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Mary Montgomery — 1940 US Census Record
Linked across censuses1940 United States Federal Census · O'Brien-County, Iowa
Our Model Tree links this Mary Montgomery across the 1920, 1930 and 1940 US Censuses in O'Brien-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1879), then head of a 3-person household.
Age 61
b. ~1879
Female
Spouse
Born: Norway
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | O'Brien-County, Iowa |
| Surname | Montgomery |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Norway |
| 1935 Residence (City) | Sheldon City |
| 1935 Residence (County) | O'Brien |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
| Township / Ward | Sheldon City |
| Est. Birth Year | ~1879 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Marie Montgomery | Daughter | — | 35 | ~1905 |
| Charles Montgomery | Head | — | 64 | ~1876 |
| Mary Montgomery | Spouse | — | 61 | ~1879 |
Census Appearances
1920
Monona, Iowa
Spouse, age 40
Monona, Iowa · implied b. ~1880 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Montgomery |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Norway |
| Year of Immigration | 1880 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Norwegian |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
1930
Cerro Gordo, …
Other, age 50
Cerro Gordo, Iowa · implied b. ~1880 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Montgomery |
| Given Name | Mary |
| Relationship to Head | wife-H |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Norway |
| Year of Immigration | 1880 |
| Age at First Marriage | 19 |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
1940
O'Brien-County, Iowa
Spouse, age 61
O'Brien-County, Iowa · implied b. ~1879 — 3 household members
| Surname | Montgomery |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Norway |
| 1935 Residence (City) | Sheldon City |
| 1935 Residence (County) | O'Brien |
| Naturalization Status | Naturalized |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth Country | Norway |
| Birthplace (normalized) | norway |
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 Montgomery across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Montgomery
Spouse · 1940 · age 61 · b. ~1879 · Iowa
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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 — O'Brien-County, Iowa
Open full size
1940 US Federal Census — O'Brien-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01187-00060)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Calvin Clark | 14 | Daughter | Helper Body Shop | Minnesota |
| 2 | Lloyd Clark | 13 | Son | — | Minnesota |
| 3 | Joyce Clark | 11 | Daughter | — | Iowa |
| 4 | Faye Clark | 6 | Daughter | — | Iowa |
| 5 | O. F. Hayes | 66 | Head | Housewife | Illinois |
| 6 | Joseph R. Hahn | 72 | Head | Carpenter | Iowa |
| 7 | Katie Hahn | 62 | Wife | — | Holland |
| 8 | John Hahn | 37 | Son | Salesman | Iowa |
| 9 | Edward Hahn | 22 | Son | Car Repairer | Iowa |
| 10 | Fern Hahn | 20 | Daughter | — | Iowa |
| 11 | Vernon De Witt | 12 | Guest | — | Iowa |
| 12 | Margaret Grogan | 13 | Guest | — | Iowa |
| 13 | Charles Brown | 32 | Head | District Mgr. | Kentucky |
| 14 | Mary Brown | 27 | Wife | — | Penn |
| 15 | Mervin Benning | 33 | Head | Salesman | Nebraska |
| 16 | Mable Benning | 33 | Wife | — | Nebraska |
| 17 | Donald Benning | 8 | Son | — | Kansas |
| 18 | William H. Bowker | 22 | Head | Mgr. City | Iowa |
| 19 | Le Jean Bowker | 22 | Wife | — | Iowa |
| 20 | Mary Louise Bowker | 5 | Daughter | — | Iowa |
| 21 | Roberta Bowker | 2 | Daughter | — | Illinois |
| 22 | Eric Patrick | 41 | Head | Engineer | — |
| 23 | Elma Patrick | 40 | Wife | — | Iowa |
| 24 | Donald Patrick | 17 | Son | — | N. Dakota |
| 25 | Mildred Patrick | 12 | Daughter | — | N. Dakota |
| 26 | Darlene Patrick | 8 | Daughter | — | Iowa |
| 27 | Allen Patrick | 2 | Son | — | Iowa |
| 28 | William C. Lucia | 25 | Head | Mgr. Drug | Iowa |
| 29 | Maxine Lucia | 23 | Wife | — | Iowa |
| 30 | Jolean Lucia | 4 | Daughter | — | Iowa |
| 31 | Robert Lucia | 23 | Brother | Photographer | Iowa |
| 32 | Charles Montgomery | 64 | Head | — | Iowa |
| 33 | Mary Montgomery THIS PERSON | 61 | Wife | — | Norway |
| 34 | Marie Montgomery | 35 | Daughter | Saleslady | Iowa |
| 35 | Victor Bogard | 24 | Head | Cleaning | Iowa |
| 36 | Nelina Bogard | 21 | Wife | — | Iowa |
| 37 | Victor Jr. Bogard | 2 | Son | — | Iowa |
| 38 | John W. Mulder | 38 | Head | Salesman | Iowa |
| 39 | Loretta Mulder | 37 | Wife | — | Iowa |
| 40 | Shirley Mulder | 2 | Daughter | — | Iowa |
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)