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Mary Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Canadian-County, Oklahoma
Our Model Tree links this Mary Lopez across the 1930 and 1940 US Censuses in Canadian-County, Oklahoma (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Female
Daughter
Born: Oklahoma
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Canadian-County, Oklahoma |
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Oklahoma |
| 1935 Residence (City) | Calumet |
| 1935 Residence (County) | Canadian |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
| Township / Ward | Calumet |
| Est. Birth Year | ~1928 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Lopez | Daughter | — | 12 | ~1928 |
| Alfred Lopez | Son | — | 19 | ~1921 |
| Birdie Lopez | Daughter | — | 5 | ~1935 |
| Beatrice Lopez | Daughter | — | 2 | ~1938 |
| Nathalie Lopez | Spouse | — | 34 | ~1906 |
| Donald Lopez | Son | — | 16 | ~1924 |
| Joseph Lopez | Son | — | 14 | ~1926 |
| Augustine Lopez | Head | — | 45 | ~1895 |
| Arthur Lopez | Son | — | 18 | ~1922 |
Census Appearances
1930
Canadian, Oklahoma
Daughter, age 2
Canadian, Oklahoma · implied b. ~1928 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Mexican |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Oklahoma |
| Father's Birthplace | Mexico |
| Mother's Birthplace | Mexico |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
1940
Canadian-County, Oklahoma
Daughter, age 12
Canadian-County, Oklahoma · implied b. ~1928 — 9 household members
| Surname | Lopez |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Oklahoma |
| 1935 Residence (City) | Calumet |
| 1935 Residence (County) | Canadian |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Oklahoma |
| Birth Country | United States |
| Birthplace (normalized) | oklahoma |
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 Lopez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lopez
Daughter · 1940 · age 12 · b. ~1928 · Oklahoma
★ You are viewing this record
Sibling
Beatrice Lopez
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Birdie Lopez
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alfred Lopez
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Lopez
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Lopez
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Arthur Lopez
Sibling · 1940 · age 18
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 — Canadian-County, Oklahoma
Open full size
1940 US Federal Census — Canadian-County, Oklahoma
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03280-00016)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Augustine Lopez | 45 | Head | Section | Mexico |
| 42 | Nathalie Lopez | 34 | Wife | — | Mexico |
| 43 | Alfred Lopez | 19 | Son | — | Oklahoma |
| 44 | Arthur Lopez | 18 | Son | New Worker | Oklahoma |
| 45 | Donald Lopez | 16 | Son | — | Oklahoma |
| 46 | Joseph Lopez | 14 | Son | — | Oklahoma |
| 47 | Mary Lopez THIS PERSON | 12 | Daughter | — | Oklahoma |
| 48 | Birdie Lopez | 5 | Daughter | — | Oklahoma |
| 49 | Beatrice Lopez | 2 | Daughter | — | Oklahoma |
| 50 | Elmo Dupe | 30 | Head | Clerk | Oklahoma |
| 51 | Wilma D. Dupe | 27 | Wife | — | West Virginia |
| 52 | Charles Philip Dupe | 1 | Son | — | Oklahoma |
| 53 | Marty Lee Plato | 58 | Head | Carpenter | Oklahoma |
| 54 | Margaret D. Plato | 52 | Wife | — | Texas |
| 55 | Hattie Moore | 54 | Sister-in-law | — | Texas |
| 56 | Floyd Emberson | 52 | Head | Machinist | Texas |
| 57 | Hazel Emberson | 31 | Wife | — | Oklahoma |
| 58 | Charles Jr. Shelton | 13 | Step son | — | Oklahoma |
| 59 | Vera Ann Shelton | 12 | Step daughter | — | Oklahoma |
| 60 | Alice D. Nail | 57 | Head | — | Arkansas |
| 61 | Charles H. Nail | 19 | Son | Truck Driver | Oklahoma |
| 62 | William H. Miller | 58 | Head | Medical Doctor | Virginia |
| 63 | Eloise Miller | 47 | Wife | — | Missouri |
| 64 | William L. Dickson | 38 | Head | Operator | Oklahoma |
| 65 | Helen D. Dickson | 24 | Wife | — | Oklahoma |
| 66 | Frank E. Hall | 54 | Head | Ice Puller | Kansas |
| 67 | Julia Hall | 62 | Wife | — | Ohio |
| 68 | Myrtle Clayton | 53 | Head | — | Missouri |
| 69 | George Lindenberg | 58 | Brother | — | Missouri |
| 70 | Max H. Rollins | 25 | Head | Carpenter | Arkansas |
| 71 | Ruth Rollins | 24 | Wife | — | Oklahoma |
| 72 | Janis Rollins | 2 | Daughter | — | Oklahoma |
| 73 | Eliza Loring | 67 | Head | — | Iowa |
| 74 | Rudolph D. Loring | 30 | Son | Clerk | Iowa |
| 75 | Walter Loring | 25 | Son | Operator | Iowa |
| 76 | Gertrude Loring | 20 | Daughter-in-law | — | Oklahoma |
| 77 | Irene H. Laughlin | 60 | Head | Piano Dealer | West Virginia |
| 78 | Amelia Laughlin | 47 | Wife | — | West Virginia |
| 79 | Ellen Jean Laughlin | 15 | Daughter | — | Oklahoma |
| 80 | Ella Louise Laughlin | 13 | Daughter | — | Oklahoma |
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)