MC
Margaret Cooper — 1940 US Census Record
Model Tree available1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Margaret Cooper across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Mary & St — first a daughter (b.~1914), then head of a 5-person household.
Age 26
b. ~1914
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Cooper |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1914 |
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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Margaret Cooper | Daughter | — | 26 | ~1914 |
| George Cooper | Son | — | 45 | ~1895 |
| Mary Cooper | Spouse | — | 72 | ~1868 |
| Ester Cooper | Daughter | — | 45 | ~1895 |
| St Cooper | Head | — | 73 | ~1867 |
Census Appearances
1920
Allegheny, Pennsylvania
Daughter, age 6
Allegheny, Pennsylvania · implied b. ~1914 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Margaret L. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Wales |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Allegheny, Pennsylvania
Daughter, age 16
Allegheny, Pennsylvania · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Margaret J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Wales |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 26
Allegheny-County, Pennsylvania · implied b. ~1914 — 5 household members
| Surname | Cooper |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| 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 Margaret Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Cooper (~0.92 confidence) and father St Cooper (~0.92 confidence) and mother Mary Cooper (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Cooper
b. ~1867
Source mother
● Household
· direct · ~0.92
Father
St Cooper
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Mary Cooper
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Cooper
Daughter · 1940 · age 26 · b. ~1914 · Pennsylvania
★ You are viewing this record
Sibling
George Cooper
Sibling · 1940 · age 45
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ester Cooper
Sibling · 1940 · age 45
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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03655-00944)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ethel Cornelius | 51 | Wife | Teacher | Pennsylvania |
| 2 | Martha Cornelius | 26 | Daughter | Teacher | Pennsylvania |
| 3 | Aleta Cornelius | 19 | Daughter | — | Pennsylvania |
| 4 | Joseph Ward | 53 | Head | Salesman | Pennsylvania |
| 5 | Elsie Ward | 52 | Wife | — | Pennsylvania |
| 6 | Jane Ward | 19 | Daughter | — | Pennsylvania |
| 7 | James Williamson | 65 | Head | Salesman | Pennsylvania |
| 8 | Vossie Williamson | 48 | Wife | — | New York |
| 9 | Anna Mccracken | 71 | Head | Official Docent | Pennsylvania |
| 10 | Mary J. Marshall | 75 | Sister | Retired | Pennsylvania |
| 11 | Bertha Mamback | 25 | Servant | Housework | Pennsylvania |
| 12 | St. Clair Cooper | 73 | Head | Retired | Pennsylvania |
| 13 | Mary Cooper | 72 | Wife | — | England |
| 14 | Ester Cooper | 45 | Daughter | Investigator | Pennsylvania |
| 15 | George Cooper | 45 | Son | Salesman | Pennsylvania |
| 16 | Margaret Cooper THIS PERSON | 26 | Daughter | — | Pennsylvania |
| 17 | Jeremiah Deasy | 58 | Head | Chief Of Detectives | Pennsylvania |
| 18 | Anna Deasy | 54 | Wife | — | Pennsylvania |
| 19 | Jeremiah Deasy | 27 | Son | Apprentice Printer | Pennsylvania |
| 20 | John C. Deasy | 17 | Son | — | Pennsylvania |
| 21 | Frank Da Parma | 63 | Head | Retired | Italy |
| 22 | Annie Da Parma | 59 | Wife | — | New York |
| 23 | Elnore Anderson | 28 | Boarder | Teacher | Ohio |
| 24 | Anthony Lally | 37 | Head | Assistant Manager | Pennsylvania |
| 25 | Irene Lally | 32 | Wife | — | Pennsylvania |
| 26 | Ann Laurene Lally | 6 | Daughter | — | Pennsylvania |
| 27 | Patrick Griffin | 36 | Head | Gardener | Irish Free State |
| 28 | Josephine Griffin | 32 | Wife | — | Irish Free State |
| 29 | Kevin M. Griffin | 12 | Son | — | Pennsylvania |
| 30 | Brian A. Griffin | 8 | Son | — | Pennsylvania |
| 31 | Eamon E. Griffin | 5 | Son | — | Pennsylvania |
| 32 | Grant Walters | 90 | Head | Clergyman | Pennsylvania |
| 33 | Marguerite Walters | 55 | Wife | — | Pennsylvania |
| 34 | Mary Louise Walters | 28 | Daughter | Music Teacher | Ohio |
| 35 | Edmund Barnard | 65 | Head | Real Estate Agent | New York |
| 36 | Evelyn Barnard | 56 | Wife | — | Pennsylvania |
| 37 | Martha Wolcott | 50 | Head | — | Pennsylvania |
| 38 | Christopher Wolcott | 27 | Son | Laborer | Pennsylvania |
| 39 | Thomas Mcconaughy | 64 | Head | Real Estate Clerk | Pennsylvania |
| 40 | Margaret Mcconaughy | 57 | Wife | — | Pennsylvania |
Pedigree Summary
Margaret + 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)