MC
Martha Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · King-County, Washington
Our Model Tree links this Martha Cooper across the 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed) — first a spouse (b.~1908), then head of a 7-person household.
Age 32
b. ~1908
Female
Spouse
Born: Washington
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | Cooper |
| Given Name | Martha |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle |
| 1935 Residence (County) | King |
| Additional Details | |
| Industry | none |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Wash. |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Township / Ward | Foy Election Prec |
| Est. Birth Year | ~1908 |
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 Martha | Age | Birth yr |
|---|---|---|---|---|
| Jean Cooper | Daughter | — | 2 | ~1938 |
| Harold Cooper | Head | — | 35 | ~1905 |
| Janet Cooper | Daughter | — | 2 | ~1938 |
| Allen Cooper | Son | — | 10 | ~1930 |
| John Cooper | Son | — | 12 | ~1928 |
| Martha Cooper | Spouse | — | 32 | ~1908 |
| Donna Cooper | Daughter | — | 7 | ~1933 |
Census Appearances
1930
King, Washington
Spouse, age 22
King, Washington · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Martha |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Married |
| Birthplace | Washington |
| Age at First Marriage | 17 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Denmark |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Spouse, age 32
King-County, Washington · implied b. ~1908 — 7 household members
| Surname | Cooper |
| Given Name | Martha |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle |
| 1935 Residence (County) | King |
| Industry | none |
| Income (1939) | 0 |
| Highest Grade | Hs 1 |
| 1935 Residence | Wash. |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 Cooper across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Martha Cooper
Spouse · 1940 · age 32 · b. ~1908 · Washington
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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 — King-County, Washington
Open full size
1940 US Federal Census — King-County, Washington
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-04344-00387)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Harold Cooper | 35 | Head | Clerk | Kansas |
| 42 | Martha Cooper THIS PERSON | 32 | Wife | — | Washington |
| 43 | John Cooper | 12 | Son | — | California |
| 44 | Allen Cooper | 10 | Son | — | Washington |
| 45 | Donna Cooper | 7 | Daughter | — | Washington |
| 46 | Janet Cooper | 2 | Daughter | — | Washington |
| 47 | Jean Cooper | 2 | Daughter | — | Washington |
| 48 | Archie Olson | 36 | Head | Window Trimmer | Washington |
| 49 | Deborah Olson | 35 | Wife | — | Oregon |
| 50 | Archie Jr. Olson | 16 | Son | — | Washington |
| 51 | Otto Shade | 46 | Head | Buyer | Iowa |
| 52 | Josephine Shade | 39 | Wife | — | Oregon |
| 53 | Fay Jorgensen | 23 | Roomer | Salesman | So Dakota |
| 54 | Marion Jorgensen | 19 | Daughter | — | California |
| 55 | Wanda Shade | 17 | Daughter | — | California |
| 56 | George T Wyckoff | 37 | Head | Inspector | Washington |
| 57 | Pauline Wyckoff | 29 | Wife | — | Washington |
| 58 | Ann Wyckoff | 6 | Daughter | — | Washington |
| 59 | Harper Mcneill | 39 | Head | Dept Manager | Canada |
| 60 | Margaret Mcneill | 39 | Wife | — | Canada |
| 61 | Clifford T Clark | 48 | Head | Chef | Washington |
| 62 | Pauline Clark | 50 | Wife | Lunch Room | Illinois |
| 66 | John Lien | 63 | Head | Janitor | Norway |
| 67 | Gina Lien | 56 | Wife | — | Norway |
| 68 | Arthur Lien | 27 | Son | Mechanic | Minnesota |
| 69 | Ruth Lien | 18 | Daughter | Housework | Minnesota |
| 70 | George Lien | 24 | Son | Painter | Minnesota |
| 71 | Stanley Lien | 13 | Son | — | Minnesota |
| 72 | Henry W Weaver | 55 | Head | Mechanic | Missouri |
| 73 | Gladys R Weaver | 43 | Wife | Bookkeeper | California |
| 74 | Charles Berg | 31 | Head | Meat Cutter | Michigan |
| 75 | Gertrude M Berg | 29 | Wife | — | Illinois |
| 76 | Bonnie Jean Berg | 14 | Daughter | — | Washington |
| 77 | Patsy Mae Berg | 8 | Daughter | — | Washington |
| 78 | Edwin Stahl | 48 | Head | Machinist | Ohio |
| 79 | Lena Stahl | 42 | Wife | — | Kansas |
| 80 | Bertha Williams | 39 | Head | Tavern Worker | Germany |
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)