MC
Mary Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Monona-County, Iowa
Our Model Tree links this Mary Cooper across the 1920, 1930 and 1940 US Censuses in Monona-County, Iowa (XGBoost, ~Confirmed) — first a spouse (b.~1896), then head of a 7-person household.
Age 44
b. ~1896
Female
Spouse
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Monona-County, Iowa |
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Soldier Township |
| 1935 Residence (County) | Monona |
| Additional Details | |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Soldier Township |
| Est. Birth Year | ~1896 |
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 |
|---|---|---|---|---|
| Edith Cooper | Daughter | — | 7 | ~1933 |
| Leona Cooper | Daughter | — | 24 | ~1916 |
| Norma Cooper | Daughter | — | 3 | ~1937 |
| Ray Cooper | Head | — | 47 | ~1893 |
| Glenn Cooper | Son | — | 22 | ~1918 |
| Leo Cooper | Son | — | 12 | ~1928 |
| Mary Cooper | Spouse | — | 44 | ~1896 |
Census Appearances
1920
Monona, Iowa
Spouse, age 24
Monona, Iowa · implied b. ~1896 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Monona, Iowa
Spouse, age 34
Monona, Iowa · implied b. ~1896 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 17 |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Monona-County, Iowa
Spouse, age 44
Monona-County, Iowa · implied b. ~1896 — 7 household members
| Surname | Cooper |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Soldier Township |
| 1935 Residence (County) | Monona |
| 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 Mary Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Cooper
Spouse · 1940 · age 44 · b. ~1896 · Iowa
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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 — Monona-County, Iowa
Open full size
1940 US Federal Census — Monona-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01184-00494)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Worthy | 11 | Daughter | — | Iowa |
| 42 | Worthy | 10 | Daughter | — | Iowa |
| 43 | Worthy | 7 | Daughter | — | Iowa |
| 44 | Worthy | 4 | Son | — | Iowa |
| 45 | James Nelson | 39 | Head | Farmer | Iowa |
| 46 | Eunice Nelson | 36 | Wife | — | Iowa |
| 47 | Mercese Nelson | 12 | Daughter | — | Iowa |
| 48 | Joan Nelson | 9 | Daughter | — | Iowa |
| 49 | Vonda Nelson | 6 | Daughter | — | Iowa |
| 50 | Larry Nelson | 3 | Son | — | Iowa |
| 51 | Christian Wingate | 70 | Father-in-law | — | Norway |
| 52 | Henry Nelson | 39 | Head | Farmer | Iowa |
| 53 | Agie Nelson | 37 | Wife | — | Iowa |
| 54 | Dale Nelson | 6 | Son | — | Iowa |
| 55 | Tilla Olsen | 55 | Head | Farmer | Iowa |
| 56 | Marion Olsen | 12 | Son | — | Iowa |
| 57 | Carl Johnson | 54 | Head | Farmer | Iowa |
| 58 | Lula Johnson | 51 | Wife | — | Iowa |
| 59 | Vernon Johnson | 21 | Son | Farm Laborer | Iowa |
| 60 | Basil Gifts | 35 | Head | Farmer | Iowa |
| 61 | Rose Gifts | 29 | Wife | — | Iowa |
| 62 | Edith Gifts | 12 | Daughter | — | Iowa |
| 63 | Raymond Gifts | 10 | Son | — | Iowa |
| 64 | Ruby Gifts | 8 | Daughter | — | Iowa |
| 65 | Marilland Gifts | 3 | Daughter | — | Iowa |
| 66 | Wade Cooper | 38 | Hired hand | Farm Laborer | Iowa |
| 67 | Solon Gifts | 65 | Head | Farm Laborer | Iowa |
| 68 | Anna Gifts | 63 | Wife | — | Iowa |
| 69 | Irvin Gifts | 20 | Son | Farm Laborer | Iowa |
| 70 | Oscar Muntz | 52 | Hired hand | Farmer | Iowa |
| 71 | Ivan Gibbs | 33 | Head | Farmer | Iowa |
| 72 | Gilma Gibbs | 26 | Wife | — | Iowa |
| 73 | Ray Cooper | 47 | Head | Farmer | Iowa |
| 74 | Mary Cooper THIS PERSON | 44 | Wife | — | Iowa |
| 75 | Leona Cooper | 24 | Daughter | Housework | Iowa |
| 76 | Glenn Cooper | 22 | Son | Farm Laborer | Iowa |
| 77 | Leo Cooper | 12 | Son | — | Iowa |
| 78 | Edith Cooper | 7 | Daughter | — | Iowa |
| 79 | Norma Cooper | 3 | Daughter | — | Iowa |
| 80 | M. M. Scierse | 47 | Head | Farmer | Nebraska |
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)