MK
Mary Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Somerset-County, Pennsylvania
Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in Somerset-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1923), then head of a 9-person household.
Age 17
b. ~1923
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Somerset-County, Pennsylvania |
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Benson Boro |
| 1935 Residence (County) | Somerset |
| Additional Details | |
| Occupation | Seamstress |
| Industry | Dress Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 100 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same House |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Seamstress |
| Township / Ward | Benson Boro |
| Est. Birth Year | ~1923 |
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 |
|---|---|---|---|---|
| Helen Knapp | Daughter | — | 12 | ~1928 |
| Anna Knapp | Spouse | — | 44 | ~1896 |
| Abbie Brown | Spouse | — | 65 | ~1875 |
| John Brown | Head | — | 76 | ~1864 |
| George Knapp | Son | — | 11 | ~1929 |
| Joseph Knapp | Son | — | 21 | ~1919 |
| Anna Knapp | Daughter | — | 20 | ~1920 |
| Mary Knapp | Daughter | — | 17 | ~1923 |
| Betty Knapp | Daughter | — | 14 | ~1926 |
Census Appearances
1930
Somerset, Pennsylvania
Daughter, age 8
Somerset, Pennsylvania · implied b. ~1922 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Czechoslovakia |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Somerset-County, Pennsylvania
Daughter, age 17
Somerset-County, Pennsylvania · implied b. ~1923 — 9 household members
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Benson Boro |
| 1935 Residence (County) | Somerset |
| Occupation | Seamstress |
| Industry | Dress Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 100 |
| Highest Grade | Hs 2 |
| 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 Mary Knapp across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Knapp
Daughter · 1940 · age 17 · b. ~1923 · Pennsylvania
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Sibling
George Knapp
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Knapp
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Knapp
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Knapp
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Knapp
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 — Somerset-County, Pennsylvania
Open full size
1940 US Federal Census — Somerset-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03609-00077)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Agnes Rogalla | 58 | Head | — | Poland |
| 42 | Stanley Rogalla | 20 | Son | Miner | Poland |
| 43 | Henry Lehman | 47 | Head | Laborer | Pennsylvania |
| 44 | Annie Lehman | 45 | Wife | — | Pennsylvania |
| 45 | Henry Lehman | 14 | Son | — | Pennsylvania |
| 46 | Sarah Lehman | 12 | Daughter | — | Pennsylvania |
| 47 | James W. Blough | 53 | Head | Laborer | Pennsylvania |
| 48 | Olive P. Blough | 52 | Wife | — | Pennsylvania |
| 49 | Jacob Rodabaugh | 78 | Father-in-law | — | Pennsylvania |
| 50 | John O. Brown | 76 | Head | Laborer | Pennsylvania |
| 51 | Abbie Brown | 65 | Wife | — | Pennsylvania |
| 52 | — | None | — | — | — |
| 53 | Anna Knapp | 44 | Wife | — | Czechoslovakia |
| 54 | Joseph Jr. Knapp | 21 | Son | Miner | Pennsylvania |
| 55 | Anna Knapp | 20 | Daughter | — | Pennsylvania |
| 56 | Mary Knapp THIS PERSON | 17 | Daughter | Seamstress | Pennsylvania |
| 57 | Betty Knapp | 14 | Daughter | — | Pennsylvania |
| 58 | Helen Knapp | 12 | Daughter | — | Pennsylvania |
| 59 | George Knapp | 11 | Son | — | Pennsylvania |
| 60 | Joseph Knapp | 47 | Head | Miner | Poland |
| 61 | Andrew Mcnally | 45 | Head | Asst Mine Foreman | Pennsylvania |
| 62 | Florence Mcnally | 41 | Wife | — | Pennsylvania |
| 63 | Jean Mcnally | 9 | Daughter | — | Pennsylvania |
| 64 | Rollo Warwick | 37 | Head | Miner | Maryland |
| 65 | Ethel Warwick | 36 | Wife | — | Maryland |
| 66 | Mildred Warwick | 16 | Daughter | — | West Virginia |
| 67 | Dorothy Warwick | 12 | Daughter | — | West Virginia |
| 68 | Louise Warwick | 8 | Daughter | — | Maryland |
| 69 | Josephine Daugherty | 71 | Head | Clerk | Pennsylvania |
| 70 | Anna Bashon | 66 | Head | — | Poland |
| 71 | Harold Fishel | 32 | Son-in-law | Trucker | Pennsylvania |
| 72 | Nell Fishel | 33 | Daughter | — | Pennsylvania |
| 73 | William J. Jones | 42 | Head | Miner | England |
| 74 | Martha Jones | 47 | Wife | — | Pennsylvania |
| 75 | Robert Jones | 15 | Son | — | Pennsylvania |
| 76 | William Jr. Jones | 13 | Son | — | Pennsylvania |
| 77 | Frederick Bailey | 46 | Head | Health Officer | Pennsylvania |
| 78 | Irene Bailey | 46 | Wife | — | Pennsylvania |
| 79 | Ella Jane Bailey | 15 | Daughter | — | Pennsylvania |
| 80 | Betty Mae Bailey | 17 | Daughter | — | 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)