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Jack Martin — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Chickasaw-County, Iowa
Our Model Tree links this Jack Martin across the 1930 and 1940 US Censuses in Chickasaw-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 11-person household.
Age 17
b. ~1923
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Chickasaw-County, Iowa |
| Surname | Martin |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Fredericksburg Twp |
| 1935 Residence (County) | Chickasaw |
| Additional Details | |
| Occupation | Farmhand |
| Industry | Farming |
| Class of Worker | PW |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmhand |
| Township / Ward | Fredericksburg Twp |
| 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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jack | Age | Birth yr |
|---|---|---|---|---|
| Jack Martin | Son | — | 17 | ~1923 |
| Harry Martin | Head | — | 43 | ~1897 |
| Jessie Walker | Other | — | 66 | ~1874 |
| John Walker | Other | — | 74 | ~1866 |
| Marie Martin | Daughter | — | 11 | ~1929 |
| Phyllis Martin | Daughter | — | 21 | ~1919 |
| Harry Martin | Son | — | 2 | ~1938 |
| Rowena Martin | Daughter | — | 19 | ~1921 |
| Myron Martin | Spouse | — | 40 | ~1900 |
| Marjorie Martin | Daughter | — | 14 | ~1926 |
| Marilyn Martin | Daughter | — | 15 | ~1925 |
Census Appearances
1930
Chickasaw, Iowa
Other, age 7
Chickasaw, Iowa · implied b. ~1923 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Jack |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Chickasaw-County, Iowa
Son, age 17
Chickasaw-County, Iowa · implied b. ~1923 — 11 household members
| Surname | Martin |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Fredericksburg Twp |
| 1935 Residence (County) | Chickasaw |
| Occupation | Farmhand |
| Industry | Farming |
| Class of Worker | PW |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 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 Jack Martin across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Martin
Son · 1940 · age 17 · b. ~1923 · Iowa
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Sibling
Marilyn Martin
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Martin
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rowena Martin
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Harry Martin
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marjorie Martin
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Phyllis Martin
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 — Chickasaw-County, Iowa
Open full size
1940 US Federal Census — Chickasaw-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01147-00850)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Claire Sheridan | 5 | Daughter | — | Iowa |
| 42 | Annabelle Sheridan | 2 | Daughter | — | Iowa |
| 43 | Jesse H. Trease | 53 | Head | Farmer | Iowa |
| 44 | Martha J. Trease | 53 | Wife | Housewife | Illinois |
| 45 | Lynn H. Trease | 24 | Son | Farmer | Iowa |
| 46 | Merle L. Trease | 22 | Son | Farmer | Iowa |
| 47 | Green A. Hunt | 36 | Head | Farmer | Iowa |
| 48 | Bernice S. Hunt | 34 | Wife | Housewife | Iowa |
| 49 | Benjamin Herrick | 57 | Head | Farmer | Iowa |
| 50 | Nellie Q. Herrick | 41 | Wife | Housewife | Iowa |
| 51 | John Herrick | 84 | Father | — | New York |
| 52 | Clyde Potter | 54 | Head | Farmer | Iowa |
| 53 | Belle Potter | 50 | Wife | Housewife | Wisconsin |
| 54 | Emery Mclean | 46 | Head | Farmer | Iowa |
| 55 | Linnie A. Mclean | 45 | Wife | Housewife | Iowa |
| 56 | Ellsworth Mclean | 21 | Son | Farmhand | Iowa |
| 57 | Fred C. Richardson | 40 | Head | Farmer | Iowa |
| 58 | Mildred Richardson | 34 | Wife | Housewife | Iowa |
| 59 | Marilyn J. Richardson | 10 | Daughter | — | Iowa |
| 60 | Donald L. Richardson | 8 | Son | — | Iowa |
| 61 | David E. Richardson | 2 | Son | — | Iowa |
| 62 | Gottlieb Kettle | 50 | Head | Farmer | Germany |
| 63 | Christina Kettle | 45 | Wife | Housewife | Iowa |
| 64 | Leslie H. Kettle | 19 | Son | Farmhand | Iowa |
| 65 | Glenn L. Kettle | 11 | Son | — | Iowa |
| 66 | Harry E. Martin | 43 | Head | Farming | Iowa |
| 67 | Myron Martin | 40 | Wife | Housewife | Iowa |
| 68 | Phyllis Martin | 21 | Daughter | Housewife | Iowa |
| 69 | Rowena R. Martin | 19 | Daughter | Housewife | Iowa |
| 70 | Jack Martin THIS PERSON | 17 | Son | Farmhand | Iowa |
| 71 | Marilyn J. Martin | 15 | Daughter | Housewife | Iowa |
| 72 | Marjorie Martin | 14 | Daughter | Housewife | Iowa |
| 73 | Marie B. Martin | 11 | Daughter | — | Iowa |
| 74 | Harry J. Martin | 2 | Son | — | Iowa |
| 75 | John A. Walker | 74 | Father | — | England |
| 76 | Jessie D. Walker | 66 | Mother | Housewife | Iowa |
| 77 | Will H. Reinner | 56 | Head | Farmer | Iowa |
| 78 | Ida Reinner | 51 | Wife | Housewife | Iowa |
| 79 | Elmer J. Hilcher | 52 | Head | Farmer | Iowa |
| 80 | Laura C. Hilcher | 44 | Wife | Housewife | 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)