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Juan Martinez — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Las-Animas-County, Colorado
Our Model Tree links this Juan Martinez across the 1920, 1930 and 1940 US Censuses in Las-Animas-County, Colorado (XGBoost, ~Confirmed) — first a head (b.~1878), then head of a 4-person household.
Age 62
b. ~1878
Male
Head
Born: Colorado
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Las-Animas-County, Colorado |
| Surname | Martinez |
| Given Name | Juan A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | North Garcia Plaza |
| 1935 Residence (County) | Las Animas |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Township / Ward | North Garcia Plaza |
| Est. Birth Year | ~1878 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Juan | Age | Birth yr |
|---|---|---|---|---|
| Francisca Martinez | Spouse | — | 56 | ~1884 |
| Felisito Martinez | Son | — | 10 | ~1930 |
| Katherine Martinez | Daughter | — | 14 | ~1926 |
| Juan Martinez | Head | — | 62 | ~1878 |
Census Appearances
1920
Las Animas, …
Head, age 42
Las Animas, Colorado · implied b. ~1878 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martinez |
| Given Name | Juan |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Colorado |
| Father's Birthplace | United States |
| Mother's Birthplace | New Mexico |
| Occupation | Coal digger |
| Industry | Coal mine |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Las Animas, …
Head, age 52
Las Animas, Colorado · implied b. ~1878 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martinez |
| Given Name | Juan A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Colorado |
| Age at First Marriage | 18 |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Occupation | miner |
| Industry | Coal mine |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 600 |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Las-Animas-County, Colorado
Head, age 62
Las-Animas-County, Colorado · implied b. ~1878 — 4 household members
| Surname | Martinez |
| Given Name | Juan A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 62 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | North Garcia Plaza |
| 1935 Residence (County) | Las Animas |
| Class of Worker | 0 |
| Highest Grade | No 3 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Juan Martinez across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Juan Martinez
Head · 1940 · age 62 · b. ~1878 · Colorado
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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 — Las-Animas-County, Colorado
Open full size
1940 US Federal Census — Las-Animas-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00468-00416)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Jose C. Chavez | 59 | Head | Laborer | New Mexico |
| 2 | Maria Chavez | 50 | Wife | — | New Mexico |
| 3 | Blasina Espinoza | 19 | Step-daughter | Co. Laborer | New Mexico |
| 4 | Jose Espinoza | 15 | Step-son | — | New Mexico |
| 5 | Rosa Espinoza | 10 | Step-daughter | — | New Mexico |
| 6 | Martin Peralta | 43 | Head | House Keeper | Colorado |
| 7 | Jim Peralta | 23 | Son | Co. Laborer | Colorado |
| 8 | Dennis Peralta | 20 | Son | Co. Laborer | Colorado |
| 9 | Joe Peralta | 14 | Son | — | Colorado |
| 10 | Rachel Peralta | 11 | Daughter | — | New Mexico |
| 11 | Juan A. Martinez THIS PERSON | 62 | Head | — | Colorado |
| 12 | Francisca Martinez | 56 | Wife | — | Colorado |
| 13 | Katherine Martinez | 14 | Daughter | — | Colorado |
| 14 | Felisito Martinez | 10 | Son | — | Colorado |
| 15 | Raymond Martinez | 26 | Head | Coal Digger | Colorado |
| 16 | Celina Martinez | 20 | Wife | — | Colorado |
| 17 | Robert T. Martinez | 1 | Son | — | Colorado |
| 18 | Herminio Aragon | 52 | Head | — | Colorado |
| 19 | Florence Aragon | 6 | Adopted Daughter | — | Colorado |
| 20 | Dave Martinez | 35 | Head | Coal Digger | Colorado |
| 21 | Dora Martinez | 31 | Wife | — | Colorado |
| 22 | Stefania Martinez | 10 | Son | — | Colorado |
| 23 | Idela Martinez | 7 | Daughter | — | Colorado |
| 24 | Rita Ann Martinez | 6 | Daughter | — | Colorado |
| 25 | Benina Apodaca | 41 | Head | — | Colorado |
| 26 | Cheney John Apodaca | 19 | Nephew | Co. Laborer | Colorado |
| 27 | Blas Apodaca | 16 | Nephew | — | Colorado |
| 28 | Bacho Castro | 33 | Head | Coal Digger | Mexico |
| 29 | Maria Castro | 30 | Wife | — | Mexico |
| 30 | Rosalia Castro | 14 | Daughter | — | Colorado |
| 31 | Paulita Castro | 12 | Daughter | — | Colorado |
| 32 | Austino Castro | 5 | Son | — | Colorado |
| 33 | Francisco Castro | 2 | Son | — | Colorado |
| 34 | Refailita Castro | 63 | Mother | — | Mexico |
| 35 | Conrado Mascarenas | 44 | Head | Co. Laborer | New Mexico |
| 36 | Escolastica Mascarenas | 38 | Wife | — | New Mexico |
| 37 | John Mascarenas | 16 | Son | — | Colorado |
| 38 | Olivia B. Mascarenas | 13 | Daughter | — | Colorado |
| 39 | Angelina Mascarenas | 10 | Daughter | — | Colorado |
| 40 | Francisca O. Martinez | 65 | Head | — | New Mexico |
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)