ML
Maria Lopez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Pima-County, Arizona
Our Model Tree links this Maria Lopez across the 1930 and 1940 US Censuses in Pima-County, Arizona (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 9-person household.
Age 19
b. ~1921
Female
Daughter
Born: Arizona
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Pima-County, Arizona |
| Surname | Lopez |
| Given Name | Maria |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Arizona |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Pima |
| Additional Details | |
| Class of Worker | 50 |
| Highest Grade | 8 |
| 1935 Residence | Arizona |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
| Township / Ward | C S D 2 |
| Est. Birth Year | ~1921 |
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 Maria | Age | Birth yr |
|---|---|---|---|---|
| Maria Lopez | Daughter | — | 19 | ~1921 |
| Edward Lopez | Son | — | 3 | ~1937 |
| Jesus Lopez | Daughter | — | 5 | ~1935 |
| Alfredo Lopez | Son | — | 16 | ~1924 |
| Carmela Lopez | Daughter | — | 10 | ~1930 |
| Lupe Lopez | Daughter | — | 8 | ~1932 |
| Romualdo Lopez | Head | — | 38 | ~1902 |
| Francisco Lopez | Son | — | 18 | ~1922 |
| Josephine Lopez | Daughter | — | 13 | ~1927 |
Census Appearances
1930
Pima, Arizona
Other, age 8
Pima, Arizona · implied b. ~1922 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lopez |
| Given Name | Maria |
| Relationship to Head | Step Daughter |
| Sex | F |
| Color / Race | American Indian |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Arizona |
| Father's Birthplace | Full Blood |
| Mother's Birthplace | Papago |
| Occupation | none |
| Can Read/Write | No |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
1940
Pima-County, Arizona
Daughter, age 19
Pima-County, Arizona · implied b. ~1921 — 9 household members
| Surname | Lopez |
| Given Name | Maria |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Arizona |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Pima |
| Class of Worker | 50 |
| Highest Grade | 8 |
| 1935 Residence | Arizona |
| Birth State | Arizona |
| Birth Country | United States |
| Birthplace (normalized) | arizona |
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 Maria Lopez across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Maria Lopez
Daughter · 1940 · age 19 · b. ~1921 · Arizona
★ You are viewing this record
Sibling
Jesus Lopez
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alfredo Lopez
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Lopez
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Josephine Lopez
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lupe Lopez
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francisco Lopez
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carmela Lopez
Sibling · 1940 · age 10
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 — Pima-County, Arizona
Open full size
1940 US Federal Census — Pima-County, Arizona
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00112-00775)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Alberto Gonzales | 22 | Son | Laborer | Arizona |
| 42 | Domingo Pesquera | 11 | Granddaughter | — | Arizona |
| 43 | Francisca Pesquera | 5 | Granddaughter | — | Arizona |
| 45 | Regio Madrid | 60 | Head | Laborer | Arizona |
| 46 | Rosario Madrid | 58 | Wife | — | Mexico |
| 47 | Epani Madrid | 15 | Son | — | Arizona |
| 48 | Felix Madrid | 19 | Son | Laborer | Arizona |
| 49 | Epemeno Madrid | 12 | Son | — | Arizona |
| 50 | Romualdo Lopez | 38 | Head | Laborer | Arizona |
| 51 | Maria Lopez THIS PERSON | 19 | Daughter | — | Arizona |
| 52 | Francisco Lopez | 18 | Son | Laborer | Arizona |
| 53 | Alfredo Lopez | 16 | Son | — | Arizona |
| 54 | Josephine Lopez | 13 | Daughter | — | Arizona |
| 55 | Carmela Lopez | 10 | Daughter | — | Arizona |
| 56 | Lupe Lopez | 8 | Daughter | — | Arizona |
| 57 | Jesus Lopez | 5 | Daughter | — | Arizona |
| 58 | Edward Lopez | 3 | Son | — | Arizona |
| 59 | J. H. Payne | 56 | Head | Laborer | Texas |
| 60 | May Payne | 65 | Wife | — | Texas |
| 61 | Odil Payne | 26 | Son | Laborer | Texas |
| 62 | Annabel Payne | 18 | Daughter | — | Texas |
| 63 | Paul Payne | 16 | Son | — | Texas |
| 64 | Ludd Payne | 14 | Son | — | Texas |
| 65 | Luciano Brocomonte | 50 | Head | Laborer | Mexico |
| 66 | Carmen Brocomonte | 35 | Wife | — | Arizona |
| 67 | Blas Ruth Brocomonte | 21 | Daughter | — | Arizona |
| 68 | Rosa Chalo | 35 | Daughter | — | Arizona |
| 69 | Peter Chalo | 20 | Son | New Worker | Arizona |
| 70 | Mary Ellen Corriella | 1 | Granddaughter | — | Arizona |
| 71 | Pablo Corriella | 14 | Grandson | — | Arizona |
| 72 | Juan Brocomonte | 19 | Son | Laborer | Arizona |
| 73 | Rocho Brocomonte | 17 | Son | — | Arizona |
| 74 | Frank Brocomonte | 23 | Son | Laborer | Arizona |
| 75 | Trivolla Quart | 18 | Nephew | Laborer | Arizona |
| 76 | Arisello Armenta | 61 | Head | Laborer | Mexico |
| 77 | Josepha Armenta | 59 | Wife | — | California |
| 78 | Rosa Armenta | 28 | Daughter | — | Arizona |
| 79 | Mary Armenta | 18 | Daughter | — | Arizona |
| 80 | Tony Armenta | 16 | Son | New Worker | Arizona |
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)