MP
Mary Pierce — 1940 US Census Record
Model Tree available1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Pierce across the 1920, 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Clara & Clara — first a daughter (b.~1906), then head of a 6-person household.
Age 34
b. ~1906
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Pierce |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Occupation | Bookkeeper |
| Industry | Plumbing & Heating |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 750 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Bookkeeper |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1906 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Clara Pierce | Daughter | — | 37 | ~1903 |
| Mary Pierce | Daughter | — | 34 | ~1906 |
| Edward Pierce | Head | — | 57 | ~1883 |
| Doris Pierce | Other | — | 31 | ~1909 |
| Edward Pierce | Son | — | 36 | ~1904 |
| Clara Pierce | Spouse | — | 58 | ~1882 |
Census Appearances
1920
Philadelphia, Pennsylvania
Daughter, age 14
Philadelphia, Pennsylvania · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peirce |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| 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
Philadelphia, Pennsylvania
Daughter, age 24
Philadelphia, Pennsylvania · implied b. ~1906 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peirce |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Bookkeeper |
| Industry | Plumbing Supply |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Philadelphia-County, Pennsylvania
Daughter, age 34
Philadelphia-County, Pennsylvania · implied b. ~1906 — 6 household members
| Surname | Pierce |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Philadelphia |
| 1935 Residence (County) | Philadelphia |
| Occupation | Bookkeeper |
| Industry | Plumbing & Heating |
| Class of Worker | PW |
| Hours Worked | 32 |
| Income (1939) | 750 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| 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 Pierce across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Clara Pierce (~0.92 confidence) and mother Clara Peirce (~0.92 confidence) and father Edward Peirce (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Clara Pierce
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Clara Peirce
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
Edward Peirce
b. ~1883
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Pierce
Daughter · 1940 · age 34 · b. ~1906 · Pennsylvania
★ You are viewing this record
Sibling
Edward Pierce
Sibling · 1940 · age 36
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clara Pierce
Sibling · 1940 · age 37
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
1940 US Federal Census — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03701-00333)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Horace P. Goodwin | 54 | Head | Merchant | Pennsylvania |
| 2 | Elizabeth Goodwin | 48 | Wife | — | New York |
| 3 | Horace Jr. Goodwin | 17 | Son | — | Pennsylvania |
| 4 | Callen Stewart | 78 | Mother-in-law | — | Vermont |
| 5 | Edward H. Pierce | 57 | Head | Plumber | Pennsylvania |
| 6 | Clara E. Pierce | 58 | Wife | — | Pennsylvania |
| 7 | Clara M. Pierce | 37 | Daughter | Bookkeeper | Pennsylvania |
| 8 | Edward M. Pierce | 36 | Son | Salesman | Pennsylvania |
| 9 | Doris A. Pierce | 31 | Daughter-in-law | — | Massachusetts |
| 10 | Mary C. Pierce THIS PERSON | 34 | Daughter | Bookkeeper | Pennsylvania |
| 11 | John P. Dougherty | 70 | Head | Contractor | Pennsylvania |
| 12 | Anna Dougherty | 55 | Wife | — | Pennsylvania |
| 13 | John J. Dougherty | 33 | Son | Lineman | Pennsylvania |
| 14 | George J. Dougherty | 31 | Son | Clerk | Pennsylvania |
| 15 | Anna Delaunay | 65 | Head | — | Pennsylvania |
| 16 | Amil K. Delaunay | 37 | Daughter | Secretary | Pennsylvania |
| 17 | Amea M. Delaunay | 34 | Daughter | Solicitor | Pennsylvania |
| 18 | Helen J. Delaunay | 32 | Daughter | Secretary | Pennsylvania |
| 19 | Mary C. Delaunay | 29 | Daughter | Secretary | Pennsylvania |
| 20 | Vincent Delaunay | 27 | Son | Clerk | Pennsylvania |
| 21 | Camille Delaunay | 22 | Daughter-in-law | — | Pennsylvania |
| 22 | Elizabeth B. Delaunay | 3 | Granddaughter | — | Pennsylvania |
| 23 | Margaret Keenan | 69 | Head | — | Ireland |
| 24 | Annie M. Keenan | 32 | Daughter | Clerk | Pennsylvania |
| 25 | Grace V. Shuman | 28 | Lodger | Stenographer | Pennsylvania |
| 26 | John Cushing | 27 | Head | Sleeper | Pennsylvania |
| 27 | Mary Cushing | 23 | Sister | Saleslady | Pennsylvania |
| 28 | Joseph Cushing | 20 | Brother | Apprentice | Pennsylvania |
| 29 | Elizabeth Daly | 74 | Head | Occupational Therapist | Pennsylvania |
| 30 | Walter S. Jackson | 41 | Head | Clerk | Pennsylvania |
| 31 | Regina A. Jackson | 42 | Wife | — | Pennsylvania |
| 32 | Edward Jackson | 18 | Son | — | Pennsylvania |
| 33 | Helen Jackson | 16 | Daughter | — | Pennsylvania |
| 34 | Walter Jr. Jackson | 14 | Son | — | Pennsylvania |
| 35 | Robert Jackson | 3 | Son | — | Pennsylvania |
| 36 | Elizabeth Malone | 89 | Aunt | — | Pennsylvania |
| 37 | George Krieg | 53 | Head | Clerk | Pennsylvania |
| 38 | Lucy Krieg | 51 | Wife | — | Louisiana |
| 39 | Florence R. Krieg | 21 | Daughter | Technician Med. | Nevada |
| 40 | Edward B. Farrell | 52 | Head | Mail Carrier | Pennsylvania |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 3 parents
~0.92
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)