MW
Mary Williamson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Erie-County, New York
Our Model Tree links this Mary Williamson across the 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed) — first a daughter (b.~1918), then head of a 9-person household.
Age 22
b. ~1918
Female
Daughter
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | Williamson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Additional Details | |
| Occupation | Jr. Accountant |
| Industry | Insurance Agency |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 830 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Jr. Accountant |
| Township / Ward | Buffalo City |
| 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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Margaret Williamson | Daughter | — | 19 | ~1921 |
| Patricia Williamson | Daughter | — | 17 | ~1923 |
| Eunice Williamson | Daughter | — | 15 | ~1925 |
| Barbara Williamson | Daughter | — | 11 | ~1929 |
| Mary Williamson | Daughter | — | 22 | ~1918 |
| Andrew Williamson | Head | — | 50 | ~1890 |
| Andrew Williamson | Son | — | 9 | ~1931 |
| John Williamson | Son | — | 21 | ~1919 |
| Eunice Williamson | Spouse | — | 50 | ~1890 |
Census Appearances
1930
Erie, New …
Daughter, age 12
Erie, New York · implied b. ~1918 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williamson |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Erie-County, New …
Daughter, age 22
Erie-County, New York · implied b. ~1918 — 9 household members
| Surname | Williamson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Occupation | Jr. Accountant |
| Industry | Insurance Agency |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 830 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 Williamson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Williamson
Daughter · 1940 · age 22 · b. ~1918 · New York
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Sibling
Eunice Williamson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Williamson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Williamson
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Williamson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Williamson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Williamson
Sibling · 1940 · age 21
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 — Erie-County, New York
Open full size
1940 US Federal Census — Erie-County, New York
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-02824-00015)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marion L. Stock | 22 | Daughter | — | New Jersey |
| 2 | Nancy E. Stock | 20 | Daughter | — | New York |
| 3 | Carl Miller | 41 | Head | Auto Dealer | New York |
| 4 | Mildred Miller | 38 | Wife | — | New York |
| 5 | Carl Jr. Miller | 14 | Son | — | New York |
| 6 | Ann Lucius | 26 | Housekeeper | Housekeeper | New York |
| 7 | Michael Vool | 72 | Head | — | New York |
| 8 | Elizabeth Vool | 70 | Wife | — | New York |
| 9 | Genevieve Vool | 35 | Daughter | Stenographer | New York |
| 10 | Anthony Fersch | 48 | Son-in-law | — | New York |
| 11 | James J. O'Neill | 62 | Head | Clerk | Penna |
| 12 | Thomas J. O'Neill | 32 | Son | Musician | Penna |
| 13 | Thelma O'Neill | 31 | Daughter-in-law | — | New York |
| 14 | Paul O'Neill | 9 | Grandson | — | New York |
| 15 | James O'Neill | 8 | Grandson | — | New York |
| 16 | Timothy O'Neill | 5 | Grandson | — | New York |
| 17 | Maude Mcgeehan | 34 | Niece | School Teacher | Penna |
| 18 | George Sathson | 63 | Head | Plumber | New York |
| 19 | Madrick Sathson | 60 | Wife | — | Germany |
| 20 | Marie N. Sathson | 38 | Daughter | Visitor | New York |
| 21 | M. Celia Crane | 68 | Head | — | New York |
| 22 | Myra Crane | 47 | Daughter | — | New York |
| 26 | Andrew Williamson | 50 | Head | Civil Engineer | New York |
| 27 | Eunice Williamson | 50 | Wife | — | New York |
| 28 | Mary Williamson THIS PERSON | 22 | Daughter | Jr. Accountant | New York |
| 29 | John Williamson | 21 | Son | Special Delivery | New York |
| 30 | Margaret Williamson | 19 | Daughter | New Worker | New York |
| 31 | Patricia Williamson | 17 | Daughter | — | New York |
| 32 | Eunice Williamson | 15 | Daughter | — | New York |
| 33 | Barbara Williamson | 11 | Daughter | — | New York |
| 34 | Andrew Jr. Williamson | 9 | Son | — | New York |
| 35 | John F. Morton | 49 | Head | Engineer | New York |
| 36 | Selene Morton | 47 | Wife | — | New York |
| 37 | Mary V. Morton | 22 | Daughter | Secretary | New York |
| 38 | Edward J. Clark | 80 | Head | — | Penna |
| 39 | Edward J. Jr. Clark | 40 | Son | Clerk | New York |
| 40 | Marie R. Clark | 38 | Daughter | Telegraph Operator | New York |
Related Census Records
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)