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Mary Blackwell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Blackwell across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1910), then head of a 9-person household.
Age 30
b. ~1910
Female
Spouse
Born: S. Carolina
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Blackwell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Ne |
| Age | 30 |
| Marital Status | Married |
| Birthplace | S. Carolina |
| 1935 Residence (City) | PHILADELPHIA |
| 1935 Residence (County) | PHILADELPHIA |
| Additional Details | |
| Occupation | Domestic |
| Industry | House hold |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birthplace (normalized) | s carolina |
| Occupation | Domestic |
| Township / Ward | Philadelphia |
| Est. Birth Year | ~1910 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Blackwell | Spouse | — | 30 | ~1910 |
| Leonard Blackwell | Son | — | 8 | ~1932 |
| Margereta Blackwell | Daughter | — | 1 | ~1939 |
| Charles Blackwell | Son | — | 19 | ~1921 |
| Monroe Blackwell | Son | — | 16 | ~1924 |
| Glenn Blackwell | Head | — | 44 | ~1896 |
| Wilbur Blackwell | Son | — | 21 | ~1919 |
| Dorothy Blackwell | Daughter | — | 14 | ~1926 |
| Edward Blackwell | Son | — | 4 | ~1936 |
Census Appearances
1930
Philadelphia, Pennsylvania
Spouse, age 22
Philadelphia, Pennsylvania · implied b. ~1908 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | Mamie |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Married |
| Birthplace | S. Carolina |
| Age at First Marriage | 18 |
| Father's Birthplace | S. Carolina |
| Mother's Birthplace | S. Carolina |
| Can Read/Write | Yes |
| Birthplace (normalized) | s carolina |
1940
Philadelphia-County, Pennsylvania
Spouse, age 30
Philadelphia-County, Pennsylvania · implied b. ~1910 — 9 household members
| Surname | Blackwell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | Ne |
| Age | 30 |
| Marital Status | Married |
| Birthplace | S. Carolina |
| 1935 Residence (City) | PHILADELPHIA |
| 1935 Residence (County) | PHILADELPHIA |
| Occupation | Domestic |
| Industry | House hold |
| Class of Worker | PW |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birthplace (normalized) | s carolina |
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 Blackwell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Blackwell
Spouse · 1940 · age 30 · b. ~1910 · 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 — Philadelphia-County, Pennsylvania
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1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03698-01043)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Phesie Massie | 44 | Head | Sorter | Virginia |
| 2 | Marine Watkins | 27 | Head | Domestic | Virginia |
| 3 | Louis Smith | 40 | Head | Laborer | Virginia |
| 4 | May Allen | 48 | Head | Domestic | Washington D.C. |
| 5 | Walter Allen | 18 | Son | New Worker | Pennsylvania |
| 6 | William Jones | 40 | Head | Laborer | Virginia |
| 7 | Mary Jones | 38 | Wife | Domestic | Virginia |
| 8 | Arthur Dukes | 38 | Head | Laborer | Arkansas |
| 9 | George Nixon | 59 | Head | Longshoreman | New Jersey |
| 10 | Myrtle Duncan | 21 | Niece | Domestic | Pennsylvania |
| 11 | Wilbert White | 30 | Head | Laborer | Georgia |
| 12 | Rea White | 57 | Mother | Domestic | Georgia |
| 13 | Andrew Stokes | 57 | Head | Laborer | Georgia |
| 14 | Brown Richard | 62 | Head | Laborer | Pennsylvania |
| 15 | Emma Carter | 60 | Head | Domestic | Georgia |
| 16 | Alberta Wright | 40 | Head | Stripper | Delaware |
| 17 | Rosetta Harris | 23 | Daughter | Stripper | Pennsylvania |
| 18 | James King | 4 | Grandson | — | Pennsylvania |
| 19 | Alberta King | 3 | Granddaughter | — | Pennsylvania |
| 20 | Rosetta King | 2 | Granddaughter | — | Pennsylvania |
| 21 | Glenn Blackwell | 44 | Head | Fireman | S. Carolina |
| 22 | Mary Blackwell THIS PERSON | 30 | Wife | Domestic | S. Carolina |
| 23 | Wilbur Blackwell | 21 | Son | New Worker | N. Carolina |
| 24 | Charles Blackwell | 19 | Son | New Worker | N. Carolina |
| 25 | Monroe Blackwell | 16 | Son | New Worker | N. Carolina |
| 26 | Dorothy Blackwell | 14 | Daughter | — | Pennsylvania |
| 27 | Leonard Blackwell | 8 | Son | — | Pennsylvania |
| 28 | Edward Blackwell | 4 | Son | — | Pennsylvania |
| 29 | Margereta Blackwell | 1 | Daughter | — | Pennsylvania |
| 30 | Sarah Dooley | 50 | Head | Domestic | Washington D.C. |
| 31 | Ellis Williams | 16 | Nephew | New Worker | Pennsylvania |
| 32 | Alfred Jones | 36 | Head | Laborer | Alabama |
| 33 | Bealah Jones | 36 | Wife | New Worker | Georgia |
| 34 | Mary Jones | 15 | Daughter | New Worker | Alabama |
| 35 | Ruth Jones | 13 | Daughter | — | Pennsylvania |
| 36 | Richard Jones | 11 | Son | — | Pennsylvania |
| 37 | William Pharr | 67 | Head | Paper Hanging | N. Carolina |
| 38 | Thomas Jefferson | 47 | Lodger | Laborer | Alabama |
| 39 | James Frierson | 23 | Head | Laborer | Mississippi |
| 40 | Hazel Frierson | 23 | Wife | House Hold | Mississippi |
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)