MC
Mary Cox — 1940 US Census Record
Model Tree available1940 United States Federal Census · Delaware-County, Pennsylvania
Our Model Tree links this Mary Cox across the 1920, 1930 and 1940 US Censuses in Delaware-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Howard & Alice — first a daughter (b.~1918), then head of a 14-person household.
Age 22
b. ~1918
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Pennsylvania |
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | LANSDOWNE Borough |
| 1935 Residence (County) | DELAWARE |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Lansdowne Borough |
| Est. Birth Year | ~1918 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Anne Cox | Daughter | — | 20 | ~1920 |
| Mary Cox | Daughter | — | 22 | ~1918 |
| Nora Cox | Daughter | — | 27 | ~1913 |
| Alice Cox | Daughter | — | 29 | ~1911 |
| Loretta Cox | Daughter | — | 9 | ~1931 |
| Howard Cox | Head | — | 54 | ~1886 |
| Frank Owens | Other | — | 21 | ~1919 |
| Dorothy Owens | Other | — | 19 | ~1921 |
| Alice Owens | Other | — | 17 | ~1923 |
| Chas Owens | Other | — | 25 | ~1915 |
| William Cox | Son | — | 11 | ~1929 |
| James Cox | Son | — | 23 | ~1917 |
| Howard Cox | Son | — | 26 | ~1914 |
| Alice Cox | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Chester, Pennsylvania
Other, age
Chester, Pennsylvania · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Marie E. |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Delaware, Pennsylvania
Daughter, age 11
Delaware, Pennsylvania · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cox |
| Given Name | Marie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Delaware-County, Pennsylvania
Daughter, age 22
Delaware-County, Pennsylvania · implied b. ~1918 — 14 household members
| Surname | Cox |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | LANSDOWNE Borough |
| 1935 Residence (County) | DELAWARE |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same House |
| 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 Cox across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father Howard Cox (~0.92 confidence) and mother Alice Cox (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Howard Cox
b. ~1886
Source father
● Household
· direct · ~0.92
Mother
Alice Cox
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Cox
Daughter · 1940 · age 22 · b. ~1918 · Pennsylvania
★ You are viewing this record
Sibling
James Cox
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nora Cox
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anne Cox
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Loretta Cox
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Cox
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Cox
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Howard Cox
Sibling · 1940 · age 26
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-t0627-03493-00243)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Calvin H. Rankin | 39 | Head | Lawyer | Minnesota |
| 2 | Pauline Rankin | 39 | Wife | — | Pennsylvania |
| 3 | Calvin Jr. Rankin | 15 | Son | — | Pennsylvania |
| 4 | Edward Landenberger | 66 | Father-in-law | — | Pennsylvania |
| 5 | Lucille Scales | 23 | Housemaid | Housemaid | Virginia |
| 6 | E. B. Hunt | 71 | Head | — | New Jersey |
| 7 | Sarah J. Hunt | 67 | Wife | — | New Jersey |
| 8 | Grace E. Neall | 72 | Head | — | Canada |
| 9 | Howard J. Cox | 54 | Head | Salesman | Pennsylvania |
| 10 | Alice Cox | 48 | Wife | — | Pennsylvania |
| 11 | Alice Cox | 29 | Daughter | Operator | Pennsylvania |
| 12 | Nora Cox | 27 | Daughter | Clerk | Pennsylvania |
| 13 | Howard Jr. Cox | 26 | Son | Welder | Pennsylvania |
| 14 | James Cox | 23 | Son | Stock Boy | Pennsylvania |
| 15 | Mary Cox THIS PERSON | 22 | Daughter | — | Pennsylvania |
| 16 | Anne Cox | 20 | Daughter | Waitress | Pennsylvania |
| 17 | William Cox | 11 | Son | — | Pennsylvania |
| 18 | Loretta Cox | 9 | Daughter | — | Pennsylvania |
| 19 | Chas Owens | 25 | Step-son | Salesman | Pennsylvania |
| 20 | Frank Owens | 21 | Step-son | Trucker | Pennsylvania |
| 21 | Dorothy Owens | 19 | Step-daughter | Wrapper | Pennsylvania |
| 22 | Alice Marie Owens | 17 | Step-daughter | — | Pennsylvania |
| 23 | Joseph A. Mccloskey | 51 | Head | Manager | Pennsylvania |
| 24 | Elizabeth B. Mccloskey | 43 | Wife | — | Pennsylvania |
| 25 | Katharine Mccloskey | 11 | Daughter | — | Pennsylvania |
| 26 | Constance Mccloskey | 8 | Daughter | — | Pennsylvania |
| 27 | John B. Davis | 62 | Head | Research | Massachusetts |
| 28 | Ruth C. Davis | 60 | Wife | — | Massachusetts |
| 29 | Margaret Davis | 29 | Daughter | Secretary | New Hampshire |
| 30 | Blake H. Beatty | 60 | Head | Lumber | Pennsylvania |
| 31 | Bertha E. Beatty | 56 | Wife | — | Pennsylvania |
| 32 | Blake H. Jr. Beatty | 24 | Son | Bookkeeper | Pennsylvania |
| 33 | J. H. Brown | 66 | Head | Dentist | North Carolina |
| 34 | Nellie S. P. Brown | 64 | Wife | — | Maryland |
| 35 | Edward H. Brown | 30 | Son | Shipping Dept | Pennsylvania |
| 36 | Emilie P. Brown | 28 | Daughter | Secretary | Pennsylvania |
| 37 | Charles E. Brown | 69 | Brother | Salesman | North Carolina |
| 38 | William D. Lewis | 70 | Head | Editor | New York |
| 39 | Louise G. Lewis | 71 | Wife | — | New York |
| 40 | Jessie Louise Lewis | 44 | Daughter | — | New York |
Related Census Records
Pedigree Summary
Mary + 7 siblings
Gen 1 · 2 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)