MD
Mary Duncan — 1930 US Census Record
Model Tree available1930 United States Federal Census · Perry, Pennsylvania
Our Model Tree links this Mary Duncan across the 1910, 1920 and 1930 US Censuses in Perry, Pennsylvania (XGBoost, ~Confirmed), with identified parents Patrick & Ida — first a daughter (b.~1905), then head of a 5-person household.
Age 25
b. ~1905
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Perry, Pennsylvania |
| Surname | Duncan |
| Given Name | Mary S |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Duncannon Borough |
| Est. Birth Year | ~1905 |
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.
5 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Jean Duncan | Daughter | — | 35 | ~1895 |
| Mary Duncan | Daughter | — | 25 | ~1905 |
| Edwin Duncan | Head | — | 61 | ~1869 |
| R Stone | Other | — | 19 | ~1911 |
| Ida Duncan | Spouse | — | 57 | ~1873 |
Census Appearances
1910
Perry, Pennsylvania
Daughter, age 6
Perry, Pennsylvania · implied b. ~1904 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary D. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Perry, Pennsylvania
Daughter, age 16
Perry, Pennsylvania · implied b. ~1904 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Duncan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Perry, Pennsylvania
Daughter, age 25
Perry, Pennsylvania · implied b. ~1905 — 5 household members
| Surname | Duncan |
| Given Name | Mary S |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| 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 Perry, Pennsylvania, using XGBoost record linkage. Identified parents: father Patrick Duncan (~0.92 confidence) and mother Ida Duncan (~0.92 confidence) and mother Mary Duncan (~0.92 confidence) and father Edwin Duncan (~0.92 confidence) and mother Ida Duncan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Patrick Duncan
b. ~1860
Source father
● Household
· direct · ~0.92
Mother
Ida Duncan
b. ~1863
Source mother
● Household
· direct · ~0.92
Mother
Mary Duncan
b. ~1863
Source mother
● Household
· direct · ~0.92
Father
Edwin Duncan
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Ida Duncan
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Duncan
Daughter · 1930 · age 25 · b. ~1905 · Pennsylvania
★ You are viewing this record
Sibling
Jean Duncan
Sibling · 1930 · age 35
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
1930 US Federal Census — Perry, Pennsylvania
Open full size
1930 US Federal Census — Perry, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2089:0184)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Vivian B Bigler | 11 | Daughter | — | Pennsylvania |
| 2 | Arthur B Bigler | 8 | Son | — | Pennsylvania |
| 3 | Bernadette M Bigler | 6 | Daughter | — | Pennsylvania |
| 4 | Phyllis J Bigler | 4 | Daughter | — | Pennsylvania |
| 5 | Anna M Wright | 60 | Head | House Work | Pennsylvania |
| 6 | Albert S Wright | 39 | Nephew | Chauffeur | Pennsylvania |
| 7 | Samuel C Zeigler | 57 | Head | Merchant | Pennsylvania |
| 8 | Margaret S Zeigler | 53 | Wife | — | Pennsylvania |
| 9 | Charles M Zeigler | 21 | Son | — | Pennsylvania |
| 10 | Ella M Sterling | 66 | Head | — | Pennsylvania |
| 11 | Julia S Sterling | 58 | H | — | Pennsylvania |
| 12 | George E Troup | 33 | Head | Merchant | Pennsylvania |
| 13 | Sarah E Troup | 32 | Wife | — | Pennsylvania |
| 14 | George P Troup | 1 | Son | — | Pennsylvania |
| 15 | Robert L Troup | 0 | Son | — | Pennsylvania |
| 16 | William S Duncan | 43 | Head | — | Pennsylvania |
| 17 | Anna M Duncan | 38 | Wife | — | Pennsylvania |
| 18 | Guy W Vick | 33 | Head | Clerk | Pennsylvania |
| 19 | Mary E Vick | 31 | Wife | — | Pennsylvania |
| 20 | Alice L Vick | 11 | Daughter | — | Pennsylvania |
| 21 | Sylvester J Duncan | 49 | Head | — | Pennsylvania |
| 22 | Anna M Duncan | 47 | Wife | — | Pennsylvania |
| 23 | Benjamin S Duncan | 75 | Head | — | Pennsylvania |
| 24 | Alice H Duncan | 72 | Wife | — | Pennsylvania |
| 25 | Joseph C Vance | 72 | Head | — | Pennsylvania |
| 26 | William V Stephens | 55 | Head | — | Pennsylvania |
| 27 | Daisy V Stephens | 54 | Wife | — | Pennsylvania |
| 28 | Helen Stephens | 20 | Daughter | — | Pennsylvania |
| 29 | John G Stephens | 16 | Son | — | Pennsylvania |
| 30 | Frank S Stephens | 11 | Son | — | Pennsylvania |
| 31 | James Duncan | 50 | Head | — | Pennsylvania |
| 32 | Annie B Duncan | 48 | Wife | — | Pennsylvania |
| 33 | Edwin Duncan | 61 | Head | Merchant | Pennsylvania |
| 34 | Ida M Duncan | 57 | Wife | — | Pennsylvania |
| 35 | Jean V Duncan | 35 | Daughter | — | Pennsylvania |
| 36 | Mary S Duncan THIS PERSON | 25 | Daughter | — | Pennsylvania |
| 37 | R. H. Stone | 19 | Lodger | Clerk | Pennsylvania |
| 38 | Mary M Tressler | 53 | Head | — | Pennsylvania |
| 39 | Charles L Tressler | 23 | Son | Assistant Postmaster | Pennsylvania |
| 40 | Mary E Smith | 78 | Servant | — | Pennsylvania |
| 41 | Mark Price | 73 | Head | Operator | Pennsylvania |
| 42 | Pattie Price | 71 | Wife | — | Pennsylvania |
| 43 | Vivian Tressler | 21 | Daughter | — | Pennsylvania |
| 44 | George N Young | 36 | Head | Gen. Art. | Pennsylvania |
| 45 | Ruth Young | 33 | Wife | — | Pennsylvania |
| 46 | Anna M Young | 14 | Daughter | — | Pennsylvania |
| 47 | Frank W Tressler | 54 | Head | — | Pennsylvania |
| 48 | Luetta M Tressler | 52 | Wife | — | Pennsylvania |
| 49 | Agnes L Tressler | 18 | Daughter | — | Pennsylvania |
| 50 | Paul E Tressler | 14 | Son | — | Pennsylvania |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)