MK
Martha King — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this Martha King across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1895), then head of a 5-person household.
Age 45
b. ~1895
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | King |
| Given Name | Martha A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Carbon Cliff |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Carbon Cliff |
| Est. Birth Year | ~1895 |
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 Martha | Age | Birth yr |
|---|---|---|---|---|
| Marilyn King | Daughter | — | 16 | ~1924 |
| John King | Son | — | 14 | ~1926 |
| Thomas King | Head | — | 49 | ~1891 |
| Winifred King | Daughter | — | 20 | ~1920 |
| Martha King | Spouse | — | 45 | ~1895 |
Census Appearances
1920
Rock Island, …
Spouse, age 25
Rock Island, Illinois · implied b. ~1895 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | King |
| Given Name | Martha |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Rock Island, …
Other, age 35
Rock Island, Illinois · implied b. ~1895 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | King |
| Given Name | Martha |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 17 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Rock-Island-County, Illinois
Spouse, age 45
Rock-Island-County, Illinois · implied b. ~1895 — 5 household members
| Surname | King |
| Given Name | Martha A. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Carbon Cliff |
| 1935 Residence (County) | Rock Island |
| Highest Grade | No 8 |
| 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 Martha King across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Martha King
Spouse · 1940 · age 45 · b. ~1895 · Illinois
★ 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 — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00874-00669)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas P. King | 49 | Head | Switchman | Iowa |
| 42 | Martha A. King THIS PERSON | 45 | Wife | — | Iowa |
| 43 | Winifred King | 20 | Daughter | — | Illinois |
| 44 | Marilyn King | 16 | Daughter | — | Illinois |
| 45 | John Patrick King | 14 | Son | — | Illinois |
| 46 | William Griffin | 54 | Head | Contractor | Illinois |
| 47 | Josephine Griffin | 53 | Wife | — | Iowa |
| 48 | Emily E. Griffin | 25 | Daughter | Teacher | Illinois |
| 49 | Wyeth Griffin | 22 | Son | Truck Driver | Illinois |
| 50 | Josephine Griffin | 20 | Daughter | — | Illinois |
| 51 | Charles H. Weekley | 64 | Head | Skilled Laborer | Indiana |
| 52 | Mary V. Weekley | 63 | Wife | — | Ohio |
| 53 | Henry G. Weekley | 24 | Son | — | Missouri |
| 54 | Harold Collins | 10 | Grandson | — | Missouri |
| 55 | Charles P. Weekley | 29 | Son | Laborer | Illinois |
| 56 | Leona Weekley | 25 | Wife | — | Illinois |
| 57 | Walter Rauschman | 31 | Head | Clerk | Illinois |
| 58 | Florence Rauschman | 28 | Wife | — | Illinois |
| 59 | Patsy Lou Rauschman | 1 | Daughter | — | Illinois |
| 60 | Frank Franck | 25 | Head | Laborer | Illinois |
| 61 | Anthony Franck | 20 | Brother | Laborer | Illinois |
| 62 | Albert Franck | 16 | Brother | — | Illinois |
| 63 | Mathew Mc Cune | 44 | Head | Laborer | Illinois |
| 64 | Hilda A. Mc Cune | 49 | Wife | — | Illinois |
| 65 | Marvin Mc Cune | 15 | Son | Laborer | Illinois |
| 66 | Ruby Mc Cune | 13 | Daughter | — | Illinois |
| 67 | Earl Johnson | 50 | Head | Laborer | Missouri |
| 68 | Stella Johnson | 46 | Wife | — | Missouri |
| 69 | Richard Johnson | 25 | Son | New Worker | Missouri |
| 70 | Bernard Johnson | 22 | Son | New Worker | Iowa |
| 71 | George L. Smith | 44 | Head | Farmer | Illinois |
| 72 | Ruth Smith | 42 | Wife | Manager | Illinois |
| 73 | Warren Smith | 20 | Son | — | Iowa |
| 74 | Ray Smith | 29 | Head | Skilled Laborer | Iowa |
| 75 | Mildred Smith | 30 | Wife | — | Illinois |
| 76 | Marcia L. Smith | 5 | Daughter | — | Illinois |
| 77 | Virginia M. Smith | 3 | Daughter | — | Illinois |
| 78 | Lola E. Smith | 2 | Daughter | — | Illinois |
| 79 | William M. Smith | 0 | Son | — | Illinois |
| 80 | Emiel Poolvoorde | 44 | Head | Laborer | Belgium |
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)