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Harold Martin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Keokuk-County, Iowa
Our Model Tree links this Harold Martin across the 1920, 1930 and 1940 US Censuses in Keokuk-County, Iowa (XGBoost, ~Confirmed), with identified parents Frank & Ida — first a head (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Keokuk-County, Iowa |
| Surname | Martin |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Steady Run Township |
| 1935 Residence (County) | Keokuk County |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 52 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Steady Run Township |
| Est. Birth Year | ~1910 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Harold Martin | Head | — | 30 | ~1910 |
| Darrell Martin | Son | — | 4 | ~1936 |
| Claire Martin | Son | — | 2 | ~1938 |
| Mary Martin | Daughter | — | ~1940 | |
| Arlene Martin | Spouse | — | 25 | ~1915 |
Census Appearances
1920
Keokuk, Iowa
Son, age 10
Keokuk, Iowa · implied b. ~1910 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Harold J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Keokuk, Iowa
Son, age 20
Keokuk, Iowa · implied b. ~1910 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Keokuk-County, Iowa
Head, age 30
Keokuk-County, Iowa · implied b. ~1910 — 5 household members
| Surname | Martin |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Steady Run Township |
| 1935 Residence (County) | Keokuk County |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 52 |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 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 Harold Martin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Martin (~0.92 confidence) and mother Ida Martin (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Martin
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Ida Martin
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Martin
Head · 1940 · age 30 · b. ~1910 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Keokuk-County, Iowa
Open full size
1940 US Federal Census — Keokuk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01172-01032)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Carl D. Huninger | 42 | Head | Farmer | Iowa |
| 2 | Lulu Huninger | 41 | Wife | — | Iowa |
| 3 | Pauline Huninger | 14 | Daughter | — | Iowa |
| 4 | Carl Wilson Huninger | 11 | Son | — | Iowa |
| 5 | Larry Huninger | 4 | Son | — | Iowa |
| 6 | Harold Smith | 39 | Head | Farmer | Iowa |
| 7 | Grace Q. Smith | 38 | Wife | — | Iowa |
| 8 | Marylin Jean Smith | 12 | Daughter | — | Iowa |
| 9 | Betty Lou Smith | 8 | Daughter | — | Iowa |
| 10 | Cecil Mcmaster | 48 | Head | Farmer | Missouri |
| 11 | Elizabeth Mcmaster | 43 | Wife | — | Missouri |
| 12 | Cecil Jr. Mcmaster | 16 | Son | — | Missouri |
| 13 | Harry Mcmaster | 14 | Son | — | Missouri |
| 14 | Richard Mcmaster | 11 | Son | — | Missouri |
| 15 | Carolyn Mcmaster | 4 | Daughter | — | Iowa |
| 16 | Marilyn Mcmaster | 1 | Daughter | — | Iowa |
| 17 | Doyle S. Hutton | 32 | Head | Farmer | Iowa |
| 18 | Ferne Hutton | 33 | Wife | — | Iowa |
| 19 | Leon Hutton | 12 | Son | — | Iowa |
| 20 | Jennie Lee Hutton | 4 | Daughter | — | Iowa |
| 21 | Elizabeth Ann Hutton | 2 | Daughter | — | Iowa |
| 22 | Alice Bell Hutton | 62 | Head | — | Iowa |
| 23 | William Hadsell | 53 | Head | Farmer | Iowa |
| 24 | Harold Hadsell | 49 | Brother | Farmer | Iowa |
| 25 | Charlie Hadsell | 56 | Brother | Operator | Iowa |
| 26 | Frank E. Martin | 65 | Head | Farmer | Iowa |
| 27 | Ida Martin | 64 | Wife | — | Iowa |
| 28 | Ethel Martin | 35 | Daughter | — | Iowa |
| 29 | Forrest Martin | 22 | Son | Farmer | Iowa |
| 30 | Wilma Martin | 18 | Daughter | — | Iowa |
| 31 | Harold Martin THIS PERSON | 30 | Head | Farmer | Iowa |
| 32 | Arlene Martin | 25 | Wife | — | Iowa |
| 33 | Darrell Dean Martin | 4 | Son | — | Iowa |
| 34 | Claire Avon Martin | 2 | Son | — | Iowa |
| 35 | Mary Ann Martin | 0 | Daughter | — | Iowa |
| 36 | E. W. Green | 84 | Head | — | Ohio |
| 37 | Alice Green | 78 | Wife | — | Iowa |
| 38 | John R. Jones | 24 | Head | Farmer | Iowa |
| 39 | Winnifred Jones | 19 | Wife | Teacher | Iowa |
| 40 | Fred S. Seevers | 49 | Head | Farmer | Iowa |
Pedigree Summary
Harold
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
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)