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Margaret Mccormick — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Margaret Mccormick across the 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 11-person household.
Age 14
b. ~1926
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | McCormick |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Pittsburgh City |
| Est. Birth Year | ~1926 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Grant Mccormick | Head | — | 48 | ~1892 |
| Rose Mccormick | Daughter | — | 15 | ~1925 |
| Mary Mccormick | Daughter | — | 9 | ~1931 |
| Grace Mccormick | Daughter | — | 18 | ~1922 |
| Teresa Mccormick | Daughter | — | 11 | ~1929 |
| Anna Mccormick | Daughter | — | 16 | ~1924 |
| Catherine Mccormick | Daughter | — | 3 | ~1937 |
| Mary Mccormick | Spouse | — | 46 | ~1894 |
| Frank Mccormick | Son | — | 7 | ~1933 |
| Margaret Mccormick | Daughter | — | 14 | ~1926 |
| Helen Mccormick | Daughter | — | 12 | ~1928 |
Census Appearances
1930
Allegheny, Pennsylvania
Daughter, age 4
Allegheny, Pennsylvania · implied b. ~1926 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | North Ireland |
| Mother's Birthplace | North Ireland |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 14
Allegheny-County, Pennsylvania · implied b. ~1926 — 11 household members
| Surname | McCormick |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh City |
| 1935 Residence (County) | Allegheny |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 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 Margaret Mccormick across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Margaret Mccormick
Daughter · 1940 · age 14 · b. ~1926 · Pennsylvania
★ You are viewing this record
Sibling
Grace Mccormick
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Mccormick
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Mccormick
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Mccormick
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mccormick
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Mccormick
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Mccormick
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Teresa Mccormick
Sibling · 1940 · age 11
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-t0627-03671-00017)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Sarah Milling | 56 | Head | — | Scotland |
| 42 | Robert Milling | 26 | Son | Apprentice | Pennsylvania |
| 43 | John G. Koyle | 42 | Head | Electrician | Pennsylvania |
| 44 | Alice Koyle | 40 | Wife | — | Pennsylvania |
| 45 | Virginia Koyle | 18 | Daughter | — | Pennsylvania |
| 46 | John Koyle | 17 | Son | — | Pennsylvania |
| 47 | Elizabeth Koyle | 14 | Daughter | — | Pennsylvania |
| 48 | Kathleen Koyle | 12 | Daughter | — | Pennsylvania |
| 49 | Rosemarie Koyle | 7 | Daughter | — | Pennsylvania |
| 50 | Barbara Koyle | 3 | Daughter | — | Pennsylvania |
| 51 | — | None | — | — | — |
| 52 | Josephine Ledbetter | 43 | Head | — | Minnesota |
| 53 | Wallace Ledbetter | 19 | Son | Shipping Clerk | Minnesota |
| 54 | Lawrence Ledbetter | 17 | Son | — | Minnesota |
| 55 | Clyde Leider | 59 | Head | Railroad Man | Pennsylvania |
| 56 | Minnie Leider | 52 | Wife | — | Pennsylvania |
| 57 | Margaret Leider | 32 | Daughter | Presser | Pennsylvania |
| 58 | Clifford Leider | 30 | Son | Clerk | Pennsylvania |
| 59 | Ernest A. Jensen | 39 | Head | Brakeman | Tennessee |
| 60 | Sally H. Jensen | 34 | Wife | — | Tennessee |
| 61 | Valentine B. Hoelinger | 68 | Head | Painter | Pennsylvania |
| 62 | Margaret Hoelinger | 65 | Wife | — | Pennsylvania |
| 63 | Mary Blair | 74 | Head | — | Pennsylvania |
| 64 | Edward Blair | 49 | Son | Mail Carrier | Pennsylvania |
| 65 | Michael J. Link | 53 | Head | Carpenter | Pennsylvania |
| 66 | Nora M. Link | 53 | Wife | — | Pennsylvania |
| 67 | Ralph Hanley | 38 | Head | Fireman (Extra) | Pennsylvania |
| 68 | Lelana Hanley | 39 | Wife | — | Pennsylvania |
| 69 | Grant Mccormick | 48 | Head | Laborer | Ireland |
| 70 | Mary Mccormick | 46 | Wife | — | Ireland |
| 71 | Grace Mccormick | 18 | Daughter | — | Pennsylvania |
| 72 | Anna Mccormick | 16 | Daughter | — | Pennsylvania |
| 73 | Rose Mccormick | 15 | Daughter | — | Pennsylvania |
| 74 | Margaret Mccormick THIS PERSON | 14 | Daughter | — | Pennsylvania |
| 75 | Helen Mccormick | 12 | Daughter | — | Pennsylvania |
| 76 | Teresa Mccormick | 11 | Daughter | — | Pennsylvania |
| 77 | Mary Mccormick | 9 | Daughter | — | Pennsylvania |
| 78 | Frank Mccormick | 7 | Son | — | Pennsylvania |
| 79 | Catherine Mccormick | 3 | Daughter | — | Pennsylvania |
| 80 | Harry R. Johnson | 44 | Head | Fireman | 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)