MK
Mary Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Marshall-County, West Virginia
Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in Marshall-County, West Virginia (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 5-person household.
Age 21
b. ~1919
Female
Daughter
Born: West Virginia
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marshall-County, West Virginia |
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | West Virginia |
| 1935 Residence (City) | Moundsville City |
| 1935 Residence (County) | Marshall |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Income (1939) | 200 |
| Highest Grade | C 2 |
| 1935 Residence | Same house |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
| Occupation | Teacher |
| Township / Ward | Moundsville City |
| Est. Birth Year | ~1919 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Knapp | Daughter | — | 21 | ~1919 |
| Villa Knapp | Daughter | — | 17 | ~1923 |
| Rena Knapp | Spouse | — | 46 | ~1894 |
| Ila Knapp | Daughter | — | 11 | ~1929 |
| Cecil Knapp | Head | — | 47 | ~1893 |
Census Appearances
1930
Marshall, West …
Daughter, age 11
Marshall, West Virginia · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | West Virginia |
| Father's Birthplace | West Virginia |
| Mother's Birthplace | West Virginia |
| Can Read/Write | Yes |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
1940
Marshall-County, West …
Daughter, age 21
Marshall-County, West Virginia · implied b. ~1919 — 5 household members
| Surname | Knapp |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | West Virginia |
| 1935 Residence (City) | Moundsville City |
| 1935 Residence (County) | Marshall |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Income (1939) | 200 |
| Highest Grade | C 2 |
| 1935 Residence | Same house |
| Birth State | West Virginia |
| Birth Country | United States |
| Birthplace (normalized) | west virginia |
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 21 · b. ~1919 · West Virginia
★ You are viewing this record
Sibling
Ila Knapp
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Villa Knapp
Sibling · 1940 · age 17
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 — Marshall-County, West Virginia
Open full size
1940 US Federal Census — Marshall-County, West Virginia
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-04426-00228)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Sara Jo Dorsey | 5 | daughter | — | — |
| 2 | Clara Schaub | 50 | mother-in-law | — | West Virginia |
| 3 | Freda Cook | 24 | roomer | Clerk | West Virginia |
| 4 | Ray Atkins | 40 | Head | Traveling Salesman | West Virginia |
| 5 | Pauline Atkins | 34 | wife | — | West Virginia |
| 6 | John Atkins | 10 | son | — | West Virginia |
| 7 | Cecil Knapp | 47 | Head | Teller | West Virginia |
| 8 | Rena Knapp | 46 | wife | — | West Virginia |
| 9 | Mary Knapp THIS PERSON | 21 | daughter | Teacher | West Virginia |
| 10 | Villa Knapp | 17 | daughter | — | West Virginia |
| 11 | Ila Knapp | 11 | daughter | — | West Virginia |
| 12 | Norman Greenan | 31 | Head | Order Clerk | West Virginia |
| 13 | Mable Greenan | 28 | wife | Carving | West Virginia |
| 14 | Norman Greenan | 11 | son | — | West Virginia |
| 15 | Ben Sepko | 34 | Head | Butcher | Delaware |
| 16 | Freda Sepko | 31 | wife | — | Pennsylvania |
| 17 | Betty Sepko | 10 | daughter | — | West Virginia |
| 18 | Fred Sepko | 8 | son | — | West Virginia |
| 19 | Louise Sepko | 5 | daughter | — | West Virginia |
| 20 | Ben Jr Sepko | 4 | son | — | West Virginia |
| 21 | Henry Castilow | 64 | Head | Laborer | West Virginia |
| 22 | Eva Castilow | 61 | wife | — | Ohio |
| 23 | Frank Castilow | 43 | son | — | West Virginia |
| 24 | Leona Castilow | 33 | daughter | Maid | West Virginia |
| 25 | Helen Castilow | 25 | daughter | Machine Opr | West Virginia |
| 26 | Welch Sherman | 51 | Head | Teacher | West Virginia |
| 27 | Elizabeth Sherman | 35 | wife | — | Pennsylvania |
| 28 | Mary Sherman | 8 | daughter | — | West Virginia |
| 29 | Lynn Hinegardner | 40 | Head | Presser | West Virginia |
| 30 | Virginia Hinegardner | 37 | wife | — | West Virginia |
| 31 | Jane Hinegardner | 11 | daughter | — | West Virginia |
| 32 | Laura Price | 60 | mother-in-law | — | West Virginia |
| 33 | Russell Ruckman | 39 | Head | Car Inspector | West Virginia |
| 34 | Mable Ruckman | 42 | wife | — | West Virginia |
| 35 | Leroy Ruckman | 17 | son | — | West Virginia |
| 36 | Roger Ruckman | 15 | son | — | West Virginia |
| 37 | Robert Ruckman | 13 | son | — | West Virginia |
| 38 | Billie Ruckman | 9 | son | — | West Virginia |
| 39 | Ezra Cochran | 34 | Head | Auditor | West Virginia |
| 40 | Alberta Cochran | 32 | wife | — | West Virginia |
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)