MK
Mary Knapp — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hill-County, Montana
Our Model Tree links this Mary Knapp across the 1930 and 1940 US Censuses in Hill-County, Montana (XGBoost, ~Confirmed) — first a spouse (b.~1907), then head of a 8-person household.
Age 33
b. ~1907
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hill-County, Montana |
| Surname | Knapp |
| Given Name | Mary O. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Fort Peck Valley |
| Additional Details | |
| Industry | 0 |
| Highest Grade | 7 |
| 1935 Residence | Montana |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Havre City |
| Est. Birth Year | ~1907 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Theodora Knapp | Daughter | — | 5 | ~1935 |
| Narlene Knapp | Daughter | — | 10 | ~1930 |
| Neva Knapp | Other | — | 56 | ~1884 |
| Rita Knapp | Daughter | — | 11 | ~1929 |
| Mary Knapp | Spouse | — | 33 | ~1907 |
| Glenn Knapp | Head | — | 40 | ~1900 |
| Virginia Knapp | Daughter | — | 13 | ~1927 |
| Patricia Knapp | Daughter | — | 2 | ~1938 |
Census Appearances
1930
Hill, Montana
Other, age 23
Hill, Montana · implied b. ~1907 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Knapp |
| Given Name | Mary O. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 17 |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Hill-County, Montana
Spouse, age 33
Hill-County, Montana · implied b. ~1907 — 8 household members
| Surname | Knapp |
| Given Name | Mary O. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Fort Peck Valley |
| Industry | 0 |
| Highest Grade | 7 |
| 1935 Residence | Montana |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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
Spouse · 1940 · age 33 · b. ~1907 · Montana
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Hill-County, Montana
Open full size
1940 US Federal Census — Hill-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02221-00487)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Grace Rand | 19 | Son | Stock Boy | Canada-English |
| 2 | Millard Rand | 17 | Son | Pin Setter | Montana |
| 3 | Sigurd Rand | 14 | Son | — | Montana |
| 4 | Christine O. Kamp | 45 | Head | — | North Dakota |
| 5 | William A. Kamp | 22 | Son | Truck Driver | Montana |
| 6 | Theodore Kamp | 18 | Son | Night Watchman | Montana |
| 7 | Benjamin Kamp | 16 | Son | — | Montana |
| 8 | Morton F. B. Horton | 33 | Head | Farm Laborer | Missouri |
| 9 | Fred Q. Horton | 65 | Father | Road Laborer | Missouri |
| 10 | Mary M. Horton | 61 | Mother | — | Missouri |
| 11 | Charles Talkins | 53 | Head | Janitor | Kansas |
| 12 | Myra D. Talkins | 41 | Wife | — | Pennsylvania |
| 13 | Janice Talkins | 17 | Daughter | Dishwasher | Montana |
| 14 | Gloria Talkins | 15 | Daughter | — | Montana |
| 15 | Charlotte Talkins | 14 | Daughter | — | Montana |
| 16 | Preston Talkins | 12 | Son | — | Montana |
| 17 | Katherine Talkins | 7 | Daughter | — | Montana |
| 18 | Nelson Talkins | 3 | Son | — | Montana |
| 19 | Georgia O. Fiske | 34 | Head | Common Laborer | Minnesota |
| 20 | Ilene Fiske | 8 | Daughter | — | North Dakota |
| 21 | Myrtle Fiske | 6 | Daughter | — | Montana |
| 22 | Joyce Fiske | 5 | Daughter | — | Montana |
| 23 | Glenn Knapp | 40 | Head | Carpenter Helper | Iowa |
| 24 | Mary O. Knapp THIS PERSON | 33 | Wife | — | Iowa |
| 25 | Virginia Knapp | 13 | Daughter | — | Montana |
| 26 | Rita Knapp | 11 | Daughter | — | Montana |
| 27 | Narlene Knapp | 10 | Daughter | — | Montana |
| 28 | Theodora Knapp | 5 | Daughter | — | Washington |
| 29 | Patricia Knapp | 2 | Daughter | — | Montana |
| 30 | Neva Bade Flesh Knapp | 56 | Mother-in-law | — | — |
| 31 | Arthur E. Nehring | 57 | Head | Foreman | North Dakota |
| 32 | Annie E. Nehring | 50 | Wife | — | Kansas |
| 33 | Earl A. Nehring | 19 | Son | — | Montana |
| 34 | Lola Banks | 20 | Step-daughter | — | Montana |
| 35 | Cora Jerome Campbell | 18 | Niece | Housekeeper | Oregon |
| 36 | Geraldine Campbell | 17 | Niece | — | California |
| 37 | Glenn Campbell | 15 | Nephew | — | California |
| 38 | Kenneth Campbell | 10 | Nephew | — | Minnesota |
| 39 | Stanley Campbell | 6 | Nephew | — | Colorado |
| 40 | Lillian Brusing | 49 | Head | Dishwasher | Minnesota |
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)