MP
Mary Pierce — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Chester-County, Pennsylvania
Our Model Tree links this Mary Pierce across the 1920, 1930 and 1940 US Censuses in Chester-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1894), then head of a 5-person household.
Age 46
b. ~1894
Female
Head
Born: Scotland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Chester-County, Pennsylvania |
| Surname | Pierce |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Coatesville City |
| 1935 Residence (County) | Chester |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Nursing |
| Industry | Private home |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 861 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
| Occupation | Nursing |
| Township / Ward | Coatesville City |
| Est. Birth Year | ~1894 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Phyllis Pierce | Daughter | — | 12 | ~1928 |
| Mary Pierce | Daughter | — | 17 | ~1923 |
| Mary Pierce | Head | — | 46 | ~1894 |
| Emma Townsley | Other | — | 25 | ~1915 |
| David Pierce | Son | — | 9 | ~1931 |
Census Appearances
1920
Chester, Pennsylvania
Spouse, age 26
Chester, Pennsylvania · implied b. ~1894 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Pierce |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Scotland |
| Year of Immigration | 1913 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Scotland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Year of Naturalization | 1915 |
| Birthplace (normalized) | scotland |
1930
Chester, Pennsylvania
Other, age 36
Chester, Pennsylvania · implied b. ~1894 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Pierce |
| Given Name | Mary |
| Relationship to Head | wife-H |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Scotland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1914 |
| Age at First Marriage | 21 |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
1940
Chester-County, Pennsylvania
Head, age 46
Chester-County, Pennsylvania · implied b. ~1894 — 5 household members
| Surname | Pierce |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Scotland |
| 1935 Residence (City) | Coatesville City |
| 1935 Residence (County) | Chester |
| Naturalization Status | Naturalized |
| Occupation | Nursing |
| Industry | Private home |
| Class of Worker | PW |
| Hours Worked | 50 |
| Income (1939) | 861 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth Country | Scotland |
| Birthplace (normalized) | scotland |
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.
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This person
Anchor record
Mary Pierce
Head · 1940 · age 46 · b. ~1894 · Pennsylvania
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Chester-County, Pennsylvania
Open full size
1940 US Federal Census — Chester-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03464-00344)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marie S. Connor | 45 | Wife | — | Pennsylvania |
| 2 | William J. Connor | 12 | Son | — | Pennsylvania |
| 3 | Charles J. Connor | 9 | Son | — | Pennsylvania |
| 4 | Earl M. Richardson | 32 | Head | Clerk | Pennsylvania |
| 5 | Elsie M. Richardson | 28 | Wife | — | Pennsylvania |
| 6 | Robert J. Richardson | 10 | Son | — | Pennsylvania |
| 7 | Lois M. Richardson | 7 | Daughter | — | Pennsylvania |
| 8 | Edward M. Heyman | 39 | Head | Chemist | Pennsylvania |
| 9 | Nora L. Heyman | 39 | Wife | — | Pennsylvania |
| 10 | Edward J. Heyman | 19 | Son | Clerk | Pennsylvania |
| 11 | Dorothy M. Heyman | 16 | Daughter | — | Pennsylvania |
| 12 | Mabel L. Heyman | 15 | Daughter | — | Pennsylvania |
| 13 | Vivian E. Heyman | 13 | Daughter | — | Pennsylvania |
| 14 | Betty J. Heyman | 12 | Daughter | — | Pennsylvania |
| 15 | Francis W. Heyman | 10 | Son | — | Pennsylvania |
| 16 | Mary A. Heyman | 8 | Daughter | — | Pennsylvania |
| 17 | Kathleen J. Heyman | 6 | Daughter | — | Pennsylvania |
| 18 | Ruth F. Heyman | 4 | Daughter | — | Pennsylvania |
| 19 | Irma A. Heyman | 3 | Daughter | — | Pennsylvania |
| 20 | Herford H. Hoskins | 60 | Head | Crane Runner | Pennsylvania |
| 21 | Margaret S. Hoskins | 58 | Wife | Marker-In | Pennsylvania |
| 22 | Cassell S. Martin | 41 | Head | Operator | Pennsylvania |
| 23 | Phyllis L. Martin | 41 | Wife | — | Pennsylvania |
| 24 | Joyce L. Martin | 13 | Daughter | — | Pennsylvania |
| 25 | Phyllis J. Martin | 11 | Daughter | — | Pennsylvania |
| 26 | Richard C. Martin | 5 | Son | — | Pennsylvania |
| 27 | Timothy P. Mahoney | 66 | Head | Crane Runner | Pennsylvania |
| 28 | Gertrude V. Mahoney | 62 | Wife | — | Pennsylvania |
| 29 | Mary Pierce THIS PERSON | 46 | Head | Nursing | Scotland |
| 30 | Mary R. Pierce | 17 | Daughter | — | Pennsylvania |
| 31 | Phyllis A. Pierce | 12 | Daughter | — | Pennsylvania |
| 32 | David L. Pierce | 9 | Son | — | Pennsylvania |
| 33 | Emma Townsley | 25 | Roomer | Sewing | Pennsylvania |
| 34 | Austin J. Reynolds | 41 | Head | Bottler | Pennsylvania |
| 35 | Helen V. Reynolds | 36 | Wife | — | Pennsylvania |
| 36 | Lyman E. Tibbetts | 38 | Head | Assembler | New Hampshire |
| 37 | Caroline W. Tibbetts | 38 | Wife | — | New Jersey |
| 38 | Isabella J. Tibbetts | 14 | Daughter | — | Pennsylvania |
| 39 | Lyman E. Jr. Tibbetts | 9 | Son | — | Pennsylvania |
| 40 | Audrey S. Tibbetts | 3 | Daughter | — | Pennsylvania |
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)