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Mary Mccormick — 1930 US Census Record
Model Tree available1930 United States Federal Census · St Clair, Michigan
Our Model Tree links this Mary Mccormick across the 1910, 1920 and 1930 US Censuses in St Clair, Michigan (XGBoost, ~Confirmed), with identified parents Cornelius & Mary — first a daughter (b.~1904), then head of a 5-person household.
Age 26
b. ~1904
Female
Daughter
Born: Michigan
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | St Clair, Michigan |
| Surname | McCormick |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Additional Details | |
| Occupation | Cashier |
| Industry | Bank |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Cashier |
| Township / Ward | St Clair City |
| Est. Birth Year | ~1904 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Mccormick | Daughter | — | 26 | ~1904 |
| Mable Parker | Daughter | — | 26 | ~1904 |
| John Mccormick | Head | — | 49 | ~1881 |
| Ellen Mccormick | Other | — | 48 | ~1882 |
| Clara Parker | Other | — | 48 | ~1882 |
Census Appearances
1910
St Clair, …
Daughter, age 4
St Clair, Michigan · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | none |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1920
St Clair, …
Daughter, age 14
St Clair, Michigan · implied b. ~1906 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCormick |
| Given Name | Mary K. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
St Clair, …
Daughter, age 26
St Clair, Michigan · implied b. ~1904 — 5 household members
| Surname | McCormick |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | Cashier |
| Industry | Bank |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Mccormick across 3 US Census years (1910, 1920 and 1930) in St Clair, Michigan, using XGBoost record linkage. Identified parents: father Cornelius Mccormick (~0.92 confidence) and mother Mary Mccormick (~0.92 confidence) and mother Mary Mccormick (~0.92 confidence) and father John Mccormick (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Cornelius Mccormick
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Mary Mccormick
b. ~1873
Source mother
● Household
· direct · ~0.92
Mother
Mary Mccormick
b. ~1874
Source mother
● Household
· direct · ~0.92
Father
John Mccormick
b. ~1881
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Mccormick
Daughter · 1930 · age 26 · b. ~1904 · Michigan
★ You are viewing this record
Sibling
Mable Parker
Sibling · 1930 · 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
1930 US Federal Census — St Clair, Michigan
Open full size
1930 US Federal Census — St Clair, Michigan
Page Contents
50 people indexed on this census page (ia:1930:michigancensus00reel1025:0780)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Lillian | 0 | Daughter | — | Michigan |
| 52 | Archibald R. Mitchell | 41 | Head | Barber | Canada-French |
| 53 | Viola Mitchell | 38 | Wife | — | Michigan |
| 54 | Viola M. Mitchell | 18 | Daughter | — | Michigan |
| 55 | Ronald R. Mitchell | 17 | Son | — | Michigan |
| 56 | Archibald Jr. Mitchell | 13 | Son | — | Michigan |
| 57 | Donald R. Mitchell | 66 | Father | Machinist | Canada-French |
| 58 | Jess W. Smith | 32 | Brother-in-law | Musician | Missouri |
| 59 | Evans Smith | 26 | Sister-in-law | — | Michigan |
| 60 | Sallie Jean Smith | 7 | Niece | — | Michigan |
| 61 | Frances A. Laffrey | 22 | Niece | Teacher | Michigan |
| 62 | Melvin J. Visger | 31 | Head | Driver | Michigan |
| 63 | Lucille Visger | 28 | Wife-H | — | Michigan |
| 64 | John A. Visger | 3 | Son | — | Michigan |
| 65 | Marius Ketels | 25 | Head | Carpenter | Germany |
| 66 | Ina Ketels | 25 | Wife-H | — | Germany |
| 67 | Erica Ketels | 0 | Daughter | — | Michigan |
| 68 | John Ketels | 34 | Brother | Laborer | Germany |
| 69 | Walter Schneider | 23 | Brother-in-law | Laborer | Germany |
| 70 | William Schutt | 49 | Head | Janitor | Michigan |
| 71 | Ralph De Palma | 46 | Lodger | Auto Engineer | Italy |
| 72 | Edward Ironmaker | 55 | Head | Catholic Priest | Michigan |
| 73 | Catherine Solon | 32 | Housekeeper | Housekeeping | Canada-English |
| 74 | Henry Thos. Carew | 45 | Head | Laborer | Michigan |
| 75 | Clement Denomy | 32 | Head | Laborer | Canada-French |
| 76 | Josephine Denomy | 71 | Wife-H | Operator | Austria |
| 77 | Amelia Lavey | 22 | Step-daughter | General Office Work | Ohio |
| 78 | Justin Lavey | 19 | Step-son | — | Michigan |
| 79 | Ralph Lavey | 15 | Step-son | — | Michigan |
| 80 | Ruth Lavey | 9 | Step-daughter | — | Michigan |
| 81 | Phyllis Lavey | 7 | Step-daughter | — | Michigan |
| 82 | Jacqueline Denomy | 2 | Daughter | — | Michigan |
| 83 | Phyllis De Clair | 70 | Boarder | — | Michigan |
| 84 | Albert Bucks | 51 | Head | Assistant Super-Intendent | Michigan |
| 85 | Caroline Bucks | 52 | Wife-H | — | Michigan |
| 86 | Louis B. Pauly | 43 | Head | Pipe Fitter | Michigan |
| 87 | Christina Pauly | 57 | Wife-H | — | Michigan |
| 88 | Caroline Vogt | 59 | Sister-in-law | — | Michigan |
| 89 | Maude Rankin | 51 | Head-H | — | Michigan |
| 90 | Harold Rankin | 29 | Son | Teacher | Michigan |
| 91 | John Rankin | 18 | Son | Clerical | Michigan |
| 92 | Ellis Lamidge | 28 | Son-in-law | Marine Engineer | Michigan |
| 93 | Beatrice Lamidge | 24 | Daughter | — | Michigan |
| 94 | Elizabeth A. Lamidge | 4 | Grand-daughter | — | Michigan |
| 95 | Patricia Lamidge | 2 | Grand-daughter | — | Michigan |
| 96 | John P. Mccormick | 49 | Head | Centrifugal Man | Michigan |
| 97 | Ellen A. Mccormick | 48 | Wife-H | — | Michigan |
| 98 | Mary E. Mccormick THIS PERSON | 26 | Daughter | Cashier | Michigan |
| 99 | Clara Parker | 48 | — | — | Iowa |
| 100 | Mable Parker | 26 | Daughter | Assistant Time Keeper | Michigan |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)