MK
Mary Knapp — 1940 US Census Record
Model Tree available1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this Mary Knapp across the 1920, 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed), with identified parents Arthur — first a daughter (b.~1893), then head of a 2-person household.
Age 47
b. ~1893
Female
Daughter
Born: New York
Divorced
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Knapp |
| Given Name | Mary, E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Divorced |
| Birthplace | New York |
| 1935 Residence (City) | Grosse Pointe Park Village |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Occupation | Housework |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 0 |
| Income (1939) | 600 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Housework |
| Township / Ward | Grosse Pointe Park Village |
| Est. Birth Year | ~1893 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Knapp | Daughter | — | 47 | ~1893 |
| Arthur Murray | Head | — | 67 | ~1873 |
Census Appearances
1920
Wayne, Michigan
Spouse, age 28
Wayne, Michigan · implied b. ~1892 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knappe |
| Given Name | Mary E. |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | New York |
| Father's Birthplace | Ohio |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Wayne, Michigan
Spouse, age 39
Wayne, Michigan · implied b. ~1891 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | New York |
| Age at First Marriage | 23 |
| Father's Birthplace | New York |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Wayne-County, Michigan
Daughter, age 47
Wayne-County, Michigan · implied b. ~1893 — 2 household members
| Surname | Knapp |
| Given Name | Mary, E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Divorced |
| Birthplace | New York |
| 1935 Residence (City) | Grosse Pointe Park Village |
| 1935 Residence (County) | Wayne |
| Occupation | Housework |
| Industry | Private Home |
| Class of Worker | PW |
| Hours Worked | 0 |
| Income (1939) | 600 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| 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 Knapp across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Arthur Murray (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Arthur Murray
b. ~1873
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Knapp
Daughter · 1940 · age 47 · b. ~1893 · Michigan
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01829-00268)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Donald, G. Booth | 17 | Son | — | Michigan |
| 2 | Francis, F. Van Antwerp | 52 | Head | Clergyman | Michigan |
| 3 | Charles, W. Heath | 59 | Priest | Clergyman | Michigan |
| 4 | Martin, A. Gallagher | 46 | Priest | Clergyman | Ohio |
| 5 | Thomas, J. Collins | 30 | Priest | Clergyman | Michigan |
| 6 | Anna Schenk | 36 | Servant | Housekeeper | Hungary |
| 7 | Harvey, H. Steinbrecher | 40 | Head | Engineer | Michigan |
| 8 | Evelyn, M. Steinbrecher | 34 | Wife | — | Michigan |
| 9 | Ralph, K. Tasker | 35 | Head | 48 | Michigan |
| 10 | Dorothy, J. Tasker | 34 | Wife | 0 | Michigan |
| 11 | Mary, L. Carpenter | 32 | Sister-in-law | 42 | Michigan |
| 12 | Frederick, S. Ell | 45 | Head | 44 | Pennsylvania |
| 13 | Edith, C. Ell | 44 | Wife | 0 | Michigan |
| 14 | Dewey, O. Walters | 42 | Head | 40 | Missouri |
| 15 | June, E. Walters | 12 | Daughter | 0 | Michigan |
| 16 | Sibyl, B. Krakauer | 55 | Mrs. Housekeeper | 60 | Michigan |
| 17 | Herbert, F. Brown | 54 | Head | Cost Clerk | Nebraska |
| 18 | Mary, M. Brown | 47 | Wife | — | Kansas |
| 19 | Lucille, B. Brown | 27 | Daughter | File Clerk | Iowa |
| 20 | Francis, E. Brown | 23 | Son | Assembly Worker | Michigan |
| 21 | Arthur, J. Murray | 67 | Head | Accountant | Ohio |
| 22 | Mary, E. Knapp THIS PERSON | 47 | Daughter | Housework | New York |
| 23 | Frank, G. Vanstone | 42 | Head | Owner | Canada-English |
| 24 | Mary, E. Vanstone | 41 | Wife | — | Canada-English |
| 25 | Jack, G. Vanstone | 21 | Son | Pattern Maker | Michigan |
| 26 | Caroline, Mrs. Weir | 75 | Mother-in-law | — | Germany |
| 27 | Stella Russland | 40 | Head | Comptometer Operator | Indiana |
| 28 | Robert Russland | 13 | Son | — | Michigan |
| 29 | Thomas Russland | 11 | Son | — | Michigan |
| 30 | Ruth Mc Brown | 29 | Sister | Comptometer Operator | Michigan |
| 31 | Florence, A. La Bodna | 31 | Lodger | Comptometer Operator | Michigan |
| 32 | Harold, C. Worrell | 38 | Head | Grinder | Tennessee |
| 33 | Helen, N. Worrell | 40 | Wife | — | Michigan |
| 34 | Mary, K. Worrell | 6 | Daughter | — | Michigan |
| 35 | Clarence, C. Woodward | 65 | Head | Inspection Clerk | Michigan |
| 36 | Tessie, H. Woodward | 48 | Wife | Book-Keeper | Michigan |
| 37 | Sydney Hunt | 30 | Head | Commercial Writer | Wales-England |
| 38 | Eleanor Hunt | 23 | Wife | Student And Teacher | Ohio |
| 39 | William, W. Bryan | 27 | Head | Salesman | Louisiana |
| 40 | Adelaide, G. Bryan | 24 | Wife | Saleslady | Ohio |
Pedigree Summary
Mary
Gen 1 · 1 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)