | Ida May Wellman | 51 | Wife | None | Pennsylvania |
| 98 | Melvin C. Wellman | 23 | son | Student | Pennsylvania |
| 99 | John V. Wall | 26 | Head | Bookkeeper | Pennsylvania |
| 100 | Kathryn Wall | 23 | Wife | None | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)