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Mary Baldwin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Delaware-County, Pennsylvania
Our Model Tree links this Mary Baldwin across the 1920, 1930 and 1940 US Censuses in Delaware-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Harry & William — first a daughter (b.~1916), then head of a 7-person household.
Age 24
b. ~1916
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Pennsylvania |
| Surname | Baldwin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Media borough |
| 1935 Residence (County) | Delaware |
| Additional Details | |
| Occupation | Clerk |
| Industry | Sun Oil Co |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 728 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Clerk |
| Township / Ward | Media Borough |
| Est. Birth Year | ~1916 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Baldwin | Daughter | — | 24 | ~1916 |
| Eliz Baldwin | Daughter | — | 23 | ~1917 |
| Harry Baldwin | Head | — | 65 | ~1875 |
| Charles Baldwin | Son | — | 27 | ~1913 |
| Helen Baldwin | Son | — | 34 | ~1906 |
| James Baldwin | Son | — | 35 | ~1905 |
| Frank Baldwin | Son | — | 36 | ~1904 |
Census Appearances
1920
Delaware, Pennsylvania
Daughter, age 4
Delaware, Pennsylvania · implied b. ~1916 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Baldwin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Ireland |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Delaware, Pennsylvania
Daughter, age 14
Delaware, Pennsylvania · implied b. ~1916 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Baldwin |
| 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 | Ireland |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Delaware-County, Pennsylvania
Daughter, age 24
Delaware-County, Pennsylvania · implied b. ~1916 — 7 household members
| Surname | Baldwin |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Media borough |
| 1935 Residence (County) | Delaware |
| Occupation | Clerk |
| Industry | Sun Oil Co |
| Class of Worker | PW |
| Hours Worked | 54 |
| Income (1939) | 728 |
| Highest Grade | H-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 Baldwin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Harry Baldwin (~0.92 confidence) and father William Baldwin (~0.92 confidence) and mother Annie Baldwin (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harry Baldwin
b. ~1875
Source father
● Household
· direct · ~0.92
Father
William Baldwin
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Annie Baldwin
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Baldwin
Daughter · 1940 · age 24 · b. ~1916 · Pennsylvania
★ You are viewing this record
Sibling
Helen Baldwin
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eliz Baldwin
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Baldwin
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Baldwin
Sibling · 1940 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Baldwin
Sibling · 1940 · age 36
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 — Delaware-County, Pennsylvania
Open full size
1940 US Federal Census — Delaware-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03493-00586)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Alma V. Marshall | 21 | Daughter | Stenographer | Pennsylvania |
| 2 | Phyllis Marshall | 15 | Daughter | — | Pennsylvania |
| 3 | Wm. B. Jr. Marshall | 12 | Son | — | Pennsylvania |
| 4 | Helen M. Wood | 37 | Head | Teacher | Pennsylvania |
| 5 | Eliz. M. Mcdowell | 63 | Aunt | Teacher | Pennsylvania |
| 6 | Harry C. Baldwin | 65 | Head | — | Pennsylvania |
| 7 | Frank Baldwin | 36 | Son | Plumber | Pennsylvania |
| 8 | James Baldwin | 35 | Son | Installing Mach | Pennsylvania |
| 9 | Helen Baldwin | 34 | Son | Plasterer | Pennsylvania |
| 10 | Charles Baldwin | 27 | Son | Casing Packer | Pennsylvania |
| 11 | Mary Baldwin THIS PERSON | 24 | Daughter | Clerk | Pennsylvania |
| 12 | Eliz. Baldwin | 23 | Daughter | Waitress | Pennsylvania |
| 13 | Joseph Reichelt | 49 | Head | Blacksmith | Germany |
| 14 | Catherine Reichelt | 45 | Wife | — | Maryland |
| 15 | Herbert Reichelt | 21 | Son | Clerk - Record | Delaware |
| 16 | Eleanor Reichelt | 19 | Daughter | — | Delaware |
| 17 | Hanna Reichelt | 17 | Daughter | — | Maryland |
| 18 | Paul Reichelt | 14 | Son | — | Pennsylvania |
| 19 | Harry W. Riffendifer | 56 | Head | Fireman | Pennsylvania |
| 20 | Sarah Riffendifer | 60 | Wife | — | Pennsylvania |
| 21 | Wm. C. Taylor | 70 | Lodger | Foreman | Pennsylvania |
| 22 | James V. Conway | 54 | Head | Material Checker | Pennsylvania |
| 23 | Alice Conway | 51 | Wife | — | Maryland |
| 24 | Vincent Conway | 21 | Son | Machinist | Pennsylvania |
| 25 | Eugene Conway | 18 | Son | — | Pennsylvania |
| 26 | Eileen Conway | 11 | Daughter | — | Pennsylvania |
| 27 | George F. Dyce | 60 | Head | Carpenter | Pennsylvania |
| 28 | Bessie F. Dyce | 57 | Wife | — | Pennsylvania |
| 29 | Thomas T. Holmes | 40 | Head | Pipe Fitter | England |
| 30 | Florence Holmes | 35 | Wife | — | Pennsylvania |
| 31 | Alice Holmes | 16 | Daughter | — | Pennsylvania |
| 32 | Robt. Gaylord | 3 | Head | Painter | Pennsylvania |
| 33 | Margaret Gaylord | 63 | Wife | — | Pennsylvania |
| 34 | Sarah Ridcock | 84 | Mother-in-law | — | Pennsylvania |
| 35 | F. Guy Tuckey | 50 | Head | Secretary | Pennsylvania |
| 36 | Ida S. Davies | 69 | Housekeeper | House Keeper | Pennsylvania |
| 37 | Isaac Yarnall | 71 | Head | Real Estate | Pennsylvania |
| 38 | Eliz. Yarnall | 72 | Wife | — | Pennsylvania |
| 39 | Henry C. Mccarty | 36 | Head | Painter | Pennsylvania |
| 40 | Freda Mccarty | 30 | Daughter | — | Pennsylvania |
Pedigree Summary
Mary + 5 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)