MD
Mary Duncan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Dauphin-County, Pennsylvania
Our Model Tree links this Mary Duncan across the 1920, 1930 and 1940 US Censuses in Dauphin-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Arthur — first a spouse (b.~1893), then head of a 4-person household.
Age 47
b. ~1893
Female
Spouse
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dauphin-County, Pennsylvania |
| Surname | Duncan |
| Given Name | Mary H |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Dauphin |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Derry Township |
| Est. Birth Year | ~1893 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Marion Duncan | Daughter | — | 27 | ~1913 |
| Arthur Duncan | Head | — | 50 | ~1890 |
| Harry Duncan | Son | — | 23 | ~1917 |
| Mary Duncan | Spouse | — | 47 | ~1893 |
Census Appearances
1920
Dauphin, Pennsylvania
Daughter, age 27
Dauphin, Pennsylvania · implied b. ~1893 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary H |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Car Repairer |
| Industry | Steam Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Dauphin, Pennsylvania
Spouse, age 37
Dauphin, Pennsylvania · implied b. ~1893 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary H |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 20 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Dauphin-County, Pennsylvania
Spouse, age 47
Dauphin-County, Pennsylvania · implied b. ~1893 — 4 household members
| Surname | Duncan |
| Given Name | Mary H |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Dauphin |
| Highest Grade | No 8 |
| 1935 Residence | Pennsylvania |
| 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 (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Arthur Duncan (~0.60 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.6
Father
Arthur Duncan
b. ~1890
Source father
● Household
· direct · ~0.6
This person
Anchor record
Mary Duncan
Spouse · 1940 · age 47 · b. ~1893 · 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 — Dauphin-County, Pennsylvania
Open full size
1940 US Federal Census — Dauphin-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03480-00267)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Norman C Gipe | 19 | Son | Farmer | Pennsylvania |
| 2 | Catherine A Gipe | 21 | Daughter | — | Pennsylvania |
| 3 | Jennie M Marta | 41 | Housekeeper | Housekeeper | Pennsylvania |
| 4 | Harriet G Marta | 5 | Daughter | — | Pennsylvania |
| 5 | John P Shank | 53 | Head | Laborer | Pennsylvania |
| 6 | Reba G Shank | 25 | Daughter | Knock Out Room | Pennsylvania |
| 7 | Kenneth Shank | 22 | Son | Electrician | Pennsylvania |
| 8 | Beatrice D Shank | 18 | Daughter | — | Pennsylvania |
| 9 | Ray M Shank | 16 | Son | — | Pennsylvania |
| 10 | Ralph H Shank | 14 | Son | — | Pennsylvania |
| 11 | Glenn A Shank | 13 | Son | — | Pennsylvania |
| 12 | Samuel O Winters | 63 | Head | Farmer | Pennsylvania |
| 13 | Katie Winters | 65 | Wife | — | Pennsylvania |
| 14 | Jacob Albright | 27 | Head | Laborer | Pennsylvania |
| 15 | Louise Albright | 30 | Wife | Clerk | Pennsylvania |
| 16 | Marvin A Gipe | 25 | Head | Mechanic | Pennsylvania |
| 17 | Jennie O Gipe | 23 | Wife | — | Pennsylvania |
| 18 | Phyllis Gipe | 2 | Daughter | — | Pennsylvania |
| 19 | Jacob H Shank | 65 | Head | Farmer | Pennsylvania |
| 20 | Emma N Shank | 62 | Sister | — | Pennsylvania |
| 21 | Lizzie N Shank | 60 | Sister | — | Pennsylvania |
| 22 | William H Nye | 47 | Head | Laborer | Pennsylvania |
| 23 | Violet Nye | 40 | Wife | — | Pennsylvania |
| 24 | Evelyn M Nye | 6 | Daughter | — | Pennsylvania |
| 25 | Merle A Nye | 4 | Daughter | — | Pennsylvania |
| 26 | Harry C Howard | 57 | Head | Fireman | Pennsylvania |
| 27 | John Howard | 24 | Son | Chocolate Worker | Pennsylvania |
| 28 | Sara A Keiller | 67 | Housekeeper | Housekeeper | Pennsylvania |
| 29 | Harvey C Hellman | 36 | Head | Watchman | Pennsylvania |
| 30 | Ida M Hellman | 33 | Wife | — | Pennsylvania |
| 31 | Harvey C Jr Hellman | 12 | Son | — | Pennsylvania |
| 32 | Marie Hellman | 9 | Daughter | — | Pennsylvania |
| 33 | Alva M Hellman | 3 | Daughter | — | Pennsylvania |
| 34 | Ruth E Hellman | 2 | Daughter | — | Pennsylvania |
| 35 | Sara A Hellman | 0 | Daughter | — | Pennsylvania |
| 36 | Arthur C Duncan | 50 | Head | Janitor | Pennsylvania |
| 37 | Mary H Duncan THIS PERSON | 47 | Wife | — | Pennsylvania |
| 38 | Marion E Duncan | 27 | Daughter | Nurse | Pennsylvania |
| 39 | Harry A Duncan | 23 | Son | Printer | Pennsylvania |
| 40 | Ross A Weaver | 35 | Head | Chocolate Worker | Pennsylvania |
Pedigree Summary
Mary
Gen 1 · 1 parents
~0.6
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)