MC
Mary Crosby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Webster-County, Iowa
Our Model Tree links this Mary Crosby across the 1930 and 1940 US Censuses in Webster-County, Iowa (XGBoost, ~Confirmed) — first a daughter (b.~1930), then head of a 7-person household.
Age 10
b. ~1930
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Webster-County, Iowa |
| Surname | Crosby |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ft. Dodge |
| 1935 Residence (County) | Webster |
| Additional Details | |
| Highest Grade | 3 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Ft Dodge |
| Est. Birth Year | ~1930 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alma Crosby | Head | — | 47 | ~1893 |
| Robert Crosby | Son | — | 17 | ~1923 |
| William Crosby | Son | — | 8 | ~1932 |
| Howard Crosby | Son | — | 13 | ~1927 |
| Richard Crosby | Son | — | 19 | ~1921 |
| Grace Crosby | Daughter | — | 21 | ~1919 |
| Mary Crosby | Daughter | — | 10 | ~1930 |
Census Appearances
1930
Webster, Iowa
Daughter, age
Webster, Iowa · implied b. ~1930 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Crosby |
| Given Name | Marjorie F. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Webster-County, Iowa
Daughter, age 10
Webster-County, Iowa · implied b. ~1930 — 7 household members
| Surname | Crosby |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ft. Dodge |
| 1935 Residence (County) | Webster |
| Highest Grade | 3 |
| 1935 Residence | Same place |
| 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 Crosby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Crosby
Daughter · 1940 · age 10 · b. ~1930 · Iowa
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Sibling
Richard Crosby
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Crosby
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Howard Crosby
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Crosby
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Grace Crosby
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 — Webster-County, Iowa
Open full size
1940 US Federal Census — Webster-County, Iowa
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01212-01054)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Theodore F. Kroener | 67 | Head | — | Illinois |
| 42 | Alma Crosby | 47 | Head | — | Iowa |
| 43 | Grace G. Crosby | 21 | Daughter | Hair Dresser | Iowa |
| 44 | Richard S. Crosby | 19 | Son | Loader | Iowa |
| 45 | Robert F. Crosby | 17 | Son | Truck Helper | Iowa |
| 46 | Howard Crosby | 13 | Son | — | Iowa |
| 47 | Mary J. Crosby THIS PERSON | 10 | Daughter | — | Iowa |
| 48 | William L. Crosby | 8 | Son | — | Iowa |
| 49 | Jacob W. Reis | 53 | Head | Sorter | Russia |
| 50 | Barbara M. Reis | 48 | Wife | — | Russia |
| 51 | Barbara N. Reis | 23 | Daughter | Maid | Iowa |
| 52 | Elizabeth M. Reis | 16 | Daughter | — | Iowa |
| 53 | John W. Reis | 15 | Son | — | Iowa |
| 54 | Adam W. Reis | 13 | Son | — | Iowa |
| 55 | Ursula M. Reis | 10 | Daughter | — | Iowa |
| 56 | David W. Lundgren | 31 | Head | Abstractor | Iowa |
| 57 | Marcella Lundgren | 28 | Wife | — | Iowa |
| 58 | Clara Gustafson | 71 | Head | — | Sweden |
| 59 | Carl S. Gustafson | 44 | Son | Pressfeeder | Illinois |
| 60 | Frank J. Winkels | 45 | Son-in-law | Salesman | Missouri |
| 61 | Edith V. Winkels | 43 | Daughter | — | Illinois |
| 62 | Edith E. Winkels | 5 | Gr. Daughter | — | Illinois |
| 63 | Frank Jacobson | 50 | Head | Superintendent | Iowa |
| 64 | Elizabeth B. Jacobson | 50 | Wife | — | Iowa |
| 65 | William Spick | 80 | Father-in-law | — | Germany |
| 66 | Clifford Clabaugh | 35 | Head | Meat Inspector | Iowa |
| 67 | Anna M. Clabaugh | 37 | Wife | — | Iowa |
| 68 | Georgiana Clabaugh | 14 | Daughter | — | Pennsylvania |
| 69 | William J. Clabaugh | 4 | Son | — | Illinois |
| 70 | Dean E. Clabaugh | 0 | Son | — | Iowa |
| 71 | Jennie Clabaugh | 61 | Mother | — | Iowa |
| 72 | Patrick W. Archer | 58 | Head | Owner | Iowa |
| 73 | Lillian Archer | 44 | Wife | Laborer | Iowa |
| 74 | Lois G. Archer | 12 | Daughter | — | Iowa |
| 75 | Stuart H. Baird | 27 | Son-in-law | Driver | Oregon |
| 76 | Doris A. Baird | 26 | Daughter | Saleslady | Iowa |
| 77 | Stuart R. Jr. Baird | 2 | Son | — | Iowa |
| 78 | George W. Landgren | 47 | Head | Owner | Iowa |
| 79 | Cleo K. Landgren | 37 | Wife | — | 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)