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Mary Larsen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · La-Plata-County, Colorado
Our Model Tree links this Mary Larsen across the 1930 and 1940 US Censuses in La-Plata-County, Colorado (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Female
Daughter
Born: Colorado
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | La-Plata-County, Colorado |
| Surname | Larsen |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Tiffany |
| 1935 Residence (County) | La Plata |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Colo. |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Township / Ward | Bayfield Town |
| 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 |
|---|---|---|---|---|
| Albert Larsen | Head | — | 38 | ~1902 |
| Tennis Larsen | Spouse | — | 42 | ~1898 |
| Julia Larsen | Daughter | — | 15 | ~1925 |
| Allene Larsen | Daughter | — | 5 | ~1935 |
| Alberta Larsen | Daughter | — | 13 | ~1927 |
| Alford Larsen | Son | — | 10 | ~1930 |
| Mary Larsen | Daughter | — | 12 | ~1928 |
| Raymond Larsen | Son | — | 8 | ~1932 |
| Johnnie Moore | Other | — | 22 | ~1918 |
Census Appearances
1930
La Plata, …
Daughter, age 1
La Plata, Colorado · implied b. ~1929 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Florida |
| Mother's Birthplace | Georgia |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
La-Plata-County, Colorado
Daughter, age 12
La-Plata-County, Colorado · implied b. ~1928 — 9 household members
| Surname | Larsen |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Colorado |
| 1935 Residence (City) | Tiffany |
| 1935 Residence (County) | La Plata |
| Highest Grade | 6 |
| 1935 Residence | Colo. |
| 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 Mary Larsen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Larsen
Daughter · 1940 · age 12 · b. ~1928 · Colorado
★ You are viewing this record
Sibling
Raymond Larsen
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Allene Larsen
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alford Larsen
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Julia Larsen
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alberta Larsen
Sibling · 1940 · age 13
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 — La-Plata-County, Colorado
Open full size
1940 US Federal Census — La-Plata-County, Colorado
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00466-00839)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Rowland Carmack | 20 | Head | Service Station Operator | Colorado |
| 2 | Hazel Carmack | 20 | Wife | — | Kansas |
| 3 | Wylie Carmack | 4 | Son | — | Colorado |
| 4 | Sondra Carmack | 2 | Daughter | — | Colorado |
| 5 | Lorin Carmack | 21 | Head | Attendant | Colorado |
| 6 | Juanita P. Carmack | 19 | Wife | — | Kansas |
| 8 | James W. Darnall | 63 | Head | Custodian | Colorado |
| 9 | Maude L. Darnall | 59 | Wife | — | Colorado |
| 10 | Lyle A. Devolt | 41 | Head | — | Colorado |
| 11 | Sylvanus Barnes | 68 | Head | Flour Milling | Missouri |
| 12 | Sarah Barnes | 63 | Wife | — | Iowa |
| 13 | Paul Barnes | 43 | Son | Miller | Colorado |
| 14 | Arval Mccoy | 23 | Head | Rodman | Colorado |
| 15 | Mae A. Mccoy | 20 | Wife | — | New Mex |
| 16 | Emil Luthi | 35 | Head | Skilled Laborer | Kansas |
| 17 | Eliza W. Luthi | 27 | Wife | — | Colorado |
| 18 | Emil W. Jr. Luthi | 3 | Son | — | Kansas |
| 19 | Robert E. Luthi | 2 | Son | — | Colorado |
| 20 | Mary Mae Luthi | 0 | Daughter | — | Colorado |
| 21 | Robert C. Morris | 33 | Head | Salesman | Colorado |
| 22 | Vola Morris | 27 | Wife | — | Montana |
| 23 | Robert C. Jr. Morris | 2 | Son | — | Colorado |
| 24 | Robert G. Morris | 82 | Father | — | Ohio |
| 25 | Joseph C. Weber | 28 | Head | Instructor | Iowa |
| 26 | Evelyn B. Weber | 20 | Wife | — | Colorado |
| 27 | Barbara Weber | 4 | Daughter | — | Colorado |
| 28 | Mary Weber | 3 | Daughter | — | Colorado |
| 29 | Margaret Weber | 2 | Daughter | — | Colorado |
| 31 | Albert L. Larsen | 38 | Head | Carpenter | Colorado |
| 32 | Tennis L. Larsen | 42 | Wife | — | Texas |
| 33 | Julia Alice Larsen | 15 | Daughter | — | New Mex |
| 34 | Alberta L. Larsen | 13 | Daughter | — | New Mex |
| 35 | Mary E. Larsen THIS PERSON | 12 | Daughter | — | Colorado |
| 36 | Alford L. Larsen | 10 | Son | — | Colorado |
| 37 | Raymond Larsen | 8 | Son | — | Colorado |
| 38 | Allene J. Larsen | 5 | Daughter | — | Colorado |
| 39 | Johnnie Moore | 22 | Lodger | Carpenter | Kansas |
| 40 | Robert Bolin | 22 | Head | Carpenter | Kansas |
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)